Merge branch 'issue-discussions-refactor' into 'master'

Issue discussions Vue refactor

See merge request !12069

78 files changed, 3105 insertions, 156 deletions

diff --git a/app/assets/javascripts/autosave.js b/app/assets/javascripts/autosave.js
index cfab6c40b34..4d2d4db7c0e 100644
--- a/app/assets/javascripts/autosave.js
+++ b/app/assets/javascripts/autosave.js
@@ -2,17 +2,17 @@
 import AccessorUtilities from './lib/utils/accessor';
 
 window.Autosave = (function() {
-  function Autosave(field, key) {
+  function Autosave(field, key, resource) {
     this.field = field;
     this.isLocalStorageAvailable = AccessorUtilities.isLocalStorageAccessSafe();
-
+    this.resource = resource;
     if (key.join != null) {
-      key = key.join("/");
+      key = key.join('/');
     }
-    this.key = "autosave/" + key;
-    this.field.data("autosave", this);
+    this.key = 'autosave/' + key;
+    this.field.data('autosave', this);
     this.restore();
-    this.field.on("input", (function(_this) {
+    this.field.on('input', (function(_this) {
       return function() {
         return _this.save();
       };
@@ -29,7 +29,17 @@ window.Autosave = (function() {
     if ((text != null ? text.length : void 0) > 0) {
       this.field.val(text);
     }
-    return this.field.trigger("input");
+    if (!this.resource && this.resource !== 'issue') {
+      this.field.trigger('input');
+    } else {
+      // v-model does not update with jQuery trigger
+      // https://github.com/vuejs/vue/issues/2804#issuecomment-216968137
+      const event = new Event('change', { bubbles: true, cancelable: false });
+      const field = this.field.get(0);
+      if (field) {
+        field.dispatchEvent(event);
+      }
+    }
   };
 
   Autosave.prototype.save = function() {
diff --git a/app/assets/javascripts/awards_handler.js b/app/assets/javascripts/awards_handler.js
index 097f79a250a..22fa1f2a609 100644
--- a/app/assets/javascripts/awards_handler.js
+++ b/app/assets/javascripts/awards_handler.js
@@ -109,6 +109,7 @@ class AwardsHandler {
     }
 
     $thumbsBtn.toggleClass('disabled', $userAuthored);
+    $thumbsBtn.prop('disabled', $userAuthored);
   }
 
   // Create the emoji menu with the first category of emojis.
@@ -234,14 +235,33 @@ class AwardsHandler {
   }
 
   addAward(votesBlock, awardUrl, emoji, checkMutuality, callback) {
+    const isMainAwardsBlock = votesBlock.closest('.js-issue-note-awards').length;
+
+    if (gl.utils.isInIssuePage() && !isMainAwardsBlock) {
+      const id = votesBlock.attr('id').replace('note_', '');
+
+      $('.emoji-menu').removeClass('is-visible');
+      $('.js-add-award.is-active').removeClass('is-active');
+      const toggleAwardEvent = new CustomEvent('toggleAward', {
+        detail: {
+          awardName: emoji,
+          noteId: id,
+        },
+      });
+
+      document.querySelector('.js-vue-notes-event').dispatchEvent(toggleAwardEvent);
+    }
+
     const normalizedEmoji = this.emoji.normalizeEmojiName(emoji);
     const $emojiButton = this.findEmojiIcon(votesBlock, normalizedEmoji).parent();
+
     this.postEmoji($emojiButton, awardUrl, normalizedEmoji, () => {
       this.addAwardToEmojiBar(votesBlock, normalizedEmoji, checkMutuality);
       return typeof callback === 'function' ? callback() : undefined;
     });
+
     $('.emoji-menu').removeClass('is-visible');
-    $('.js-add-award.is-active').removeClass('is-active');
+    return $('.js-add-award.is-active').removeClass('is-active');
   }
 
   addAwardToEmojiBar(votesBlock, emoji, checkForMutuality) {
@@ -268,6 +288,14 @@ class AwardsHandler {
   }
 
   getVotesBlock() {
+    if (gl.utils.isInIssuePage()) {
+      const $el = $('.js-add-award.is-active').closest('.note.timeline-entry');
+
+      if ($el.length) {
+        return $el;
+      }
+    }
+
     const currentBlock = $('.js-awards-block.current');
     let resultantVotesBlock = currentBlock;
     if (currentBlock.length === 0) {
diff --git a/app/assets/javascripts/behaviors/quick_submit.js b/app/assets/javascripts/behaviors/quick_submit.js
index bc693616460..79702c54852 100644
--- a/app/assets/javascripts/behaviors/quick_submit.js
+++ b/app/assets/javascripts/behaviors/quick_submit.js
@@ -44,7 +44,10 @@ $(document).on('keydown.quick_submit', '.js-quick-submit', (e) => {
 
   if (!$submitButton.attr('disabled')) {
     $submitButton.trigger('click', [e]);
-    $submitButton.disable();
+
+    if (!gl.utils.isInIssuePage()) {
+      $submitButton.disable();
+    }
   }
 });
 
diff --git a/app/assets/javascripts/dispatcher.js b/app/assets/javascripts/dispatcher.js
index c70a17104fd..3dec4de06ec 100644
--- a/app/assets/javascripts/dispatcher.js
+++ b/app/assets/javascripts/dispatcher.js
@@ -99,7 +99,7 @@ import initChangesDropdown from './init_changes_dropdown';
       path = page.split(':');
       shortcut_handler = null;
 
-      $('.js-gfm-input').each((i, el) => {
+      $('.js-gfm-input:not(.js-vue-textarea)').each((i, el) => {
         const gfm = new GfmAutoComplete(gl.GfmAutoComplete && gl.GfmAutoComplete.dataSources);
         const enableGFM = gl.utils.convertPermissionToBoolean(el.dataset.supportsAutocomplete);
         gfm.setup($(el), {
@@ -172,7 +172,6 @@ import initChangesDropdown from './init_changes_dropdown';
           shortcut_handler = new ShortcutsIssuable();
           new ZenMode();
           initIssuableSidebar();
-          initNotes();
           break;
         case 'dashboard:milestones:index':
           new ProjectSelect();
diff --git a/app/assets/javascripts/dropzone_input.js b/app/assets/javascripts/dropzone_input.js
index 6d19a6d9b3a..975903159be 100644
--- a/app/assets/javascripts/dropzone_input.js
+++ b/app/assets/javascripts/dropzone_input.js
@@ -128,7 +128,7 @@ window.DropzoneInput = (function() {
     // removeAllFiles(true) stops uploading files (if any)
     // and remove them from dropzone files queue.
     $cancelButton.on('click', (e) => {
-      const target = e.target.closest('form').querySelector('.div-dropzone');
+      const target = e.target.closest('.js-main-target-form').querySelector('.div-dropzone');
 
       e.preventDefault();
       e.stopPropagation();
@@ -140,7 +140,7 @@ window.DropzoneInput = (function() {
     // and add that files to the dropzone files queue again.
     // addFile() adds file to dropzone files queue and upload it.
     $retryLink.on('click', (e) => {
-      const dropzoneInstance = Dropzone.forElement(e.target.closest('form').querySelector('.div-dropzone'));
+      const dropzoneInstance = Dropzone.forElement(e.target.closest('.js-main-target-form').querySelector('.div-dropzone'));
       const failedFiles = dropzoneInstance.files;
 
       e.preventDefault();
diff --git a/app/assets/javascripts/issue.js b/app/assets/javascripts/issue.js
index 2bee4fb045a..7c4f4da6127 100644
--- a/app/assets/javascripts/issue.js
+++ b/app/assets/javascripts/issue.js
@@ -42,7 +42,7 @@ class Issue {
   initIssueBtnEventListeners() {
     const issueFailMessage = 'Unable to update this issue at this time.';
 
-    return $(document).on('click', 'a.btn-close, a.btn-reopen', (e) => {
+    return $(document).on('click', '.js-issuable-actions a.btn-close, .js-issuable-actions a.btn-reopen', (e) => {
       var $button, shouldSubmit, url;
       e.preventDefault();
       e.stopImmediatePropagation();
@@ -66,12 +66,11 @@ class Issue {
         const projectIssuesCounter = $('.issue_counter');
 
         if ('id' in data) {
-          $(document).trigger('issuable:change');
-
           const isClosed = $button.hasClass('btn-close');
           isClosedBadge.toggleClass('hidden', !isClosed);
           isOpenBadge.toggleClass('hidden', isClosed);
 
+          $(document).trigger('issuable:change', isClosed);
           this.toggleCloseReopenButton(isClosed);
 
           let numProjectIssues = Number(projectIssuesCounter.text().replace(/[^\d]/, ''));
@@ -121,7 +120,7 @@ class Issue {
   static submitNoteForm(form) {
     var noteText;
     noteText = form.find("textarea.js-note-text").val();
-    if (noteText.trim().length > 0) {
+    if (noteText && noteText.trim().length > 0) {
       return form.submit();
     }
   }
diff --git a/app/assets/javascripts/issue_show/components/app.vue b/app/assets/javascripts/issue_show/components/app.vue
index efae112923d..eaaafd4c149 100644
--- a/app/assets/javascripts/issue_show/components/app.vue
+++ b/app/assets/javascripts/issue_show/components/app.vue
@@ -80,11 +80,11 @@ export default {
       type: Boolean,
       required: true,
     },
-    markdownPreviewUrl: {
+    markdownPreviewPath: {
       type: String,
       required: true,
     },
-    markdownDocs: {
+    markdownDocsPath: {
       type: String,
       required: true,
     },
@@ -96,7 +96,7 @@ export default {
       type: String,
       required: true,
     },
-    projectsAutocompleteUrl: {
+    projectsAutocompletePath: {
       type: String,
       required: true,
     },
@@ -242,11 +242,11 @@ export default {
       :can-move="canMove"
       :can-destroy="canDestroy"
       :issuable-templates="issuableTemplates"
-      :markdown-docs="markdownDocs"
-      :markdown-preview-url="markdownPreviewUrl"
+      :markdown-docs-path="markdownDocsPath"
+      :markdown-preview-path="markdownPreviewPath"
       :project-path="projectPath"
       :project-namespace="projectNamespace"
-      :projects-autocomplete-url="projectsAutocompleteUrl"
+      :projects-autocomplete-path="projectsAutocompletePath"
     />
     <div v-else>
       <title-component
diff --git a/app/assets/javascripts/issue_show/components/fields/description.vue b/app/assets/javascripts/issue_show/components/fields/description.vue
index 27b1b814f9a..dc902eefc5f 100644
--- a/app/assets/javascripts/issue_show/components/fields/description.vue
+++ b/app/assets/javascripts/issue_show/components/fields/description.vue
@@ -10,11 +10,11 @@
         type: Object,
         required: true,
       },
-      markdownPreviewUrl: {
+      markdownPreviewPath: {
         type: String,
         required: true,
       },
-      markdownDocs: {
+      markdownDocsPath: {
         type: String,
         required: true,
       },
@@ -36,8 +36,8 @@
       Description
     </label>
     <markdown-field
-      :markdown-preview-url="markdownPreviewUrl"
-      :markdown-docs="markdownDocs">
+      :markdown-preview-path="markdownPreviewPath"
+      :markdown-docs-path="markdownDocsPath">
       <textarea
         id="issue-description"
         class="note-textarea js-gfm-input js-autosize markdown-area"
diff --git a/app/assets/javascripts/issue_show/components/fields/project_move.vue b/app/assets/javascripts/issue_show/components/fields/project_move.vue
index 7bf2be8b28a..e514bebc5f6 100644
--- a/app/assets/javascripts/issue_show/components/fields/project_move.vue
+++ b/app/assets/javascripts/issue_show/components/fields/project_move.vue
@@ -10,7 +10,7 @@
         type: Object,
         required: true,
       },
-      projectsAutocompleteUrl: {
+      projectsAutocompletePath: {
         type: String,
         required: true,
       },
@@ -20,7 +20,7 @@
 
       $moveDropdown.select2({
         ajax: {
-          url: this.projectsAutocompleteUrl,
+          url: this.projectsAutocompletePath,
           quietMillis: 125,
           data(term, page, context) {
             return {
diff --git a/app/assets/javascripts/issue_show/components/form.vue b/app/assets/javascripts/issue_show/components/form.vue
index 76ec3dc9a5d..d9b53bc55cf 100644
--- a/app/assets/javascripts/issue_show/components/form.vue
+++ b/app/assets/javascripts/issue_show/components/form.vue
@@ -26,11 +26,11 @@
         required: false,
         default: () => [],
       },
-      markdownPreviewUrl: {
+      markdownPreviewPath: {
         type: String,
         required: true,
       },
-      markdownDocs: {
+      markdownDocsPath: {
         type: String,
         required: true,
       },
@@ -42,7 +42,7 @@
         type: String,
         required: true,
       },
-      projectsAutocompleteUrl: {
+      projectsAutocompletePath: {
         type: String,
         required: true,
       },
@@ -89,14 +89,14 @@
     </div>
     <description-field
       :form-state="formState"
-      :markdown-preview-url="markdownPreviewUrl"
-      :markdown-docs="markdownDocs" />
+      :markdown-preview-path="markdownPreviewPath"
+      :markdown-docs-path="markdownDocsPath" />
     <confidential-checkbox
       :form-state="formState" />
     <project-move
       v-if="canMove"
       :form-state="formState"
-      :projects-autocomplete-url="projectsAutocompleteUrl" />
+      :projects-autocomplete-path="projectsAutocompletePath" />
     <edit-actions
       :form-state="formState"
       :can-destroy="canDestroy" />
diff --git a/app/assets/javascripts/issue_show/index.js b/app/assets/javascripts/issue_show/index.js
index ad8cb6465e2..60b69b300fd 100644
--- a/app/assets/javascripts/issue_show/index.js
+++ b/app/assets/javascripts/issue_show/index.js
@@ -37,11 +37,11 @@ document.addEventListener('DOMContentLoaded', () => {
           initialDescriptionText: this.initialDescriptionText,
           issuableTemplates: this.issuableTemplates,
           isConfidential: this.isConfidential,
-          markdownPreviewUrl: this.markdownPreviewUrl,
-          markdownDocs: this.markdownDocs,
+          markdownPreviewPath: this.markdownPreviewPath,
+          markdownDocsPath: this.markdownDocsPath,
           projectPath: this.projectPath,
           projectNamespace: this.projectNamespace,
-          projectsAutocompleteUrl: this.projectsAutocompleteUrl,
+          projectsAutocompletePath: this.projectsAutocompletePath,
           updatedAt: this.updatedAt,
           updatedByName: this.updatedByName,
           updatedByPath: this.updatedByPath,
diff --git a/app/assets/javascripts/lib/utils/common_utils.js b/app/assets/javascripts/lib/utils/common_utils.js
index b8f4f4eaba3..b8bebe1894f 100644
--- a/app/assets/javascripts/lib/utils/common_utils.js
+++ b/app/assets/javascripts/lib/utils/common_utils.js
@@ -27,6 +27,13 @@
       }
     };
 
+    w.gl.utils.isInIssuePage = () => {
+      const page = gl.utils.getPagePath(1);
+      const action = gl.utils.getPagePath(2);
+
+      return page === 'issues' && action === 'show';
+    };
+
     w.gl.utils.ajaxGet = function(url) {
       return $.ajax({
         type: "GET",
@@ -167,11 +174,12 @@
     };
 
     gl.utils.scrollToElement = function($el) {
-      var top = $el.offset().top;
-      gl.mrTabsHeight = gl.mrTabsHeight || $('.merge-request-tabs').height();
+      const top = $el.offset().top;
+      const mrTabsHeight = $('.merge-request-tabs').height() || 0;
+      const headerHeight = $('.navbar-gitlab').height() || 0;
 
       return $('body, html').animate({
-        scrollTop: top - (gl.mrTabsHeight)
+        scrollTop: top - mrTabsHeight - headerHeight,
       }, 200);
     };
 
diff --git a/app/assets/javascripts/notes/components/issue_comment_form.vue b/app/assets/javascripts/notes/components/issue_comment_form.vue
new file mode 100644
index 00000000000..16f4e22aa9b
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_comment_form.vue
@@ -0,0 +1,347 @@
+<script>
+  /* global Flash, Autosave */
+  import { mapActions, mapGetters } from 'vuex';
+  import _ from 'underscore';
+  import '../../autosave';
+  import TaskList from '../../task_list';
+  import * as constants from '../constants';
+  import eventHub from '../event_hub';
+  import confidentialIssue from '../../vue_shared/components/issue/confidential_issue_warning.vue';
+  import issueNoteSignedOutWidget from './issue_note_signed_out_widget.vue';
+  import markdownField from '../../vue_shared/components/markdown/field.vue';
+  import userAvatarLink from '../../vue_shared/components/user_avatar/user_avatar_link.vue';
+
+  export default {
+    name: 'issueCommentForm',
+    data() {
+      return {
+        note: '',
+        noteType: constants.COMMENT,
+        // Can't use mapGetters,
+        // this needs to be in the data object because it belongs to the state
+        issueState: this.$store.getters.getIssueData.state,
+        isSubmitting: false,
+        isSubmitButtonDisabled: true,
+      };
+    },
+    components: {
+      confidentialIssue,
+      issueNoteSignedOutWidget,
+      markdownField,
+      userAvatarLink,
+    },
+    watch: {
+      note(newNote) {
+        this.setIsSubmitButtonDisabled(newNote, this.isSubmitting);
+      },
+      isSubmitting(newValue) {
+        this.setIsSubmitButtonDisabled(this.note, newValue);
+      },
+    },
+    computed: {
+      ...mapGetters([
+        'getCurrentUserLastNote',
+        'getUserData',
+        'getIssueData',
+        'getNotesData',
+      ]),
+      isLoggedIn() {
+        return this.getUserData.id;
+      },
+      commentButtonTitle() {
+        return this.noteType === constants.COMMENT ? 'Comment' : 'Start discussion';
+      },
+      isIssueOpen() {
+        return this.issueState === constants.OPENED || this.issueState === constants.REOPENED;
+      },
+      issueActionButtonTitle() {
+        if (this.note.length) {
+          const actionText = this.isIssueOpen ? 'close' : 'reopen';
+
+          return this.noteType === constants.COMMENT ? `Comment & ${actionText} issue` : `Start discussion & ${actionText} issue`;
+        }
+
+        return this.isIssueOpen ? 'Close issue' : 'Reopen issue';
+      },
+      actionButtonClassNames() {
+        return {
+          'btn-reopen': !this.isIssueOpen,
+          'btn-close': this.isIssueOpen,
+          'js-note-target-close': this.isIssueOpen,
+          'js-note-target-reopen': !this.isIssueOpen,
+        };
+      },
+      markdownDocsPath() {
+        return this.getNotesData.markdownDocsPath;
+      },
+      quickActionsDocsPath() {
+        return this.getNotesData.quickActionsDocsPath;
+      },
+      markdownPreviewPath() {
+        return this.getIssueData.preview_note_path;
+      },
+      author() {
+        return this.getUserData;
+      },
+      canUpdateIssue() {
+        return this.getIssueData.current_user.can_update;
+      },
+      endpoint() {
+        return this.getIssueData.create_note_path;
+      },
+      isConfidentialIssue() {
+        return this.getIssueData.confidential;
+      },
+    },
+    methods: {
+      ...mapActions([
+        'saveNote',
+        'removePlaceholderNotes',
+      ]),
+      setIsSubmitButtonDisabled(note, isSubmitting) {
+        if (!_.isEmpty(note) && !isSubmitting) {
+          this.isSubmitButtonDisabled = false;
+        } else {
+          this.isSubmitButtonDisabled = true;
+        }
+      },
+      handleSave(withIssueAction) {
+        if (this.note.length) {
+          const noteData = {
+            endpoint: this.endpoint,
+            flashContainer: this.$el,
+            data: {
+              note: {
+                noteable_type: constants.NOTEABLE_TYPE,
+                noteable_id: this.getIssueData.id,
+                note: this.note,
+              },
+            },
+          };
+
+          if (this.noteType === constants.DISCUSSION) {
+            noteData.data.note.type = constants.DISCUSSION_NOTE;
+          }
+          this.isSubmitting = true;
+          this.note = ''; // Empty textarea while being requested. Repopulate in catch
+
+          this.saveNote(noteData)
+            .then((res) => {
+              this.isSubmitting = false;
+              if (res.errors) {
+                if (res.errors.commands_only) {
+                  this.discard();
+                } else {
+                  Flash(
+                    'Something went wrong while adding your comment. Please try again.',
+                    'alert',
+                    $(this.$refs.commentForm),
+                  );
+                }
+              } else {
+                this.discard();
+              }
+
+              if (withIssueAction) {
+                this.toggleIssueState();
+              }
+            })
+            .catch(() => {
+              this.isSubmitting = false;
+              this.discard(false);
+              const msg = 'Your comment could not be submitted! Please check your network connection and try again.';
+              Flash(msg, 'alert', $(this.$el));
+              this.note = noteData.data.note.note; // Restore textarea content.
+              this.removePlaceholderNotes();
+            });
+        } else {
+          this.toggleIssueState();
+        }
+      },
+      toggleIssueState() {
+        this.issueState = this.isIssueOpen ? constants.CLOSED : constants.REOPENED;
+
+        // This is out of scope for the Notes Vue component.
+        // It was the shortest path to update the issue state and relevant places.
+        const btnClass = this.isIssueOpen ? 'btn-reopen' : 'btn-close';
+        $(`.js-btn-issue-action.${btnClass}:visible`).trigger('click');
+      },
+      discard(shouldClear = true) {
+        // `blur` is needed to clear slash commands autocomplete cache if event fired.
+        // `focus` is needed to remain cursor in the textarea.
+        this.$refs.textarea.blur();
+        this.$refs.textarea.focus();
+
+        if (shouldClear) {
+          this.note = '';
+        }
+
+        // reset autostave
+        this.autosave.reset();
+      },
+      setNoteType(type) {
+        this.noteType = type;
+      },
+      editCurrentUserLastNote() {
+        if (this.note === '') {
+          const lastNote = this.getCurrentUserLastNote;
+
+          if (lastNote) {
+            eventHub.$emit('enterEditMode', {
+              noteId: lastNote.id,
+            });
+          }
+        }
+      },
+      initAutoSave() {
+        if (this.isLoggedIn) {
+          this.autosave = new Autosave($(this.$refs.textarea), ['Note', 'Issue', this.getIssueData.id], 'issue');
+        }
+      },
+      initTaskList() {
+        return new TaskList({
+          dataType: 'note',
+          fieldName: 'note',
+          selector: '.notes',
+        });
+      },
+    },
+    mounted() {
+      // jQuery is needed here because it is a custom event being dispatched with jQuery.
+      $(document).on('issuable:change', (e, isClosed) => {
+        this.issueState = isClosed ? constants.CLOSED : constants.REOPENED;
+      });
+
+      this.initAutoSave();
+      this.initTaskList();
+    },
+  };
+</script>
+
+<template>
+  <div>
+    <issue-note-signed-out-widget v-if="!isLoggedIn" />
+    <ul
+      v-else
+      class="notes notes-form timeline">
+      <li class="timeline-entry">
+        <div class="timeline-entry-inner">
+          <div class="flash-container error-alert timeline-content"></div>
+          <div class="timeline-icon hidden-xs hidden-sm">
+            <user-avatar-link
+              v-if="author"
+              :link-href="author.path"
+              :img-src="author.avatar_url"
+              :img-alt="author.name"
+              :img-size="40"
+              />
+          </div>
+          <div class="timeline-content timeline-content-form">
+            <form
+              ref="commentForm"
+              class="new-note js-quick-submit common-note-form gfm-form js-main-target-form">
+              <confidentialIssue v-if="isConfidentialIssue" />
+              <div class="error-alert"></div>
+              <markdown-field
+                :markdown-preview-path="markdownPreviewPath"
+                :markdown-docs-path="markdownDocsPath"
+                :quick-actions-docs-path="quickActionsDocsPath"
+                :add-spacing-classes="false"
+                :is-confidential-issue="isConfidentialIssue">
+                <textarea
+                  id="note-body"
+                  name="note[note]"
+                  class="note-textarea js-vue-comment-form js-gfm-input js-autosize markdown-area js-vue-textarea"
+                  data-supports-quick-actions="true"
+                  aria-label="Description"
+                  v-model="note"
+                  ref="textarea"
+                  slot="textarea"
+                  placeholder="Write a comment or drag your files here..."
+                  @keydown.up="editCurrentUserLastNote()"
+                  @keydown.meta.enter="handleSave()">
+                </textarea>
+              </markdown-field>
+              <div class="note-form-actions">
+                <div class="pull-left btn-group append-right-10 comment-type-dropdown js-comment-type-dropdown droplab-dropdown">
+                  <button
+                    @click.prevent="handleSave()"
+                    :disabled="isSubmitButtonDisabled"
+                    class="btn btn-create comment-btn js-comment-button js-comment-submit-button"
+                    type="submit">
+                    {{commentButtonTitle}}
+                  </button>
+                  <button
+                    :disabled="isSubmitButtonDisabled"
+                    name="button"
+                    type="button"
+                    class="btn comment-btn note-type-toggle js-note-new-discussion dropdown-toggle"
+                    data-toggle="dropdown"
+                    aria-label="Open comment type dropdown">
+                    <i
+                      aria-hidden="true"
+                      class="fa fa-caret-down toggle-icon">
+                    </i>
+                  </button>
+
+                  <ul class="note-type-dropdown dropdown-open-top dropdown-menu">
+                    <li :class="{ 'droplab-item-selected': noteType === 'comment' }">
+                      <button
+                        type="button"
+                        class="btn btn-transparent"
+                        @click.prevent="setNoteType('comment')">
+                        <i
+                          aria-hidden="true"
+                          class="fa fa-check icon">
+                        </i>
+                        <div class="description">
+                          <strong>Comment</strong>
+                          <p>
+                            Add a general comment to this issue.
+                          </p>
+                        </div>
+                      </button>
+                    </li>
+                    <li class="divider droplab-item-ignore"></li>
+                    <li :class="{ 'droplab-item-selected': noteType === 'discussion' }">
+                      <button
+                        type="button"
+                        class="btn btn-transparent"
+                        @click.prevent="setNoteType('discussion')">
+                        <i
+                          aria-hidden="true"
+                          class="fa fa-check icon">
+                          </i>
+                        <div class="description">
+                          <strong>Start discussion</strong>
+                          <p>
+                            Discuss a specific suggestion or question.
+                          </p>
+                        </div>
+                      </button>
+                    </li>
+                  </ul>
+                </div>
+                <button
+                  type="button"
+                  @click="handleSave(true)"
+                  v-if="canUpdateIssue"
+                  :class="actionButtonClassNames"
+                  class="btn btn-comment btn-comment-and-close">
+                  {{issueActionButtonTitle}}
+                </button>
+                <button
+                  type="button"
+                  v-if="note.length"
+                  @click="discard"
+                  class="btn btn-cancel js-note-discard">
+                  Discard draft
+                </button>
+              </div>
+            </form>
+          </div>
+        </div>
+      </li>
+    </ul>
+  </div>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_discussion.vue b/app/assets/javascripts/notes/components/issue_discussion.vue
new file mode 100644
index 00000000000..b131ef4b182
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_discussion.vue
@@ -0,0 +1,232 @@
+<script>
+  /* global Flash */
+  import { mapActions, mapGetters } from 'vuex';
+  import { SYSTEM_NOTE } from '../constants';
+  import issueNote from './issue_note.vue';
+  import userAvatarLink from '../../vue_shared/components/user_avatar/user_avatar_link.vue';
+  import issueNoteHeader from './issue_note_header.vue';
+  import issueNoteActions from './issue_note_actions.vue';
+  import issueNoteSignedOutWidget from './issue_note_signed_out_widget.vue';
+  import issueNoteEditedText from './issue_note_edited_text.vue';
+  import issueNoteForm from './issue_note_form.vue';
+  import placeholderNote from './issue_placeholder_note.vue';
+  import placeholderSystemNote from './issue_placeholder_system_note.vue';
+  import autosave from '../mixins/autosave';
+
+  export default {
+    props: {
+      note: {
+        type: Object,
+        required: true,
+      },
+    },
+    data() {
+      return {
+        isReplying: false,
+      };
+    },
+    components: {
+      issueNote,
+      userAvatarLink,
+      issueNoteHeader,
+      issueNoteActions,
+      issueNoteSignedOutWidget,
+      issueNoteEditedText,
+      issueNoteForm,
+      placeholderNote,
+      placeholderSystemNote,
+    },
+    mixins: [
+      autosave,
+    ],
+    computed: {
+      ...mapGetters([
+        'getIssueData',
+      ]),
+      discussion() {
+        return this.note.notes[0];
+      },
+      author() {
+        return this.discussion.author;
+      },
+      canReply() {
+        return this.getIssueData.current_user.can_create_note;
+      },
+      newNotePath() {
+        return this.getIssueData.create_note_path;
+      },
+      lastUpdatedBy() {
+        const { notes } = this.note;
+
+        if (notes.length > 1) {
+          return notes[notes.length - 1].author;
+        }
+
+        return null;
+      },
+      lastUpdatedAt() {
+        const { notes } = this.note;
+
+        if (notes.length > 1) {
+          return notes[notes.length - 1].created_at;
+        }
+
+        return null;
+      },
+    },
+    methods: {
+      ...mapActions([
+        'saveNote',
+        'toggleDiscussion',
+        'removePlaceholderNotes',
+      ]),
+      componentName(note) {
+        if (note.isPlaceholderNote) {
+          if (note.placeholderType === SYSTEM_NOTE) {
+            return placeholderSystemNote;
+          }
+          return placeholderNote;
+        }
+
+        return issueNote;
+      },
+      componentData(note) {
+        return note.isPlaceholderNote ? note.notes[0] : note;
+      },
+      toggleDiscussionHandler() {
+        this.toggleDiscussion({ discussionId: this.note.id });
+      },
+      showReplyForm() {
+        this.isReplying = true;
+      },
+      cancelReplyForm(shouldConfirm) {
+        if (shouldConfirm && this.$refs.noteForm.isDirty) {
+          // eslint-disable-next-line no-alert
+          if (!confirm('Are you sure you want to cancel creating this comment?')) {
+            return;
+          }
+        }
+
+        this.resetAutoSave();
+        this.isReplying = false;
+      },
+      saveReply(noteText, form, callback) {
+        const replyData = {
+          endpoint: this.newNotePath,
+          flashContainer: this.$el,
+          data: {
+            in_reply_to_discussion_id: this.note.reply_id,
+            target_type: 'issue',
+            target_id: this.discussion.noteable_id,
+            note: { note: noteText },
+          },
+        };
+        this.isReplying = false;
+
+        this.saveNote(replyData)
+          .then(() => {
+            this.resetAutoSave();
+            callback();
+          })
+          .catch((err) => {
+            this.removePlaceholderNotes();
+            this.isReplying = true;
+            this.$nextTick(() => {
+              const msg = 'Your comment could not be submitted! Please check your network connection and try again.';
+              Flash(msg, 'alert', $(this.$el));
+              this.$refs.noteForm.note = noteText;
+              callback(err);
+            });
+          });
+      },
+    },
+    mounted() {
+      if (this.isReplying) {
+        this.initAutoSave();
+      }
+    },
+    updated() {
+      if (this.isReplying) {
+        if (!this.autosave) {
+          this.initAutoSave();
+        } else {
+          this.setAutoSave();
+        }
+      }
+    },
+  };
+</script>
+
+<template>
+  <li class="note note-discussion timeline-entry">
+    <div class="timeline-entry-inner">
+      <div class="timeline-icon">
+        <user-avatar-link
+          :link-href="author.path"
+          :img-src="author.avatar_url"
+          :img-alt="author.name"
+          :img-size="40"
+          />
+      </div>
+      <div class="timeline-content">
+        <div class="discussion">
+          <div class="discussion-header">
+            <issue-note-header
+              :author="author"
+              :created-at="discussion.created_at"
+              :note-id="discussion.id"
+              :include-toggle="true"
+              @toggleHandler="toggleDiscussionHandler"
+              action-text="started a discussion"
+              class="discussion"
+              />
+            <issue-note-edited-text
+              v-if="lastUpdatedAt"
+              :edited-at="lastUpdatedAt"
+              :edited-by="lastUpdatedBy"
+              action-text="Last updated"
+              class-name="discussion-headline-light js-discussion-headline"
+              />
+            </div>
+          </div>
+          <div
+            v-if="note.expanded"
+            class="discussion-body">
+            <div class="panel panel-default">
+              <div class="discussion-notes">
+                <ul class="notes">
+                  <component
+                    v-for="note in note.notes"
+                    :is="componentName(note)"
+                    :note="componentData(note)"
+                    :key="note.id"
+                    />
+                </ul>
+                <div
+                  :class="{ 'is-replying': isReplying }"
+                  class="discussion-reply-holder">
+                  <button
+                    v-if="canReply && !isReplying"
+                    @click="showReplyForm"
+                    type="button"
+                    class="js-vue-discussion-reply btn btn-text-field"
+                    title="Add a reply">Reply...</button>
+                  <issue-note-form
+                    v-if="isReplying"
+                    save-button-title="Comment"
+                    :discussion="note"
+                    :is-editing="false"
+                    @handleFormUpdate="saveReply"
+                    @cancelFormEdition="cancelReplyForm"
+                    ref="noteForm"
+                    />
+                  <issue-note-signed-out-widget v-if="!canReply" />
+                </div>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  </li>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_note.vue b/app/assets/javascripts/notes/components/issue_note.vue
new file mode 100644
index 00000000000..3483f6c7538
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_note.vue
@@ -0,0 +1,186 @@
+<script>
+  /* global Flash */
+
+  import { mapGetters, mapActions } from 'vuex';
+  import userAvatarLink from '../../vue_shared/components/user_avatar/user_avatar_link.vue';
+  import issueNoteHeader from './issue_note_header.vue';
+  import issueNoteActions from './issue_note_actions.vue';
+  import issueNoteBody from './issue_note_body.vue';
+  import eventHub from '../event_hub';
+
+  export default {
+    props: {
+      note: {
+        type: Object,
+        required: true,
+      },
+    },
+    data() {
+      return {
+        isEditing: false,
+        isDeleting: false,
+        isRequesting: false,
+      };
+    },
+    components: {
+      userAvatarLink,
+      issueNoteHeader,
+      issueNoteActions,
+      issueNoteBody,
+    },
+    computed: {
+      ...mapGetters([
+        'targetNoteHash',
+        'getUserData',
+      ]),
+      author() {
+        return this.note.author;
+      },
+      classNameBindings() {
+        return {
+          'is-editing': this.isEditing && !this.isRequesting,
+          'is-requesting being-posted': this.isRequesting,
+          'disabled-content': this.isDeleting,
+          target: this.targetNoteHash === this.noteAnchorId,
+        };
+      },
+      canReportAsAbuse() {
+        return this.note.report_abuse_path && this.author.id !== this.getUserData.id;
+      },
+      noteAnchorId() {
+        return `note_${this.note.id}`;
+      },
+    },
+    methods: {
+      ...mapActions([
+        'deleteNote',
+        'updateNote',
+        'scrollToNoteIfNeeded',
+      ]),
+      editHandler() {
+        this.isEditing = true;
+      },
+      deleteHandler() {
+        // eslint-disable-next-line no-alert
+        if (confirm('Are you sure you want to delete this list?')) {
+          this.isDeleting = true;
+
+          this.deleteNote(this.note)
+            .then(() => {
+              this.isDeleting = false;
+            })
+            .catch(() => {
+              Flash('Something went wrong while deleting your note. Please try again.');
+              this.isDeleting = false;
+            });
+        }
+      },
+      formUpdateHandler(noteText, parentElement, callback) {
+        const data = {
+          endpoint: this.note.path,
+          note: {
+            target_type: 'issue',
+            target_id: this.note.noteable_id,
+            note: { note: noteText },
+          },
+        };
+        this.isRequesting = true;
+        this.oldContent = this.note.note_html;
+        this.note.note_html = noteText;
+
+        this.updateNote(data)
+          .then(() => {
+            this.isEditing = false;
+            this.isRequesting = false;
+            $(this.$refs.noteBody.$el).renderGFM();
+            this.$refs.noteBody.resetAutoSave();
+            callback();
+          })
+          .catch(() => {
+            this.isRequesting = false;
+            this.isEditing = true;
+            this.$nextTick(() => {
+              const msg = 'Something went wrong while editing your comment. Please try again.';
+              Flash(msg, 'alert', $(this.$el));
+              this.recoverNoteContent(noteText);
+              callback();
+            });
+          });
+      },
+      formCancelHandler(shouldConfirm, isDirty) {
+        if (shouldConfirm && isDirty) {
+          // eslint-disable-next-line no-alert
+          if (!confirm('Are you sure you want to cancel editing this comment?')) return;
+        }
+        this.$refs.noteBody.resetAutoSave();
+        if (this.oldContent) {
+          this.note.note_html = this.oldContent;
+          this.oldContent = null;
+        }
+        this.isEditing = false;
+      },
+      recoverNoteContent(noteText) {
+        // we need to do this to prevent noteForm inconsistent content warning
+        // this is something we intentionally do so we need to recover the content
+        this.note.note = noteText;
+        this.$refs.noteBody.$refs.noteForm.note = noteText; // TODO: This could be better
+      },
+    },
+    created() {
+      eventHub.$on('enterEditMode', ({ noteId }) => {
+        if (noteId === this.note.id) {
+          this.isEditing = true;
+          this.scrollToNoteIfNeeded($(this.$el));
+        }
+      });
+    },
+  };
+</script>
+
+<template>
+  <li
+    class="note timeline-entry"
+    :id="noteAnchorId"
+    :class="classNameBindings"
+    :data-award-url="note.toggle_award_path">
+    <div class="timeline-entry-inner">
+      <div class="timeline-icon">
+        <user-avatar-link
+          :link-href="author.path"
+          :img-src="author.avatar_url"
+          :img-alt="author.name"
+          :img-size="40"
+          />
+      </div>
+      <div class="timeline-content">
+        <div class="note-header">
+          <issue-note-header
+            :author="author"
+            :created-at="note.created_at"
+            :note-id="note.id"
+            action-text="commented"
+            />
+          <issue-note-actions
+            :author-id="author.id"
+            :note-id="note.id"
+            :access-level="note.human_access"
+            :can-edit="note.current_user.can_edit"
+            :can-delete="note.current_user.can_edit"
+            :can-report-as-abuse="canReportAsAbuse"
+            :report-abuse-path="note.report_abuse_path"
+            @handleEdit="editHandler"
+            @handleDelete="deleteHandler"
+            />
+        </div>
+        <issue-note-body
+          :note="note"
+          :can-edit="note.current_user.can_edit"
+          :is-editing="isEditing"
+          @handleFormUpdate="formUpdateHandler"
+          @cancelFormEdition="formCancelHandler"
+          ref="noteBody"
+          />
+      </div>
+    </div>
+  </li>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_note_actions.vue b/app/assets/javascripts/notes/components/issue_note_actions.vue
new file mode 100644
index 00000000000..60c172321d1
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_note_actions.vue
@@ -0,0 +1,167 @@
+<script>
+  import { mapGetters } from 'vuex';
+  import emojiSmiling from 'icons/_emoji_slightly_smiling_face.svg';
+  import emojiSmile from 'icons/_emoji_smile.svg';
+  import emojiSmiley from 'icons/_emoji_smiley.svg';
+  import editSvg from 'icons/_icon_pencil.svg';
+  import ellipsisSvg from 'icons/_ellipsis_v.svg';
+  import loadingIcon from '../../vue_shared/components/loading_icon.vue';
+  import tooltip from '../../vue_shared/directives/tooltip';
+
+  export default {
+    name: 'issueNoteActions',
+    props: {
+      authorId: {
+        type: Number,
+        required: true,
+      },
+      noteId: {
+        type: Number,
+        required: true,
+      },
+      accessLevel: {
+        type: String,
+        required: false,
+        default: '',
+      },
+      reportAbusePath: {
+        type: String,
+        required: true,
+      },
+      canEdit: {
+        type: Boolean,
+        required: true,
+      },
+      canDelete: {
+        type: Boolean,
+        required: true,
+      },
+      canReportAsAbuse: {
+        type: Boolean,
+        required: true,
+      },
+    },
+    directives: {
+      tooltip,
+    },
+    components: {
+      loadingIcon,
+    },
+    computed: {
+      ...mapGetters([
+        'getUserDataByProp',
+      ]),
+      shouldShowActionsDropdown() {
+        return this.currentUserId && (this.canEdit || this.canReportAsAbuse);
+      },
+      canAddAwardEmoji() {
+        return this.currentUserId;
+      },
+      isAuthoredByCurrentUser() {
+        return this.authorId === this.currentUserId;
+      },
+      currentUserId() {
+        return this.getUserDataByProp('id');
+      },
+    },
+    methods: {
+      onEdit() {
+        this.$emit('handleEdit');
+      },
+      onDelete() {
+        this.$emit('handleDelete');
+      },
+    },
+    created() {
+      this.emojiSmiling = emojiSmiling;
+      this.emojiSmile = emojiSmile;
+      this.emojiSmiley = emojiSmiley;
+      this.editSvg = editSvg;
+      this.ellipsisSvg = ellipsisSvg;
+    },
+  };
+</script>
+
+<template>
+  <div class="note-actions">
+    <span
+      v-if="accessLevel"
+      class="note-role">{{accessLevel}}</span>
+    <div
+      v-if="canAddAwardEmoji"
+      class="note-actions-item">
+      <a
+        v-tooltip
+        :class="{ 'js-user-authored': isAuthoredByCurrentUser }"
+        class="note-action-button note-emoji-button js-add-award js-note-emoji"
+        data-position="right"
+        data-placement="bottom"
+        data-container="body"
+        href="#"
+        title="Add reaction">
+          <loading-icon :inline="true" />
+          <span
+            v-html="emojiSmiling"
+            class="link-highlight award-control-icon-neutral">
+          </span>
+          <span
+            v-html="emojiSmiley"
+            class="link-highlight award-control-icon-positive">
+          </span>
+          <span
+            v-html="emojiSmile"
+            class="link-highlight award-control-icon-super-positive">
+          </span>
+      </a>
+    </div>
+    <div
+      v-if="canEdit"
+      class="note-actions-item">
+      <button
+        @click="onEdit"
+        v-tooltip
+        type="button"
+        title="Edit comment"
+        class="note-action-button js-note-edit btn btn-transparent"
+        data-container="body"
+        data-placement="bottom">
+          <span
+            v-html="editSvg"
+            class="link-highlight"></span>
+      </button>
+    </div>
+    <div
+      v-if="shouldShowActionsDropdown"
+      class="dropdown more-actions note-actions-item">
+      <button
+        v-tooltip
+        type="button"
+        title="More actions"
+        class="note-action-button more-actions-toggle btn btn-transparent"
+        data-toggle="dropdown"
+        data-container="body"
+        data-placement="bottom">
+          <span
+            class="icon"
+            v-html="ellipsisSvg"></span>
+      </button>
+      <ul class="dropdown-menu more-actions-dropdown dropdown-open-left">
+        <li v-if="canReportAsAbuse">
+          <a :href="reportAbusePath">
+            Report as abuse
+          </a>
+        </li>
+        <li v-if="canEdit">
+          <button
+            @click.prevent="onDelete"
+            class="btn btn-transparent js-note-delete js-note-delete"
+            type="button">
+            <span class="text-danger">
+              Delete comment
+            </span>
+          </button>
+        </li>
+      </ul>
+    </div>
+  </div>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_note_attachment.vue b/app/assets/javascripts/notes/components/issue_note_attachment.vue
new file mode 100644
index 00000000000..7134a3eb47e
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_note_attachment.vue
@@ -0,0 +1,37 @@
+<script>
+  export default {
+    name: 'issueNoteAttachment',
+    props: {
+      attachment: {
+        type: Object,
+        required: true,
+      },
+    },
+  };
+</script>
+
+<template>
+  <div class="note-attachment">
+    <a
+      v-if="attachment.image"
+      :href="attachment.url"
+      target="_blank"
+      rel="noopener noreferrer">
+      <img
+        :src="attachment.url"
+        class="note-image-attach" />
+    </a>
+    <div class="attachment">
+      <a
+        v-if="attachment.url"
+        :href="attachment.url"
+        target="_blank"
+        rel="noopener noreferrer">
+        <i
+          class="fa fa-paperclip"
+          aria-hidden="true"></i>
+        {{attachment.filename}}
+      </a>
+    </div>
+  </div>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_note_awards_list.vue b/app/assets/javascripts/notes/components/issue_note_awards_list.vue
new file mode 100644
index 00000000000..d42e61e3899
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_note_awards_list.vue
@@ -0,0 +1,228 @@
+<script>
+  /* global Flash */
+
+  import { mapActions, mapGetters } from 'vuex';
+  import emojiSmiling from 'icons/_emoji_slightly_smiling_face.svg';
+  import emojiSmile from 'icons/_emoji_smile.svg';
+  import emojiSmiley from 'icons/_emoji_smiley.svg';
+  import { glEmojiTag } from '../../emoji';
+  import tooltip from '../../vue_shared/directives/tooltip';
+
+  export default {
+    props: {
+      awards: {
+        type: Array,
+        required: true,
+      },
+      toggleAwardPath: {
+        type: String,
+        required: true,
+      },
+      noteAuthorId: {
+        type: Number,
+        required: true,
+      },
+      noteId: {
+        type: Number,
+        required: true,
+      },
+    },
+    directives: {
+      tooltip,
+    },
+    computed: {
+      ...mapGetters([
+        'getUserData',
+      ]),
+      // `this.awards` is an array with emojis but they are not grouped by emoji name. See below.
+      // [ { name: foo, user: user1 }, { name: bar, user: user1 }, { name: foo, user: user2 } ]
+      // This method will group emojis by their name as an Object. See below.
+      // {
+      //   foo: [ { name: foo, user: user1 }, { name: foo, user: user2 } ],
+      //   bar: [ { name: bar, user: user1 } ]
+      // }
+      // We need to do this otherwise we will render the same emoji over and over again.
+      groupedAwards() {
+        const awards = this.awards.reduce((acc, award) => {
+          if (Object.prototype.hasOwnProperty.call(acc, award.name)) {
+            acc[award.name].push(award);
+          } else {
+            Object.assign(acc, { [award.name]: [award] });
+          }
+
+          return acc;
+        }, {});
+
+        const orderedAwards = {};
+        const { thumbsdown, thumbsup } = awards;
+        // Always show thumbsup and thumbsdown first
+        if (thumbsup) {
+          orderedAwards.thumbsup = thumbsup;
+          delete awards.thumbsup;
+        }
+        if (thumbsdown) {
+          orderedAwards.thumbsdown = thumbsdown;
+          delete awards.thumbsdown;
+        }
+
+        return Object.assign({}, orderedAwards, awards);
+      },
+      isAuthoredByMe() {
+        return this.noteAuthorId === this.getUserData.id;
+      },
+      isLoggedIn() {
+        return this.getUserData.id;
+      },
+    },
+    methods: {
+      ...mapActions([
+        'toggleAwardRequest',
+      ]),
+      getAwardHTML(name) {
+        return glEmojiTag(name);
+      },
+      getAwardClassBindings(awardList, awardName) {
+        return {
+          active: this.hasReactionByCurrentUser(awardList),
+          disabled: !this.canInteractWithEmoji(awardList, awardName),
+        };
+      },
+      canInteractWithEmoji(awardList, awardName) {
+        let isAllowed = true;
+        const restrictedEmojis = ['thumbsup', 'thumbsdown'];
+
+        // Users can not add :+1: and :-1: to their own notes
+        if (this.getUserData.id === this.noteAuthorId && restrictedEmojis.indexOf(awardName) > -1) {
+          isAllowed = false;
+        }
+
+        return this.getUserData.id && isAllowed;
+      },
+      hasReactionByCurrentUser(awardList) {
+        return awardList.filter(award => award.user.id === this.getUserData.id).length;
+      },
+      awardTitle(awardsList) {
+        const hasReactionByCurrentUser = this.hasReactionByCurrentUser(awardsList);
+        const TOOLTIP_NAME_COUNT = hasReactionByCurrentUser ? 9 : 10;
+        let awardList = awardsList;
+
+        // Filter myself from list if I am awarded.
+        if (hasReactionByCurrentUser) {
+          awardList = awardList.filter(award => award.user.id !== this.getUserData.id);
+        }
+
+        // Get only 9-10 usernames to show in tooltip text.
+        const namesToShow = awardList.slice(0, TOOLTIP_NAME_COUNT).map(award => award.user.name);
+
+        // Get the remaining list to use in `and x more` text.
+        const remainingAwardList = awardList.slice(TOOLTIP_NAME_COUNT, awardList.length);
+
+        // Add myself to the begining of the list so title will start with You.
+        if (hasReactionByCurrentUser) {
+          namesToShow.unshift('You');
+        }
+
+        let title = '';
+
+        // We have 10+ awarded user, join them with comma and add `and x more`.
+        if (remainingAwardList.length) {
+          title = `${namesToShow.join(', ')}, and ${remainingAwardList.length} more.`;
+        } else if (namesToShow.length > 1) {
+          // Join all names with comma but not the last one, it will be added with and text.
+          title = namesToShow.slice(0, namesToShow.length - 1).join(', ');
+          // If we have more than 2 users we need an extra comma before and text.
+          title += namesToShow.length > 2 ? ',' : '';
+          title += ` and ${namesToShow.slice(-1)}`; // Append and text
+        } else { // We have only 2 users so join them with and.
+          title = namesToShow.join(' and ');
+        }
+
+        return title;
+      },
+      handleAward(awardName) {
+        if (!this.isLoggedIn) {
+          return;
+        }
+
+        let parsedName;
+
+        // 100 and 1234 emoji are a number. Callback for v-for click sends it as a string
+        switch (awardName) {
+          case '100':
+            parsedName = 100;
+            break;
+          case '1234':
+            parsedName = 1234;
+            break;
+          default:
+            parsedName = awardName;
+            break;
+        }
+
+        const data = {
+          endpoint: this.toggleAwardPath,
+          noteId: this.noteId,
+          awardName: parsedName,
+        };
+
+        this.toggleAwardRequest(data)
+          .catch(() => Flash('Something went wrong on our end.'));
+      },
+    },
+    created() {
+      this.emojiSmiling = emojiSmiling;
+      this.emojiSmile = emojiSmile;
+      this.emojiSmiley = emojiSmiley;
+    },
+  };
+</script>
+
+<template>
+  <div class="note-awards">
+    <div class="awards js-awards-block">
+      <button
+        v-tooltip
+        v-for="(awardList, awardName, index) in groupedAwards"
+        :key="index"
+        :class="getAwardClassBindings(awardList, awardName)"
+        :title="awardTitle(awardList)"
+        @click="handleAward(awardName)"
+        class="btn award-control"
+        data-placement="bottom"
+        type="button">
+        <span v-html="getAwardHTML(awardName)"></span>
+        <span class="award-control-text js-counter">
+          {{awardList.length}}
+        </span>
+      </button>
+      <div
+        v-if="isLoggedIn"
+        class="award-menu-holder">
+        <button
+          v-tooltip
+          :class="{ 'js-user-authored': isAuthoredByMe }"
+          class="award-control btn js-add-award"
+          title="Add reaction"
+          aria-label="Add reaction"
+          data-placement="bottom"
+          type="button">
+          <span
+            v-html="emojiSmiling"
+            class="award-control-icon award-control-icon-neutral">
+          </span>
+          <span
+            v-html="emojiSmiley"
+            class="award-control-icon award-control-icon-positive">
+          </span>
+          <span
+            v-html="emojiSmile"
+            class="award-control-icon award-control-icon-super-positive">
+          </span>
+          <i
+            aria-hidden="true"
+            class="fa fa-spinner fa-spin award-control-icon award-control-icon-loading"></i>
+        </button>
+      </div>
+    </div>
+  </div>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_note_body.vue b/app/assets/javascripts/notes/components/issue_note_body.vue
new file mode 100644
index 00000000000..5f9003bfd87
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_note_body.vue
@@ -0,0 +1,122 @@
+<script>
+  import issueNoteEditedText from './issue_note_edited_text.vue';
+  import issueNoteAwardsList from './issue_note_awards_list.vue';
+  import issueNoteAttachment from './issue_note_attachment.vue';
+  import issueNoteForm from './issue_note_form.vue';
+  import TaskList from '../../task_list';
+  import autosave from '../mixins/autosave';
+
+  export default {
+    props: {
+      note: {
+        type: Object,
+        required: true,
+      },
+      canEdit: {
+        type: Boolean,
+        required: true,
+      },
+      isEditing: {
+        type: Boolean,
+        required: false,
+        default: false,
+      },
+    },
+    mixins: [
+      autosave,
+    ],
+    components: {
+      issueNoteEditedText,
+      issueNoteAwardsList,
+      issueNoteAttachment,
+      issueNoteForm,
+    },
+    computed: {
+      noteBody() {
+        return this.note.note;
+      },
+    },
+    methods: {
+      renderGFM() {
+        $(this.$refs['note-body']).renderGFM();
+      },
+      initTaskList() {
+        if (this.canEdit) {
+          this.taskList = new TaskList({
+            dataType: 'note',
+            fieldName: 'note',
+            selector: '.notes',
+          });
+        }
+      },
+      handleFormUpdate(note, parentElement, callback) {
+        this.$emit('handleFormUpdate', note, parentElement, callback);
+      },
+      formCancelHandler(shouldConfirm, isDirty) {
+        this.$emit('cancelFormEdition', shouldConfirm, isDirty);
+      },
+    },
+    mounted() {
+      this.renderGFM();
+      this.initTaskList();
+
+      if (this.isEditing) {
+        this.initAutoSave();
+      }
+    },
+    updated() {
+      this.initTaskList();
+      this.renderGFM();
+
+      if (this.isEditing) {
+        if (!this.autosave) {
+          this.initAutoSave();
+        } else {
+          this.setAutoSave();
+        }
+      }
+    },
+  };
+</script>
+
+<template>
+  <div
+    :class="{ 'js-task-list-container': canEdit }"
+    ref="note-body"
+    class="note-body">
+    <div
+      v-html="note.note_html"
+      class="note-text md"></div>
+    <issue-note-form
+      v-if="isEditing"
+      ref="noteForm"
+      @handleFormUpdate="handleFormUpdate"
+      @cancelFormEdition="formCancelHandler"
+      :is-editing="isEditing"
+      :note-body="noteBody"
+      :note-id="note.id"
+      />
+    <textarea
+      v-if="canEdit"
+      v-model="note.note"
+      :data-update-url="note.path"
+      class="hidden js-task-list-field"></textarea>
+    <issue-note-edited-text
+      v-if="note.last_edited_at"
+      :edited-at="note.last_edited_at"
+      :edited-by="note.last_edited_by"
+      action-text="Edited"
+      />
+    <issue-note-awards-list
+      v-if="note.award_emoji.length"
+      :note-id="note.id"
+      :note-author-id="note.author.id"
+      :awards="note.award_emoji"
+      :toggle-award-path="note.toggle_award_path"
+      />
+    <issue-note-attachment
+      v-if="note.attachment"
+      :attachment="note.attachment"
+      />
+  </div>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_note_edited_text.vue b/app/assets/javascripts/notes/components/issue_note_edited_text.vue
new file mode 100644
index 00000000000..49e09f0ecc5
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_note_edited_text.vue
@@ -0,0 +1,47 @@
+<script>
+  import timeAgoTooltip from '../../vue_shared/components/time_ago_tooltip.vue';
+
+  export default {
+    name: 'editedNoteText',
+    props: {
+      actionText: {
+        type: String,
+        required: true,
+      },
+      editedAt: {
+        type: String,
+        required: true,
+      },
+      editedBy: {
+        type: Object,
+        required: false,
+      },
+      className: {
+        type: String,
+        required: false,
+        default: 'edited-text',
+      },
+    },
+    components: {
+      timeAgoTooltip,
+    },
+  };
+</script>
+
+<template>
+  <div :class="className">
+    {{actionText}}
+    <time-ago-tooltip
+      :time="editedAt"
+      tooltip-placement="bottom"
+      />
+    <template v-if="editedBy">
+      by
+      <a
+        :href="editedBy.path"
+        class="js-vue-author author_link">
+        {{editedBy.name}}
+      </a>
+    </template>
+  </div>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_note_form.vue b/app/assets/javascripts/notes/components/issue_note_form.vue
new file mode 100644
index 00000000000..626c0f2ce18
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_note_form.vue
@@ -0,0 +1,166 @@
+<script>
+  import { mapGetters } from 'vuex';
+  import eventHub from '../event_hub';
+  import confidentialIssue from '../../vue_shared/components/issue/confidential_issue_warning.vue';
+  import markdownField from '../../vue_shared/components/markdown/field.vue';
+
+  export default {
+    name: 'issueNoteForm',
+    props: {
+      noteBody: {
+        type: String,
+        required: false,
+        default: '',
+      },
+      noteId: {
+        type: Number,
+        required: false,
+      },
+      saveButtonTitle: {
+        type: String,
+        required: false,
+        default: 'Save comment',
+      },
+      discussion: {
+        type: Object,
+        required: false,
+        default: () => ({}),
+      },
+      isEditing: {
+        type: Boolean,
+        required: true,
+      },
+    },
+    data() {
+      return {
+        note: this.noteBody,
+        conflictWhileEditing: false,
+        isSubmitting: false,
+      };
+    },
+    components: {
+      confidentialIssue,
+      markdownField,
+    },
+    computed: {
+      ...mapGetters([
+        'getDiscussionLastNote',
+        'getIssueDataByProp',
+        'getNotesDataByProp',
+        'getUserDataByProp',
+      ]),
+      noteHash() {
+        return `#note_${this.noteId}`;
+      },
+      markdownPreviewPath() {
+        return this.getIssueDataByProp('preview_note_path');
+      },
+      markdownDocsPath() {
+        return this.getNotesDataByProp('markdownDocsPath');
+      },
+      quickActionsDocsPath() {
+        return !this.isEditing ? this.getNotesDataByProp('quickActionsDocsPath') : undefined;
+      },
+      currentUserId() {
+        return this.getUserDataByProp('id');
+      },
+      isDisabled() {
+        return !this.note.length || this.isSubmitting;
+      },
+      isConfidentialIssue() {
+        return this.getIssueDataByProp('confidential');
+      },
+    },
+    methods: {
+      handleUpdate() {
+        this.isSubmitting = true;
+
+        this.$emit('handleFormUpdate', this.note, this.$refs.editNoteForm, () => {
+          this.isSubmitting = false;
+        });
+      },
+      editMyLastNote() {
+        if (this.note === '') {
+          const lastNoteInDiscussion = this.getDiscussionLastNote(this.discussion);
+
+          if (lastNoteInDiscussion) {
+            eventHub.$emit('enterEditMode', {
+              noteId: lastNoteInDiscussion.id,
+            });
+          }
+        }
+      },
+      cancelHandler(shouldConfirm = false) {
+        // Sends information about confirm message and if the textarea has changed
+        this.$emit('cancelFormEdition', shouldConfirm, this.noteBody !== this.note);
+      },
+    },
+    mounted() {
+      this.$refs.textarea.focus();
+    },
+    watch: {
+      noteBody() {
+        if (this.note === this.noteBody) {
+          this.note = this.noteBody;
+        } else {
+          this.conflictWhileEditing = true;
+        }
+      },
+    },
+  };
+</script>
+
+<template>
+  <div ref="editNoteForm" class="note-edit-form current-note-edit-form">
+    <div
+      v-if="conflictWhileEditing"
+      class="js-conflict-edit-warning alert alert-danger">
+      This comment has changed since you started editing, please review the
+      <a
+        :href="noteHash"
+        target="_blank"
+        rel="noopener noreferrer">updated comment</a>
+        to ensure information is not lost.
+    </div>
+    <div class="flash-container timeline-content"></div>
+    <form
+      class="edit-note common-note-form js-quick-submit gfm-form">
+      <confidentialIssue v-if="isConfidentialIssue" />
+      <markdown-field
+        :markdown-preview-path="markdownPreviewPath"
+        :markdown-docs-path="markdownDocsPath"
+        :quick-actions-docs-path="quickActionsDocsPath"
+        :add-spacing-classes="false">
+        <textarea
+          id="note_note"
+          name="note[note]"
+          class="note-textarea js-gfm-input js-autosize markdown-area js-vue-issue-note-form js-vue-textarea"
+          :data-supports-quick-actions="!isEditing"
+          aria-label="Description"
+          v-model="note"
+          ref="textarea"
+          slot="textarea"
+          placeholder="Write a comment or drag your files here..."
+          @keydown.meta.enter="handleUpdate()"
+          @keydown.up="editMyLastNote()"
+          @keydown.esc="cancelHandler(true)">
+        </textarea>
+      </markdown-field>
+      <div class="note-form-actions clearfix">
+        <button
+          type="button"
+          @click="handleUpdate()"
+          :disabled="isDisabled"
+          class="js-vue-issue-save btn btn-save">
+          {{saveButtonTitle}}
+        </button>
+        <button
+          @click="cancelHandler()"
+          class="btn btn-cancel note-edit-cancel"
+          type="button">
+          Cancel
+        </button>
+      </div>
+    </form>
+  </div>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_note_header.vue b/app/assets/javascripts/notes/components/issue_note_header.vue
new file mode 100644
index 00000000000..63aa3d777d0
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_note_header.vue
@@ -0,0 +1,118 @@
+<script>
+  import { mapActions } from 'vuex';
+  import timeAgoTooltip from '../../vue_shared/components/time_ago_tooltip.vue';
+
+  export default {
+    props: {
+      author: {
+        type: Object,
+        required: true,
+      },
+      createdAt: {
+        type: String,
+        required: true,
+      },
+      actionText: {
+        type: String,
+        required: false,
+        default: '',
+      },
+      actionTextHtml: {
+        type: String,
+        required: false,
+        default: '',
+      },
+      noteId: {
+        type: Number,
+        required: true,
+      },
+      includeToggle: {
+        type: Boolean,
+        required: false,
+        default: false,
+      },
+    },
+    data() {
+      return {
+        isExpanded: true,
+      };
+    },
+    components: {
+      timeAgoTooltip,
+    },
+    computed: {
+      toggleChevronClass() {
+        return this.isExpanded ? 'fa-chevron-up' : 'fa-chevron-down';
+      },
+      noteTimestampLink() {
+        return `#note_${this.noteId}`;
+      },
+    },
+    methods: {
+      ...mapActions([
+        'setTargetNoteHash',
+      ]),
+      handleToggle() {
+        this.isExpanded = !this.isExpanded;
+        this.$emit('toggleHandler');
+      },
+      updateTargetNoteHash() {
+        this.setTargetNoteHash(this.noteTimestampLink);
+      },
+    },
+  };
+</script>
+
+<template>
+  <div class="note-header-info">
+    <a :href="author.path">
+      <span class="note-header-author-name">
+        {{author.name}}
+      </span>
+      <span class="note-headline-light">
+        @{{author.username}}
+      </span>
+    </a>
+    <span class="note-headline-light">
+      <span class="note-headline-meta">
+        <template v-if="actionText">
+          {{actionText}}
+        </template>
+        <span
+          v-if="actionTextHtml"
+          v-html="actionTextHtml"
+          class="system-note-message">
+        </span>
+        <a
+          :href="noteTimestampLink"
+          @click="updateTargetNoteHash"
+          class="note-timestamp">
+          <time-ago-tooltip
+            :time="createdAt"
+            tooltip-placement="bottom"
+            />
+        </a>
+        <i
+          class="fa fa-spinner fa-spin editing-spinner"
+          aria-label="Comment is being updated"
+          aria-hidden="true">
+        </i>
+      </span>
+    </span>
+    <div
+      v-if="includeToggle"
+      class="discussion-actions">
+      <button
+        @click="handleToggle"
+        class="note-action-button discussion-toggle-button js-vue-toggle-button"
+        type="button">
+          <i
+            :class="toggleChevronClass"
+            class="fa"
+            aria-hidden="true">
+          </i>
+          Toggle discussion
+      </button>
+    </div>
+  </div>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_note_icons.js b/app/assets/javascripts/notes/components/issue_note_icons.js
new file mode 100644
index 00000000000..d8e3cb4bc01
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_note_icons.js
@@ -0,0 +1,37 @@
+import iconArrowCircle from 'icons/_icon_arrow_circle_o_right.svg';
+import iconCheck from 'icons/_icon_check_square_o.svg';
+import iconClock from 'icons/_icon_clock_o.svg';
+import iconCodeFork from 'icons/_icon_code_fork.svg';
+import iconComment from 'icons/_icon_comment_o.svg';
+import iconCommit from 'icons/_icon_commit.svg';
+import iconEdit from 'icons/_icon_edit.svg';
+import iconEye from 'icons/_icon_eye.svg';
+import iconEyeSlash from 'icons/_icon_eye_slash.svg';
+import iconMerge from 'icons/_icon_merge.svg';
+import iconMerged from 'icons/_icon_merged.svg';
+import iconRandom from 'icons/_icon_random.svg';
+import iconClosed from 'icons/_icon_status_closed.svg';
+import iconStatusOpen from 'icons/_icon_status_open.svg';
+import iconStopwatch from 'icons/_icon_stopwatch.svg';
+import iconTags from 'icons/_icon_tags.svg';
+import iconUser from 'icons/_icon_user.svg';
+
+export default {
+  icon_arrow_circle_o_right: iconArrowCircle,
+  icon_check_square_o: iconCheck,
+  icon_clock_o: iconClock,
+  icon_code_fork: iconCodeFork,
+  icon_comment_o: iconComment,
+  icon_commit: iconCommit,
+  icon_edit: iconEdit,
+  icon_eye: iconEye,
+  icon_eye_slash: iconEyeSlash,
+  icon_merge: iconMerge,
+  icon_merged: iconMerged,
+  icon_random: iconRandom,
+  icon_status_closed: iconClosed,
+  icon_status_open: iconStatusOpen,
+  icon_stopwatch: iconStopwatch,
+  icon_tags: iconTags,
+  icon_user: iconUser,
+};
diff --git a/app/assets/javascripts/notes/components/issue_note_signed_out_widget.vue b/app/assets/javascripts/notes/components/issue_note_signed_out_widget.vue
new file mode 100644
index 00000000000..77af3594c1c
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_note_signed_out_widget.vue
@@ -0,0 +1,28 @@
+<script>
+  import { mapGetters } from 'vuex';
+
+  export default {
+    name: 'singInLinksNotes',
+    computed: {
+      ...mapGetters([
+        'getNotesDataByProp',
+      ]),
+      registerLink() {
+        return this.getNotesDataByProp('registerPath');
+      },
+      signInLink() {
+        return this.getNotesDataByProp('newSessionPath');
+      },
+    },
+  };
+</script>
+
+<template>
+  <div class="disabled-comment text-center">
+    Please
+    <a :href="registerLink">register</a>
+    or
+    <a :href="signInLink">sign in</a>
+    to reply
+  </div>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_notes_app.vue b/app/assets/javascripts/notes/components/issue_notes_app.vue
new file mode 100644
index 00000000000..b6fc5e5036f
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_notes_app.vue
@@ -0,0 +1,151 @@
+<script>
+  /* global Flash */
+  import { mapGetters, mapActions } from 'vuex';
+  import store from '../stores/';
+  import * as constants from '../constants';
+  import issueNote from './issue_note.vue';
+  import issueDiscussion from './issue_discussion.vue';
+  import issueSystemNote from './issue_system_note.vue';
+  import issueCommentForm from './issue_comment_form.vue';
+  import placeholderNote from './issue_placeholder_note.vue';
+  import placeholderSystemNote from './issue_placeholder_system_note.vue';
+  import loadingIcon from '../../vue_shared/components/loading_icon.vue';
+
+  export default {
+    name: 'issueNotesApp',
+    props: {
+      issueData: {
+        type: Object,
+        required: true,
+      },
+      notesData: {
+        type: Object,
+        required: true,
+      },
+      userData: {
+        type: Object,
+        required: false,
+        default: {},
+      },
+    },
+    store,
+    data() {
+      return {
+        isLoading: true,
+      };
+    },
+    components: {
+      issueNote,
+      issueDiscussion,
+      issueSystemNote,
+      issueCommentForm,
+      loadingIcon,
+      placeholderNote,
+      placeholderSystemNote,
+    },
+    computed: {
+      ...mapGetters([
+        'notes',
+        'getNotesDataByProp',
+      ]),
+    },
+    methods: {
+      ...mapActions({
+        actionFetchNotes: 'fetchNotes',
+        poll: 'poll',
+        actionToggleAward: 'toggleAward',
+        scrollToNoteIfNeeded: 'scrollToNoteIfNeeded',
+        setNotesData: 'setNotesData',
+        setIssueData: 'setIssueData',
+        setUserData: 'setUserData',
+        setLastFetchedAt: 'setLastFetchedAt',
+        setTargetNoteHash: 'setTargetNoteHash',
+      }),
+      getComponentName(note) {
+        if (note.isPlaceholderNote) {
+          if (note.placeholderType === constants.SYSTEM_NOTE) {
+            return placeholderSystemNote;
+          }
+          return placeholderNote;
+        } else if (note.individual_note) {
+          return note.notes[0].system ? issueSystemNote : issueNote;
+        }
+
+        return issueDiscussion;
+      },
+      getComponentData(note) {
+        return note.individual_note ? note.notes[0] : note;
+      },
+      fetchNotes() {
+        return this.actionFetchNotes(this.getNotesDataByProp('discussionsPath'))
+          .then(() => this.initPolling())
+          .then(() => {
+            this.isLoading = false;
+          })
+          .then(() => this.$nextTick())
+          .then(() => this.checkLocationHash())
+          .catch(() => {
+            this.isLoading = false;
+            Flash('Something went wrong while fetching issue comments. Please try again.');
+          });
+      },
+      initPolling() {
+        this.setLastFetchedAt(this.getNotesDataByProp('lastFetchedAt'));
+
+        this.poll();
+      },
+      checkLocationHash() {
+        const hash = gl.utils.getLocationHash();
+        const element = document.getElementById(hash);
+
+        if (hash && element) {
+          this.setTargetNoteHash(hash);
+          this.scrollToNoteIfNeeded($(element));
+        }
+      },
+    },
+    created() {
+      this.setNotesData(this.notesData);
+      this.setIssueData(this.issueData);
+      this.setUserData(this.userData);
+    },
+    mounted() {
+      this.fetchNotes();
+
+      const parentElement = this.$el.parentElement;
+
+      if (parentElement &&
+        parentElement.classList.contains('js-vue-notes-event')) {
+        parentElement.addEventListener('toggleAward', (event) => {
+          const { awardName, noteId } = event.detail;
+          this.actionToggleAward({ awardName, noteId });
+        });
+      }
+    },
+  };
+</script>
+
+<template>
+  <div id="notes">
+    <div
+      v-if="isLoading"
+      class="js-loading loading">
+      <loading-icon />
+    </div>
+
+    <ul
+      v-if="!isLoading"
+      id="notes-list"
+      class="notes main-notes-list timeline">
+
+      <component
+        v-for="note in notes"
+        :is="getComponentName(note)"
+        :note="getComponentData(note)"
+        :key="note.id"
+        />
+    </ul>
+
+    <issue-comment-form />
+  </div>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_placeholder_note.vue b/app/assets/javascripts/notes/components/issue_placeholder_note.vue
new file mode 100644
index 00000000000..6921d91372f
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_placeholder_note.vue
@@ -0,0 +1,53 @@
+<script>
+  import { mapGetters } from 'vuex';
+  import userAvatarLink from '../../vue_shared/components/user_avatar/user_avatar_link.vue';
+
+  export default {
+    name: 'issuePlaceholderNote',
+    props: {
+      note: {
+        type: Object,
+        required: true,
+      },
+    },
+    components: {
+      userAvatarLink,
+    },
+    computed: {
+      ...mapGetters([
+        'getUserData',
+      ]),
+    },
+  };
+</script>
+
+<template>
+  <li class="note being-posted fade-in-half timeline-entry">
+    <div class="timeline-entry-inner">
+      <div class="timeline-icon">
+        <user-avatar-link
+          :link-href="getUserData.path"
+          :img-src="getUserData.avatar_url"
+          :img-size="40"
+          />
+      </div>
+      <div
+        :class="{ discussion: !note.individual_note }"
+        class="timeline-content">
+        <div class="note-header">
+          <div class="note-header-info">
+            <a :href="getUserData.path">
+              <span class="hidden-xs">{{getUserData.name}}</span>
+              <span class="note-headline-light">@{{getUserData.username}}</span>
+            </a>
+          </div>
+        </div>
+        <div class="note-body">
+          <div class="note-text">
+            <p>{{note.body}}</p>
+          </div>
+        </div>
+      </div>
+    </div>
+  </li>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_placeholder_system_note.vue b/app/assets/javascripts/notes/components/issue_placeholder_system_note.vue
new file mode 100644
index 00000000000..80a8ef56a83
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_placeholder_system_note.vue
@@ -0,0 +1,21 @@
+<script>
+  export default {
+    name: 'placeholderSystemNote',
+    props: {
+      note: {
+        type: Object,
+        required: true,
+      },
+    },
+  };
+</script>
+
+<template>
+  <li class="note system-note timeline-entry being-posted fade-in-half">
+   <div class="timeline-entry-inner">
+     <div class="timeline-content">
+       <em>{{note.body}}</em>
+     </div>
+   </div>
+  </li>
+</template>
diff --git a/app/assets/javascripts/notes/components/issue_system_note.vue b/app/assets/javascripts/notes/components/issue_system_note.vue
new file mode 100644
index 00000000000..5bb8f871b9d
--- /dev/null
+++ b/app/assets/javascripts/notes/components/issue_system_note.vue
@@ -0,0 +1,55 @@
+<script>
+  import { mapGetters } from 'vuex';
+  import iconsMap from './issue_note_icons';
+  import issueNoteHeader from './issue_note_header.vue';
+
+  export default {
+    name: 'systemNote',
+    props: {
+      note: {
+        type: Object,
+        required: true,
+      },
+    },
+    components: {
+      issueNoteHeader,
+    },
+    computed: {
+      ...mapGetters([
+        'targetNoteHash',
+      ]),
+      noteAnchorId() {
+        return `note_${this.note.id}`;
+      },
+      isTargetNote() {
+        return this.targetNoteHash === this.noteAnchorId;
+      },
+    },
+    created() {
+      this.svg = iconsMap[this.note.system_note_icon_name];
+    },
+  };
+</script>
+
+<template>
+  <li
+    :id="noteAnchorId"
+    :class="{ target: isTargetNote }"
+    class="note system-note timeline-entry">
+    <div class="timeline-entry-inner">
+      <div
+        class="timeline-icon"
+        v-html="svg">
+      </div>
+      <div class="timeline-content">
+        <div class="note-header">
+          <issue-note-header
+            :author="note.author"
+            :created-at="note.created_at"
+            :note-id="note.id"
+            :action-text-html="note.note_html" />
+        </div>
+      </div>
+    </div>
+  </li>
+</template>
diff --git a/app/assets/javascripts/notes/constants.js b/app/assets/javascripts/notes/constants.js
new file mode 100644
index 00000000000..a6961063c01
--- /dev/null
+++ b/app/assets/javascripts/notes/constants.js
@@ -0,0 +1,11 @@
+export const DISCUSSION_NOTE = 'DiscussionNote';
+export const DISCUSSION = 'discussion';
+export const NOTE = 'note';
+export const SYSTEM_NOTE = 'systemNote';
+export const COMMENT = 'comment';
+export const OPENED = 'opened';
+export const REOPENED = 'reopened';
+export const CLOSED = 'closed';
+export const EMOJI_THUMBSUP = 'thumbsup';
+export const EMOJI_THUMBSDOWN = 'thumbsdown';
+export const NOTEABLE_TYPE = 'Issue';
diff --git a/app/assets/javascripts/notes/event_hub.js b/app/assets/javascripts/notes/event_hub.js
new file mode 100644
index 00000000000..0948c2e5352
--- /dev/null
+++ b/app/assets/javascripts/notes/event_hub.js
@@ -0,0 +1,3 @@
+import Vue from 'vue';
+
+export default new Vue();
diff --git a/app/assets/javascripts/notes/index.js b/app/assets/javascripts/notes/index.js
new file mode 100644
index 00000000000..e2ea37408cf
--- /dev/null
+++ b/app/assets/javascripts/notes/index.js
@@ -0,0 +1,35 @@
+import Vue from 'vue';
+import issueNotesApp from './components/issue_notes_app.vue';
+
+document.addEventListener('DOMContentLoaded', () => new Vue({
+  el: '#js-vue-notes',
+  components: {
+    issueNotesApp,
+  },
+  data() {
+    const notesDataset = document.getElementById('js-vue-notes').dataset;
+
+    return {
+      issueData: JSON.parse(notesDataset.issueData),
+      currentUserData: JSON.parse(notesDataset.currentUserData),
+      notesData: {
+        lastFetchedAt: notesDataset.lastFetchedAt,
+        discussionsPath: notesDataset.discussionsPath,
+        newSessionPath: notesDataset.newSessionPath,
+        registerPath: notesDataset.registerPath,
+        notesPath: notesDataset.notesPath,
+        markdownDocsPath: notesDataset.markdownDocsPath,
+        quickActionsDocsPath: notesDataset.quickActionsDocsPath,
+      },
+    };
+  },
+  render(createElement) {
+    return createElement('issue-notes-app', {
+      props: {
+        issueData: this.issueData,
+        notesData: this.notesData,
+        userData: this.currentUserData,
+      },
+    });
+  },
+}));
diff --git a/app/assets/javascripts/notes/mixins/autosave.js b/app/assets/javascripts/notes/mixins/autosave.js
new file mode 100644
index 00000000000..5843b97f225
--- /dev/null
+++ b/app/assets/javascripts/notes/mixins/autosave.js
@@ -0,0 +1,16 @@
+/* globals Autosave */
+import '../../autosave';
+
+export default {
+  methods: {
+    initAutoSave() {
+      this.autosave = new Autosave($(this.$refs.noteForm.$refs.textarea), ['Note', 'Issue', this.note.id], 'issue');
+    },
+    resetAutoSave() {
+      this.autosave.reset();
+    },
+    setAutoSave() {
+      this.autosave.save();
+    },
+  },
+};
diff --git a/app/assets/javascripts/notes/services/issue_notes_service.js b/app/assets/javascripts/notes/services/issue_notes_service.js
new file mode 100644
index 00000000000..b51b0cb2013
--- /dev/null
+++ b/app/assets/javascripts/notes/services/issue_notes_service.js
@@ -0,0 +1,35 @@
+import Vue from 'vue';
+import VueResource from 'vue-resource';
+
+Vue.use(VueResource);
+
+export default {
+  fetchNotes(endpoint) {
+    return Vue.http.get(endpoint);
+  },
+  deleteNote(endpoint) {
+    return Vue.http.delete(endpoint);
+  },
+  replyToDiscussion(endpoint, data) {
+    return Vue.http.post(endpoint, data, { emulateJSON: true });
+  },
+  updateNote(endpoint, data) {
+    return Vue.http.put(endpoint, data, { emulateJSON: true });
+  },
+  createNewNote(endpoint, data) {
+    return Vue.http.post(endpoint, data, { emulateJSON: true });
+  },
+  poll(data = {}) {
+    const { endpoint, lastFetchedAt } = data;
+    const options = {
+      headers: {
+        'X-Last-Fetched-At': lastFetchedAt,
+      },
+    };
+
+    return Vue.http.get(endpoint, options);
+  },
+  toggleAward(endpoint, data) {
+    return Vue.http.post(endpoint, data, { emulateJSON: true });
+  },
+};
diff --git a/app/assets/javascripts/notes/stores/actions.js b/app/assets/javascripts/notes/stores/actions.js
new file mode 100644
index 00000000000..13cd74bfa1c
--- /dev/null
+++ b/app/assets/javascripts/notes/stores/actions.js
@@ -0,0 +1,217 @@
+/* global Flash */
+import Visibility from 'visibilityjs';
+import Poll from '../../lib/utils/poll';
+import * as types from './mutation_types';
+import * as utils from './utils';
+import * as constants from '../constants';
+import service from '../services/issue_notes_service';
+import loadAwardsHandler from '../../awards_handler';
+import sidebarTimeTrackingEventHub from '../../sidebar/event_hub';
+
+let eTagPoll;
+
+export const setNotesData = ({ commit }, data) => commit(types.SET_NOTES_DATA, data);
+export const setIssueData = ({ commit }, data) => commit(types.SET_ISSUE_DATA, data);
+export const setUserData = ({ commit }, data) => commit(types.SET_USER_DATA, data);
+export const setLastFetchedAt = ({ commit }, data) => commit(types.SET_LAST_FETCHED_AT, data);
+export const setInitialNotes = ({ commit }, data) => commit(types.SET_INITIAL_NOTES, data);
+export const setTargetNoteHash = ({ commit }, data) => commit(types.SET_TARGET_NOTE_HASH, data);
+export const toggleDiscussion = ({ commit }, data) => commit(types.TOGGLE_DISCUSSION, data);
+
+export const fetchNotes = ({ commit }, path) => service
+  .fetchNotes(path)
+  .then(res => res.json())
+  .then((res) => {
+    commit(types.SET_INITIAL_NOTES, res);
+  });
+
+export const deleteNote = ({ commit }, note) => service
+  .deleteNote(note.path)
+  .then(() => {
+    commit(types.DELETE_NOTE, note);
+  });
+
+export const updateNote = ({ commit }, { endpoint, note }) => service
+  .updateNote(endpoint, note)
+  .then(res => res.json())
+  .then((res) => {
+    commit(types.UPDATE_NOTE, res);
+  });
+
+export const replyToDiscussion = ({ commit }, { endpoint, data }) => service
+  .replyToDiscussion(endpoint, data)
+  .then(res => res.json())
+  .then((res) => {
+    commit(types.ADD_NEW_REPLY_TO_DISCUSSION, res);
+
+    return res;
+  });
+
+export const createNewNote = ({ commit }, { endpoint, data }) => service
+  .createNewNote(endpoint, data)
+  .then(res => res.json())
+  .then((res) => {
+    if (!res.errors) {
+      commit(types.ADD_NEW_NOTE, res);
+    }
+    return res;
+  });
+
+export const removePlaceholderNotes = ({ commit }) =>
+  commit(types.REMOVE_PLACEHOLDER_NOTES);
+
+export const saveNote = ({ commit, dispatch }, noteData) => {
+  const { note } = noteData.data.note;
+  let placeholderText = note;
+  const hasQuickActions = utils.hasQuickActions(placeholderText);
+  const replyId = noteData.data.in_reply_to_discussion_id;
+  const methodToDispatch = replyId ? 'replyToDiscussion' : 'createNewNote';
+
+  commit(types.REMOVE_PLACEHOLDER_NOTES); // remove previous placeholders
+  $('.notes-form .flash-container').hide(); // hide previous flash notification
+
+  if (hasQuickActions) {
+    placeholderText = utils.stripQuickActions(placeholderText);
+  }
+
+  if (placeholderText.length) {
+    commit(types.SHOW_PLACEHOLDER_NOTE, {
+      noteBody: placeholderText,
+      replyId,
+    });
+  }
+
+  if (hasQuickActions) {
+    commit(types.SHOW_PLACEHOLDER_NOTE, {
+      isSystemNote: true,
+      noteBody: utils.getQuickActionText(note),
+      replyId,
+    });
+  }
+
+  return dispatch(methodToDispatch, noteData)
+    .then((res) => {
+      const { errors } = res;
+      const commandsChanges = res.commands_changes;
+
+      if (hasQuickActions && errors && Object.keys(errors).length) {
+        eTagPoll.makeRequest();
+
+        $('.js-gfm-input').trigger('clear-commands-cache.atwho');
+        Flash('Commands applied', 'notice', $(noteData.flashContainer));
+      }
+
+      if (commandsChanges) {
+        if (commandsChanges.emoji_award) {
+          const votesBlock = $('.js-awards-block').eq(0);
+
+          loadAwardsHandler()
+            .then((awardsHandler) => {
+              awardsHandler.addAwardToEmojiBar(votesBlock, commandsChanges.emoji_award);
+              awardsHandler.scrollToAwards();
+            })
+            .catch(() => {
+              Flash(
+                'Something went wrong while adding your award. Please try again.',
+                null,
+                $(noteData.flashContainer),
+              );
+            });
+        }
+
+        if (commandsChanges.spend_time != null || commandsChanges.time_estimate != null) {
+          sidebarTimeTrackingEventHub.$emit('timeTrackingUpdated', res);
+        }
+      }
+
+      if (errors && errors.commands_only) {
+        Flash(errors.commands_only, 'notice', $(noteData.flashContainer));
+      }
+      commit(types.REMOVE_PLACEHOLDER_NOTES);
+
+      return res;
+    });
+};
+
+const pollSuccessCallBack = (resp, commit, state, getters) => {
+  if (resp.notes && resp.notes.length) {
+    const { notesById } = getters;
+
+    resp.notes.forEach((note) => {
+      if (notesById[note.id]) {
+        commit(types.UPDATE_NOTE, note);
+      } else if (note.type === constants.DISCUSSION_NOTE) {
+        const discussion = utils.findNoteObjectById(state.notes, note.discussion_id);
+
+        if (discussion) {
+          commit(types.ADD_NEW_REPLY_TO_DISCUSSION, note);
+        } else {
+          commit(types.ADD_NEW_NOTE, note);
+        }
+      } else {
+        commit(types.ADD_NEW_NOTE, note);
+      }
+    });
+  }
+
+  commit(types.SET_LAST_FETCHED_AT, resp.lastFetchedAt);
+
+  return resp;
+};
+
+export const poll = ({ commit, state, getters }) => {
+  const requestData = { endpoint: state.notesData.notesPath, lastFetchedAt: state.lastFetchedAt };
+
+  eTagPoll = new Poll({
+    resource: service,
+    method: 'poll',
+    data: requestData,
+    successCallback: resp => resp.json()
+      .then(data => pollSuccessCallBack(data, commit, state, getters)),
+    errorCallback: () => Flash('Something went wrong while fetching latest comments.'),
+  });
+
+  if (!Visibility.hidden()) {
+    eTagPoll.makeRequest();
+  } else {
+    service.poll(requestData);
+  }
+
+  Visibility.change(() => {
+    if (!Visibility.hidden()) {
+      eTagPoll.restart();
+    } else {
+      eTagPoll.stop();
+    }
+  });
+};
+
+export const fetchData = ({ commit, state, getters }) => {
+  const requestData = { endpoint: state.notesData.notesPath, lastFetchedAt: state.lastFetchedAt };
+
+  service.poll(requestData)
+    .then(resp => resp.json)
+    .then(data => pollSuccessCallBack(data, commit, state, getters))
+    .catch(() => Flash('Something went wrong while fetching latest comments.'));
+};
+
+export const toggleAward = ({ commit, state, getters, dispatch }, { awardName, noteId }) => {
+  commit(types.TOGGLE_AWARD, { awardName, note: getters.notesById[noteId] });
+};
+
+export const toggleAwardRequest = ({ commit, getters, dispatch }, data) => {
+  const { endpoint, awardName } = data;
+
+  return service
+    .toggleAward(endpoint, { name: awardName })
+    .then(res => res.json())
+    .then(() => {
+      dispatch('toggleAward', data);
+    });
+};
+
+export const scrollToNoteIfNeeded = (context, el) => {
+  if (!gl.utils.isInViewport(el[0])) {
+    gl.utils.scrollToElement(el);
+  }
+};
diff --git a/app/assets/javascripts/notes/stores/getters.js b/app/assets/javascripts/notes/stores/getters.js
new file mode 100644
index 00000000000..1f0c6af6156
--- /dev/null
+++ b/app/assets/javascripts/notes/stores/getters.js
@@ -0,0 +1,31 @@
+import _ from 'underscore';
+
+export const notes = state => state.notes;
+export const targetNoteHash = state => state.targetNoteHash;
+
+export const getNotesData = state => state.notesData;
+export const getNotesDataByProp = state => prop => state.notesData[prop];
+
+export const getIssueData = state => state.issueData;
+export const getIssueDataByProp = state => prop => state.issueData[prop];
+
+export const getUserData = state => state.userData || {};
+export const getUserDataByProp = state => prop => state.userData && state.userData[prop];
+
+export const notesById = state => state.notes.reduce((acc, note) => {
+  note.notes.every(n => Object.assign(acc, { [n.id]: n }));
+  return acc;
+}, {});
+
+const reverseNotes = array => array.slice(0).reverse();
+const isLastNote = (note, state) => !note.system &&
+  state.userData && note.author &&
+  note.author.id === state.userData.id;
+
+export const getCurrentUserLastNote = state => _.flatten(
+    reverseNotes(state.notes)
+    .map(note => reverseNotes(note.notes)),
+  ).find(el => isLastNote(el, state));
+
+export const getDiscussionLastNote = state => discussion => reverseNotes(discussion.notes)
+  .find(el => isLastNote(el, state));
diff --git a/app/assets/javascripts/notes/stores/index.js b/app/assets/javascripts/notes/stores/index.js
new file mode 100644
index 00000000000..8e0c8531bbc
--- /dev/null
+++ b/app/assets/javascripts/notes/stores/index.js
@@ -0,0 +1,23 @@
+import Vue from 'vue';
+import Vuex from 'vuex';
+import * as actions from './actions';
+import * as getters from './getters';
+import mutations from './mutations';
+
+Vue.use(Vuex);
+
+export default new Vuex.Store({
+  state: {
+    notes: [],
+    targetNoteHash: null,
+    lastFetchedAt: null,
+
+    // holds endpoints and permissions provided through haml
+    notesData: {},
+    userData: {},
+    issueData: {},
+  },
+  actions,
+  getters,
+  mutations,
+});
diff --git a/app/assets/javascripts/notes/stores/mutation_types.js b/app/assets/javascripts/notes/stores/mutation_types.js
new file mode 100644
index 00000000000..cd71533ba9d
--- /dev/null
+++ b/app/assets/javascripts/notes/stores/mutation_types.js
@@ -0,0 +1,14 @@
+export const ADD_NEW_NOTE = 'ADD_NEW_NOTE';
+export const ADD_NEW_REPLY_TO_DISCUSSION = 'ADD_NEW_REPLY_TO_DISCUSSION';
+export const DELETE_NOTE = 'DELETE_NOTE';
+export const REMOVE_PLACEHOLDER_NOTES = 'REMOVE_PLACEHOLDER_NOTES';
+export const SET_NOTES_DATA = 'SET_NOTES_DATA';
+export const SET_ISSUE_DATA = 'SET_ISSUE_DATA';
+export const SET_USER_DATA = 'SET_USER_DATA';
+export const SET_INITIAL_NOTES = 'SET_INITIAL_NOTES';
+export const SET_LAST_FETCHED_AT = 'SET_LAST_FETCHED_AT';
+export const SET_TARGET_NOTE_HASH = 'SET_TARGET_NOTE_HASH';
+export const SHOW_PLACEHOLDER_NOTE = 'SHOW_PLACEHOLDER_NOTE';
+export const TOGGLE_AWARD = 'TOGGLE_AWARD';
+export const TOGGLE_DISCUSSION = 'TOGGLE_DISCUSSION';
+export const UPDATE_NOTE = 'UPDATE_NOTE';
diff --git a/app/assets/javascripts/notes/stores/mutations.js b/app/assets/javascripts/notes/stores/mutations.js
new file mode 100644
index 00000000000..3b2b2089d6e
--- /dev/null
+++ b/app/assets/javascripts/notes/stores/mutations.js
@@ -0,0 +1,151 @@
+import * as utils from './utils';
+import * as types from './mutation_types';
+import * as constants from '../constants';
+
+export default {
+  [types.ADD_NEW_NOTE](state, note) {
+    const { discussion_id, type } = note;
+    const noteData = {
+      expanded: true,
+      id: discussion_id,
+      individual_note: !(type === constants.DISCUSSION_NOTE),
+      notes: [note],
+      reply_id: discussion_id,
+    };
+
+    state.notes.push(noteData);
+  },
+
+  [types.ADD_NEW_REPLY_TO_DISCUSSION](state, note) {
+    const noteObj = utils.findNoteObjectById(state.notes, note.discussion_id);
+
+    if (noteObj) {
+      noteObj.notes.push(note);
+    }
+  },
+
+  [types.DELETE_NOTE](state, note) {
+    const noteObj = utils.findNoteObjectById(state.notes, note.discussion_id);
+
+    if (noteObj.individual_note) {
+      state.notes.splice(state.notes.indexOf(noteObj), 1);
+    } else {
+      const comment = utils.findNoteObjectById(noteObj.notes, note.id);
+      noteObj.notes.splice(noteObj.notes.indexOf(comment), 1);
+
+      if (!noteObj.notes.length) {
+        state.notes.splice(state.notes.indexOf(noteObj), 1);
+      }
+    }
+  },
+
+  [types.REMOVE_PLACEHOLDER_NOTES](state) {
+    const { notes } = state;
+
+    for (let i = notes.length - 1; i >= 0; i -= 1) {
+      const note = notes[i];
+      const children = note.notes;
+
+      if (children.length && !note.individual_note) { // remove placeholder from discussions
+        for (let j = children.length - 1; j >= 0; j -= 1) {
+          if (children[j].isPlaceholderNote) {
+            children.splice(j, 1);
+          }
+        }
+      } else if (note.isPlaceholderNote) { // remove placeholders from state root
+        notes.splice(i, 1);
+      }
+    }
+  },
+
+  [types.SET_NOTES_DATA](state, data) {
+    Object.assign(state, { notesData: data });
+  },
+
+  [types.SET_ISSUE_DATA](state, data) {
+    Object.assign(state, { issueData: data });
+  },
+
+  [types.SET_USER_DATA](state, data) {
+    Object.assign(state, { userData: data });
+  },
+  [types.SET_INITIAL_NOTES](state, notesData) {
+    const notes = [];
+
+    notesData.forEach((note) => {
+      // To support legacy notes, should be very rare case.
+      if (note.individual_note && note.notes.length > 1) {
+        note.notes.forEach((n) => {
+          const nn = Object.assign({}, note);
+          nn.notes = [n]; // override notes array to only have one item to mimick individual_note
+          notes.push(nn);
+        });
+      } else {
+        notes.push(note);
+      }
+    });
+
+    Object.assign(state, { notes });
+  },
+
+  [types.SET_LAST_FETCHED_AT](state, fetchedAt) {
+    Object.assign(state, { lastFetchedAt: fetchedAt });
+  },
+
+  [types.SET_TARGET_NOTE_HASH](state, hash) {
+    Object.assign(state, { targetNoteHash: hash });
+  },
+
+  [types.SHOW_PLACEHOLDER_NOTE](state, data) {
+    let notesArr = state.notes;
+    if (data.replyId) {
+      notesArr = utils.findNoteObjectById(notesArr, data.replyId).notes;
+    }
+
+    notesArr.push({
+      individual_note: true,
+      isPlaceholderNote: true,
+      placeholderType: data.isSystemNote ? constants.SYSTEM_NOTE : constants.NOTE,
+      notes: [
+        {
+          body: data.noteBody,
+        },
+      ],
+    });
+  },
+
+  [types.TOGGLE_AWARD](state, data) {
+    const { awardName, note } = data;
+    const { id, name, username } = state.userData;
+
+    const hasEmojiAwardedByCurrentUser = note.award_emoji
+      .filter(emoji => emoji.name === data.awardName && emoji.user.id === id);
+
+    if (hasEmojiAwardedByCurrentUser.length) {
+      // If current user has awarded this emoji, remove it.
+      note.award_emoji.splice(note.award_emoji.indexOf(hasEmojiAwardedByCurrentUser[0]), 1);
+    } else {
+      note.award_emoji.push({
+        name: awardName,
+        user: { id, name, username },
+      });
+    }
+  },
+
+  [types.TOGGLE_DISCUSSION](state, { discussionId }) {
+    const discussion = utils.findNoteObjectById(state.notes, discussionId);
+
+    discussion.expanded = !discussion.expanded;
+  },
+
+  [types.UPDATE_NOTE](state, note) {
+    const noteObj = utils.findNoteObjectById(state.notes, note.discussion_id);
+
+    if (noteObj.individual_note) {
+      noteObj.notes.splice(0, 1, note);
+    } else {
+      const comment = utils.findNoteObjectById(noteObj.notes, note.id);
+      noteObj.notes.splice(noteObj.notes.indexOf(comment), 1, note);
+    }
+  },
+};
diff --git a/app/assets/javascripts/notes/stores/utils.js b/app/assets/javascripts/notes/stores/utils.js
new file mode 100644
index 00000000000..6074115e855
--- /dev/null
+++ b/app/assets/javascripts/notes/stores/utils.js
@@ -0,0 +1,31 @@
+import AjaxCache from '~/lib/utils/ajax_cache';
+
+const REGEX_QUICK_ACTIONS = /^\/\w+.*$/gm;
+
+export const findNoteObjectById = (notes, id) => notes.filter(n => n.id === id)[0];
+
+export const getQuickActionText = (note) => {
+  let text = 'Applying command';
+  const quickActions = AjaxCache.get(gl.GfmAutoComplete.dataSources.commands) || [];
+
+  const executedCommands = quickActions.filter((command) => {
+    const commandRegex = new RegExp(`/${command.name}`);
+    return commandRegex.test(note);
+  });
+
+  if (executedCommands && executedCommands.length) {
+    if (executedCommands.length > 1) {
+      text = 'Applying multiple commands';
+    } else {
+      const commandDescription = executedCommands[0].description.toLowerCase();
+      text = `Applying command to ${commandDescription}`;
+    }
+  }
+
+  return text;
+};
+
+export const hasQuickActions = note => REGEX_QUICK_ACTIONS.test(note);
+
+export const stripQuickActions = note => note.replace(REGEX_QUICK_ACTIONS, '').trim();
+
diff --git a/app/assets/javascripts/shortcuts_issuable.js b/app/assets/javascripts/shortcuts_issuable.js
index 0be141eb5f9..78b257bf192 100644
--- a/app/assets/javascripts/shortcuts_issuable.js
+++ b/app/assets/javascripts/shortcuts_issuable.js
@@ -20,7 +20,7 @@ import './shortcuts_navigation';
       Mousetrap.bind('m', this.openSidebarDropdown.bind(this, 'milestone'));
       Mousetrap.bind('r', (function(_this) {
         return function() {
-          _this.replyWithSelectedText();
+          _this.replyWithSelectedText(isMergeRequest);
           return false;
         };
       })(this));
@@ -38,9 +38,15 @@ import './shortcuts_navigation';
       }
     }
 
-    ShortcutsIssuable.prototype.replyWithSelectedText = function() {
+    ShortcutsIssuable.prototype.replyWithSelectedText = function(isMergeRequest) {
       var quote, documentFragment, el, selected, separator;
-      var replyField = $('.js-main-target-form #note_note');
+      let replyField;
+
+      if (isMergeRequest) {
+        replyField = $('.js-main-target-form #note_note');
+      } else {
+        replyField = $('.js-main-target-form .js-vue-comment-form');
+      }
 
       documentFragment = window.gl.utils.getSelectedFragment();
       if (!documentFragment) {
@@ -57,6 +63,7 @@ import './shortcuts_navigation';
       quote = _.map(selected.split("\n"), function(val) {
         return ("> " + val).trim() + "\n";
       });
+
       // If replyField already has some content, add a newline before our quote
       separator = replyField.val().trim() !== "" && "\n\n" || '';
       replyField.val(function(a, current) {
@@ -64,7 +71,7 @@ import './shortcuts_navigation';
       });
 
       // Trigger autosave
-      replyField.trigger('input');
+      replyField.trigger('input').trigger('change');
 
       // Trigger autosize
       var event = document.createEvent('Event');
diff --git a/app/assets/javascripts/sidebar/components/time_tracking/sidebar_time_tracking.js b/app/assets/javascripts/sidebar/components/time_tracking/sidebar_time_tracking.js
index 2d682215cf8..d32fe4abc7d 100644
--- a/app/assets/javascripts/sidebar/components/time_tracking/sidebar_time_tracking.js
+++ b/app/assets/javascripts/sidebar/components/time_tracking/sidebar_time_tracking.js
@@ -6,6 +6,7 @@ import timeTracker from './time_tracker';
 
 import Store from '../../stores/sidebar_store';
 import Mediator from '../../sidebar_mediator';
+import eventHub from '../../event_hub';
 
 export default {
   data() {
@@ -20,6 +21,9 @@ export default {
   methods: {
     listenForQuickActions() {
       $(document).on('ajax:success', '.gfm-form', this.quickActionListened);
+      eventHub.$on('timeTrackingUpdated', (data) => {
+        this.quickActionListened(null, data);
+      });
     },
     quickActionListened(e, data) {
       const subscribedCommands = ['spend_time', 'time_estimate'];
diff --git a/app/assets/javascripts/vue_shared/components/issue/confidential_issue_warning.vue b/app/assets/javascripts/vue_shared/components/issue/confidential_issue_warning.vue
new file mode 100644
index 00000000000..397d16331d5
--- /dev/null
+++ b/app/assets/javascripts/vue_shared/components/issue/confidential_issue_warning.vue
@@ -0,0 +1,16 @@
+<script>
+  export default {
+    name: 'confidentialIssueWarning',
+  };
+</script>
+<template>
+  <div class="confidential-issue-warning">
+    <i
+    aria-hidden="true"
+    class="fa fa-eye-slash">
+    </i>
+    <span>
+      This is a confidential issue. Your comment will not be visible to the public.
+    </span>
+  </div>
+</template>
diff --git a/app/assets/javascripts/vue_shared/components/markdown/field.vue b/app/assets/javascripts/vue_shared/components/markdown/field.vue
index 4e10bbc7408..759d30c9c7c 100644
--- a/app/assets/javascripts/vue_shared/components/markdown/field.vue
+++ b/app/assets/javascripts/vue_shared/components/markdown/field.vue
@@ -5,19 +5,30 @@
 
   export default {
     props: {
-      markdownPreviewUrl: {
+      markdownPreviewPath: {
         type: String,
         required: false,
         default: '',
       },
-      markdownDocs: {
+      markdownDocsPath: {
         type: String,
         required: true,
       },
+      addSpacingClasses: {
+        type: Boolean,
+        required: false,
+        default: true,
+      },
+      quickActionsDocsPath: {
+        type: String,
+        required: false,
+      },
     },
     data() {
       return {
         markdownPreview: '',
+        referencedCommands: '',
+        referencedUsers: '',
         markdownPreviewLoading: false,
         previewMarkdown: false,
       };
@@ -26,35 +37,48 @@
       markdownHeader,
       markdownToolbar,
     },
+    computed: {
+      shouldShowReferencedUsers() {
+        const referencedUsersThreshold = 10;
+        return this.referencedUsers.length >= referencedUsersThreshold;
+      },
+    },
     methods: {
       toggleMarkdownPreview() {
         this.previewMarkdown = !this.previewMarkdown;
 
+        /*
+          Can't use `$refs` as the component is technically in the parent component
+          so we access the VNode & then get the element
+        */
+        const text = this.$slots.textarea[0].elm.value;
+
         if (!this.previewMarkdown) {
           this.markdownPreview = '';
-        } else {
+        } else if (text) {
           this.markdownPreviewLoading = true;
-          this.$http.post(
-            this.markdownPreviewUrl,
-            {
-              /*
-                Can't use `$refs` as the component is technically in the parent component
-                so we access the VNode & then get the element
-              */
-              text: this.$slots.textarea[0].elm.value,
-            },
-          )
-          .then(resp => resp.json())
-          .then((data) => {
-            this.markdownPreviewLoading = false;
-            this.markdownPreview = data.body;
+          this.$http.post(this.markdownPreviewPath, { text })
+            .then(resp => resp.json())
+            .then((data) => {
+              this.renderMarkdown(data);
+            })
+            .catch(() => new Flash('Error loading markdown preview'));
+        } else {
+          this.renderMarkdown();
+        }
+      },
+      renderMarkdown(data = {}) {
+        this.markdownPreviewLoading = false;
+        this.markdownPreview = data.body || 'Nothing to preview.';
 
-            this.$nextTick(() => {
-              $(this.$refs['markdown-preview']).renderGFM();
-            });
-          })
-          .catch(() => new Flash('Error loading markdown preview'));
+        if (data.references) {
+          this.referencedCommands = data.references.commands;
+          this.referencedUsers = data.references.users;
         }
+
+        this.$nextTick(() => {
+          $(this.$refs['markdown-preview']).renderGFM();
+        });
       },
     },
     mounted() {
@@ -74,7 +98,8 @@
 
 <template>
   <div
-    class="md-area prepend-top-default append-bottom-default js-vue-markdown-field"
+    class="md-area js-vue-markdown-field"
+    :class="{ 'prepend-top-default append-bottom-default': addSpacingClasses }"
     ref="gl-form">
     <markdown-header
       :preview-markdown="previewMarkdown"
@@ -94,7 +119,9 @@
           </i>
         </a>
         <markdown-toolbar
-          :markdown-docs="markdownDocs" />
+          :markdown-docs-path="markdownDocsPath"
+          :quick-actions-docs-path="quickActionsDocsPath"
+          />
       </div>
     </div>
     <div
@@ -108,5 +135,27 @@
         Loading...
       </span>
     </div>
+    <template v-if="previewMarkdown && !markdownPreviewLoading">
+      <div
+        v-if="referencedCommands"
+        v-html="referencedCommands"
+        class="referenced-commands"></div>
+      <div
+        v-if="shouldShowReferencedUsers"
+        class="referenced-users">
+          <span>
+            <i
+              class="fa fa-exclamation-triangle"
+              aria-hidden="true">
+            </i>
+            You are about to add
+            <strong>
+              <span class="js-referenced-users-count">
+                {{referencedUsers.length}}
+              </span>
+            </strong> people to the discussion. Proceed with caution.
+          </span>
+        </div>
+    </template>
   </div>
 </template>
diff --git a/app/assets/javascripts/vue_shared/components/markdown/toolbar.vue b/app/assets/javascripts/vue_shared/components/markdown/toolbar.vue
index 93252293ba6..65fe7bbd94e 100644
--- a/app/assets/javascripts/vue_shared/components/markdown/toolbar.vue
+++ b/app/assets/javascripts/vue_shared/components/markdown/toolbar.vue
@@ -1,10 +1,14 @@
 <script>
   export default {
     props: {
-      markdownDocs: {
+      markdownDocsPath: {
         type: String,
         required: true,
       },
+      quickActionsDocsPath: {
+        type: String,
+        required: false,
+      },
     },
   };
 </script>
@@ -12,22 +16,77 @@
 <template>
   <div class="comment-toolbar clearfix">
     <div class="toolbar-text">
-      <a
-        :href="markdownDocs"
-        target="_blank"
-        tabindex="-1">
-        Markdown is supported
-      </a>
+      <template v-if="!quickActionsDocsPath && markdownDocsPath">
+        <a
+          :href="markdownDocsPath"
+          target="_blank"
+          tabindex="-1">
+          Markdown is supported
+        </a>
+      </template>
+      <template v-if="quickActionsDocsPath && markdownDocsPath">
+         <a
+          :href="markdownDocsPath"
+          target="_blank"
+          tabindex="-1">
+          Markdown
+        </a>
+        and
+         <a
+          :href="quickActionsDocsPath"
+          target="_blank"
+          tabindex="-1">
+          quick actions
+        </a>
+        are supported
+      </template>
     </div>
-    <button
-      class="toolbar-button markdown-selector"
-      type="button"
-      tabindex="-1">
-      <i
-        class="fa fa-file-image-o toolbar-button-icon"
-        aria-hidden="true">
-      </i>
-      Attach a file
-    </button>
+    <span class="uploading-container">
+      <span class="uploading-progress-container hide">
+        <i
+          class="fa fa-file-image-o toolbar-button-icon"
+          aria-hidden="true"></i>
+        <span class="attaching-file-message"></span>
+        <span class="uploading-progress">0%</span>
+        <span class="uploading-spinner">
+          <i
+            class="fa fa-spinner fa-spin toolbar-button-icon"
+            aria-hidden="true"></i>
+        </span>
+      </span>
+      <span class="uploading-error-container hide">
+        <span class="uploading-error-icon">
+          <i
+            class="fa fa-file-image-o toolbar-button-icon"
+            aria-hidden="true"></i>
+        </span>
+        <span class="uploading-error-message"></span>
+        <button
+          class="retry-uploading-link"
+          type="button">
+            Try again
+        </button>
+        or
+        <button
+          class="attach-new-file markdown-selector"
+          type="button">
+          attach a new file
+        </button>
+      </span>
+      <button
+        class="markdown-selector button-attach-file"
+        tabindex="-1"
+        type="button">
+        <i
+          class="fa fa-file-image-o toolbar-button-icon"
+          aria-hidden="true"></i>
+        Attach a file
+      </button>
+      <button
+        class="btn btn-default btn-xs hide button-cancel-uploading-files"
+        type="button">
+        Cancel
+      </button>
+    </span>
   </div>
 </template>
diff --git a/app/assets/stylesheets/framework/dropdowns.scss b/app/assets/stylesheets/framework/dropdowns.scss
index a49f9f99872..110b171676a 100644
--- a/app/assets/stylesheets/framework/dropdowns.scss
+++ b/app/assets/stylesheets/framework/dropdowns.scss
@@ -368,6 +368,10 @@
   transform: translateY(0);
 }
 
+.comment-type-dropdown.open .dropdown-menu {
+  display: block;
+}
+
 .filtered-search-box-input-container {
   .dropdown-menu,
   .dropdown-menu-nav {
diff --git a/app/assets/stylesheets/pages/issuable.scss b/app/assets/stylesheets/pages/issuable.scss
index ab5a901da71..4b0b238a767 100644
--- a/app/assets/stylesheets/pages/issuable.scss
+++ b/app/assets/stylesheets/pages/issuable.scss
@@ -498,6 +498,7 @@
   color: $gray-darkest;
   display: block;
   margin: 16px 0 0;
+  font-size: 85%;
 
   .author_link {
     color: $gray-darkest;
diff --git a/app/assets/stylesheets/pages/issues.scss b/app/assets/stylesheets/pages/issues.scss
index e2177f96aee..518bb270b88 100644
--- a/app/assets/stylesheets/pages/issues.scss
+++ b/app/assets/stylesheets/pages/issues.scss
@@ -250,6 +250,10 @@ ul.related-merge-requests > li {
   }
 }
 
+.discussion-reply-holder .note-edit-form {
+  display: block;
+}
+
 @media (min-width: $screen-sm-min) {
   .emoji-block .row {
     display: flex;
diff --git a/app/assets/stylesheets/pages/note_form.scss b/app/assets/stylesheets/pages/note_form.scss
index 9558924bbcb..8932cff22a8 100644
--- a/app/assets/stylesheets/pages/note_form.scss
+++ b/app/assets/stylesheets/pages/note_form.scss
@@ -20,10 +20,6 @@
   }
 }
 
-.new-note {
-  display: none;
-}
-
 .new-note,
 .note-edit-form {
   .note-form-actions {
@@ -202,6 +198,10 @@
   .discussion-reply-holder {
     background-color: $white-light;
     padding: 10px 16px;
+
+    &.is-replying {
+      padding-bottom: $gl-padding;
+    }
   }
 }
 
diff --git a/app/assets/stylesheets/pages/notes.scss b/app/assets/stylesheets/pages/notes.scss
index fbfe5d3c682..764984c5772 100644
--- a/app/assets/stylesheets/pages/notes.scss
+++ b/app/assets/stylesheets/pages/notes.scss
@@ -100,6 +100,20 @@ ul.notes {
       }
     }
 
+    .editing-spinner {
+      display: none;
+    }
+
+    &.is-requesting {
+      .note-timestamp {
+        display: none;
+      }
+
+      .editing-spinner {
+        display: inline-block;
+      }
+    }
+
     &.is-editing {
       .note-header,
       .note-text,
@@ -402,6 +416,10 @@ ul.notes {
 .note-header-info {
   min-width: 0;
   padding-bottom: 8px;
+
+  &.discussion {
+    padding-bottom: 0;
+  }
 }
 
 .system-note .note-header-info {
@@ -814,10 +832,6 @@ ul.notes {
   }
 }
 
-.discussion-notes .flash-container {
-  margin-bottom: 0;
-}
-
 // Merge request notes in diffs
 .diff-file {
   // Diff is inline
diff --git a/app/controllers/concerns/notes_actions.rb b/app/controllers/concerns/notes_actions.rb
index af5f683bab5..18fd8eb114d 100644
--- a/app/controllers/concerns/notes_actions.rb
+++ b/app/controllers/concerns/notes_actions.rb
@@ -3,6 +3,7 @@ module NotesActions
   extend ActiveSupport::Concern
 
   included do
+    before_action :set_polling_interval_header, only: [:index]
     before_action :authorize_admin_note!, only: [:update, :destroy]
     before_action :note_project, only: [:create]
   end
@@ -12,14 +13,18 @@ module NotesActions
 
     notes_json = { notes: [], last_fetched_at: current_fetched_at }
 
-    @notes = notes_finder.execute.inc_relations_for_view
-    @notes = prepare_notes_for_rendering(@notes)
+    notes = notes_finder.execute
+      .inc_relations_for_view
+      .reject { |n| n.cross_reference_not_visible_for?(current_user) }
 
-    @notes.each do |note|
-      next if note.cross_reference_not_visible_for?(current_user)
+    notes = prepare_notes_for_rendering(notes)
 
-      notes_json[:notes] << note_json(note)
-    end
+    notes_json[:notes] =
+      if noteable.discussions_rendered_on_frontend?
+        note_serializer.represent(notes)
+      else
+        notes.map { |note| note_json(note) }
+      end
 
     render json: notes_json
   end
@@ -82,22 +87,27 @@ module NotesActions
     }
 
     if note.persisted?
-      attrs.merge!(
-        valid: true,
-        id: note.id,
-        discussion_id: note.discussion_id(noteable),
-        html: note_html(note),
-        note: note.note
-      )
+      attrs[:valid] = true
 
-      discussion = note.to_discussion(noteable)
-      unless discussion.individual_note?
+      if noteable.nil? || noteable.discussions_rendered_on_frontend?
+        attrs.merge!(note_serializer.represent(note))
+      else
         attrs.merge!(
-          discussion_resolvable: discussion.resolvable?,
-
-          diff_discussion_html: diff_discussion_html(discussion),
-          discussion_html: discussion_html(discussion)
+          id: note.id,
+          discussion_id: note.discussion_id(noteable),
+          html: note_html(note),
+          note: note.note
         )
+
+        discussion = note.to_discussion(noteable)
+        unless discussion.individual_note?
+          attrs.merge!(
+            discussion_resolvable: discussion.resolvable?,
+
+            diff_discussion_html: diff_discussion_html(discussion),
+            discussion_html: discussion_html(discussion)
+          )
+        end
       end
     else
       attrs.merge!(
@@ -168,6 +178,10 @@ module NotesActions
     )
   end
 
+  def set_polling_interval_header
+    Gitlab::PollingInterval.set_header(response, interval: 6_000)
+  end
+
   def noteable
     @noteable ||= notes_finder.target
   end
@@ -180,6 +194,10 @@ module NotesActions
     @notes_finder ||= NotesFinder.new(project, current_user, finder_params)
   end
 
+  def note_serializer
+    NoteSerializer.new(project: project, noteable: noteable, current_user: current_user)
+  end
+
   def note_project
     return @note_project if defined?(@note_project)
     return nil unless project
diff --git a/app/controllers/projects/issues_controller.rb b/app/controllers/projects/issues_controller.rb
index 1afaceac567..349b19f72e2 100644
--- a/app/controllers/projects/issues_controller.rb
+++ b/app/controllers/projects/issues_controller.rb
@@ -91,11 +91,25 @@ class Projects::IssuesController < Projects::ApplicationController
     respond_to do |format|
       format.html
       format.json do
-        render json: IssueSerializer.new.represent(@issue)
+        render json: serializer.represent(@issue)
       end
     end
   end
 
+  def discussions
+    notes = @issue.notes
+      .inc_relations_for_view
+      .includes(:noteable)
+      .fresh
+      .reject { |n| n.cross_reference_not_visible_for?(current_user) }
+
+    prepare_notes_for_rendering(notes)
+
+    discussions = Discussion.build_collection(notes, @issue)
+
+    render json: DiscussionSerializer.new(project: @project, noteable: @issue, current_user: current_user).represent(discussions)
+  end
+
   def create
     create_params = issue_params.merge(spammable_params).merge(
       merge_request_to_resolve_discussions_of: params[:merge_request_to_resolve_discussions_of],
@@ -143,7 +157,7 @@ class Projects::IssuesController < Projects::ApplicationController
 
       format.json do
         if @issue.valid?
-          render json: IssueSerializer.new.represent(@issue)
+          render json: serializer.represent(@issue)
         else
           render json: { errors: @issue.errors.full_messages }, status: :unprocessable_entity
         end
@@ -287,4 +301,8 @@ class Projects::IssuesController < Projects::ApplicationController
 
     redirect_to new_user_session_path, notice: notice
   end
+
+  def serializer
+    IssueSerializer.new(current_user: current_user, project: issue.project)
+  end
 end
diff --git a/app/helpers/issuables_helper.rb b/app/helpers/issuables_helper.rb
index f4d452b3c9b..0fcd3347095 100644
--- a/app/helpers/issuables_helper.rb
+++ b/app/helpers/issuables_helper.rb
@@ -35,7 +35,7 @@ module IssuablesHelper
   def serialize_issuable(issuable)
     case issuable
     when Issue
-      IssueSerializer.new.represent(issuable).to_json
+      IssueSerializer.new(current_user: current_user, project: issuable.project).represent(issuable).to_json
     when MergeRequest
       MergeRequestSerializer
         .new(current_user: current_user, project: issuable.project)
@@ -210,9 +210,9 @@ module IssuablesHelper
       canMove: current_user ? issuable.can_move?(current_user) : false,
       issuableRef: issuable.to_reference,
       isConfidential: issuable.confidential,
-      markdownPreviewUrl: preview_markdown_path(@project),
-      markdownDocs: help_page_path('user/markdown'),
-      projectsAutocompleteUrl: autocomplete_projects_path(project_id: @project.id),
+      markdownPreviewPath: preview_markdown_path(@project),
+      markdownDocsPath: help_page_path('user/markdown'),
+      projectsAutocompletePath: autocomplete_projects_path(project_id: @project.id),
       issuableTemplates: issuable_templates(issuable),
       projectPath: ref_project.path,
       projectNamespace: ref_project.namespace.full_path,
diff --git a/app/helpers/issues_helper.rb b/app/helpers/issues_helper.rb
index 7e1ccb23e9e..853ce827061 100644
--- a/app/helpers/issues_helper.rb
+++ b/app/helpers/issues_helper.rb
@@ -137,7 +137,7 @@ module IssuesHelper
   end
 
   def awards_sort(awards)
-    awards.sort_by do |award, notes|
+    awards.sort_by do |award, award_emojis|
       if award == "thumbsup"
         0
       elsif award == "thumbsdown"
diff --git a/app/helpers/notes_helper.rb b/app/helpers/notes_helper.rb
index e857e837c16..8c5e258f519 100644
--- a/app/helpers/notes_helper.rb
+++ b/app/helpers/notes_helper.rb
@@ -93,11 +93,13 @@ module NotesHelper
     end
   end
 
-  def notes_url
+  def notes_url(params = {})
     if @snippet.is_a?(PersonalSnippet)
-      snippet_notes_path(@snippet)
+      snippet_notes_path(@snippet, params)
     else
-      project_noteable_notes_path(@project, target_id: @noteable.id, target_type: @noteable.class.name.underscore)
+      params.merge!(target_id: @noteable.id, target_type: @noteable.class.name.underscore)
+
+      project_noteable_notes_path(@project, params)
     end
   end
 
diff --git a/app/helpers/system_note_helper.rb b/app/helpers/system_note_helper.rb
index 08fd97cd048..c98f65c7644 100644
--- a/app/helpers/system_note_helper.rb
+++ b/app/helpers/system_note_helper.rb
@@ -22,8 +22,14 @@ module SystemNoteHelper
     'duplicate' => 'icon_clone'
   }.freeze
 
+  def system_note_icon_name(note)
+    ICON_NAMES_BY_ACTION[note.system_note_metadata&.action]
+  end
+
   def icon_for_system_note(note)
-    icon_name = ICON_NAMES_BY_ACTION[note.system_note_metadata&.action]
+    icon_name = system_note_icon_name(note)
     custom_icon(icon_name) if icon_name
   end
+
+  extend self
 end
diff --git a/app/models/award_emoji.rb b/app/models/award_emoji.rb
index 91b62dabbcd..4d1a15c53aa 100644
--- a/app/models/award_emoji.rb
+++ b/app/models/award_emoji.rb
@@ -17,6 +17,9 @@ class AwardEmoji < ActiveRecord::Base
   scope :downvotes, -> { where(name: DOWNVOTE_NAME) }
   scope :upvotes,   -> { where(name: UPVOTE_NAME) }
 
+  after_save :expire_etag_cache
+  after_destroy :expire_etag_cache
+
   class << self
     def votes_for_collection(ids, type)
       select('name', 'awardable_id', 'COUNT(*) as count')
@@ -32,4 +35,8 @@ class AwardEmoji < ActiveRecord::Base
   def upvote?
     self.name == UPVOTE_NAME
   end
+
+  def expire_etag_cache
+    awardable.try(:expire_etag_cache)
+  end
 end
diff --git a/app/models/concerns/noteable.rb b/app/models/concerns/noteable.rb
index c7bdc997eca..1c4ddabcad5 100644
--- a/app/models/concerns/noteable.rb
+++ b/app/models/concerns/noteable.rb
@@ -24,6 +24,10 @@ module Noteable
     DiscussionNote::NOTEABLE_TYPES.include?(base_class_name)
   end
 
+  def discussions_rendered_on_frontend?
+    false
+  end
+
   def discussion_notes
     notes
   end
@@ -38,7 +42,7 @@ module Noteable
 
   def grouped_diff_discussions(*args)
     # Doesn't use `discussion_notes`, because this may include commit diff notes
-    # besides MR diff notes, that we do no want to display on the MR Changes tab.
+    # besides MR diff notes, that we do not want to display on the MR Changes tab.
     notes.inc_relations_for_view.grouped_diff_discussions(*args)
   end
 
diff --git a/app/models/discussion.rb b/app/models/discussion.rb
index d1cec7613af..b80da7b246a 100644
--- a/app/models/discussion.rb
+++ b/app/models/discussion.rb
@@ -81,6 +81,10 @@ class Discussion
     last_note.author
   end
 
+  def updated?
+    last_updated_at != created_at
+  end
+
   def id
     first_note.discussion_id(context_noteable)
   end
diff --git a/app/models/issue.rb b/app/models/issue.rb
index dfcd4030ec3..8c7d492e605 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -269,6 +269,10 @@ class Issue < ActiveRecord::Base
     end
   end
 
+  def discussions_rendered_on_frontend?
+    true
+  end
+
   def update_project_counter_caches?
     state_changed? || confidential_changed?
   end
diff --git a/app/models/note.rb b/app/models/note.rb
index a752c897d63..1073c115630 100644
--- a/app/models/note.rb
+++ b/app/models/note.rb
@@ -299,6 +299,17 @@ class Note < ActiveRecord::Base
     end
   end
 
+  def expire_etag_cache
+    return unless noteable&.discussions_rendered_on_frontend?
+
+    key = Gitlab::Routing.url_helpers.project_noteable_notes_path(
+      project,
+      target_type: noteable_type.underscore,
+      target_id: noteable_id
+    )
+    Gitlab::EtagCaching::Store.new.touch(key)
+  end
+
   private
 
   def keep_around_commit
@@ -326,15 +337,4 @@ class Note < ActiveRecord::Base
   def set_discussion_id
     self.discussion_id ||= discussion_class.discussion_id(self)
   end
-
-  def expire_etag_cache
-    return unless for_issue?
-
-    key = Gitlab::Routing.url_helpers.project_noteable_notes_path(
-      noteable.project,
-      target_type: noteable_type.underscore,
-      target_id: noteable.id
-    )
-    Gitlab::EtagCaching::Store.new.touch(key)
-  end
 end
diff --git a/app/serializers/award_emoji_entity.rb b/app/serializers/award_emoji_entity.rb
new file mode 100644
index 00000000000..6e03cd02392
--- /dev/null
+++ b/app/serializers/award_emoji_entity.rb
@@ -0,0 +1,4 @@
+class AwardEmojiEntity < Grape::Entity
+  expose :name
+  expose :user, using: API::Entities::UserSafe
+end
diff --git a/app/serializers/discussion_entity.rb b/app/serializers/discussion_entity.rb
new file mode 100644
index 00000000000..0a92e3f8167
--- /dev/null
+++ b/app/serializers/discussion_entity.rb
@@ -0,0 +1,10 @@
+class DiscussionEntity < Grape::Entity
+  include RequestAwareEntity
+
+  expose :id, :reply_id
+  expose :expanded?, as: :expanded
+
+  expose :notes, using: NoteEntity
+
+  expose :individual_note?, as: :individual_note
+end
diff --git a/app/serializers/discussion_serializer.rb b/app/serializers/discussion_serializer.rb
new file mode 100644
index 00000000000..ed5e1224bb2
--- /dev/null
+++ b/app/serializers/discussion_serializer.rb
@@ -0,0 +1,3 @@
+class DiscussionSerializer < BaseSerializer
+  entity DiscussionEntity
+end
diff --git a/app/serializers/issuable_entity.rb b/app/serializers/issuable_entity.rb
index bd5211b8e58..61c7a428745 100644
--- a/app/serializers/issuable_entity.rb
+++ b/app/serializers/issuable_entity.rb
@@ -15,4 +15,6 @@ class IssuableEntity < Grape::Entity
   expose :total_time_spent
   expose :human_time_estimate
   expose :human_total_time_spent
+  expose :milestone, using: API::Entities::Milestone
+  expose :labels, using: LabelEntity
 end
diff --git a/app/serializers/issue_entity.rb b/app/serializers/issue_entity.rb
index c189a4992da..0d6feb78173 100644
--- a/app/serializers/issue_entity.rb
+++ b/app/serializers/issue_entity.rb
@@ -7,10 +7,26 @@ class IssueEntity < IssuableEntity
   expose :due_date
   expose :moved_to_id
   expose :project_id
-  expose :milestone, using: API::Entities::Milestone
-  expose :labels, using: LabelEntity
 
   expose :web_url do |issue|
     project_issue_path(issue.project, issue)
   end
+
+  expose :current_user do
+    expose :can_create_note do |issue|
+      can?(request.current_user, :create_note, issue.project)
+    end
+
+    expose :can_update do |issue|
+      can?(request.current_user, :update_issue, issue)
+    end
+  end
+
+  expose :create_note_path do |issue|
+    project_notes_path(issue.project, target_type: 'issue', target_id: issue.id)
+  end
+
+  expose :preview_note_path do |issue|
+    preview_markdown_path(issue.project, quick_actions_target_type: 'Issue', quick_actions_target_id: issue.id)
+  end
 end
diff --git a/app/serializers/note_attachment_entity.rb b/app/serializers/note_attachment_entity.rb
new file mode 100644
index 00000000000..1ad50568ab9
--- /dev/null
+++ b/app/serializers/note_attachment_entity.rb
@@ -0,0 +1,5 @@
+class NoteAttachmentEntity < Grape::Entity
+  expose :url
+  expose :filename
+  expose :image?, as: :image
+end
diff --git a/app/serializers/note_entity.rb b/app/serializers/note_entity.rb
new file mode 100644
index 00000000000..7d50e0ff10d
--- /dev/null
+++ b/app/serializers/note_entity.rb
@@ -0,0 +1,60 @@
+class NoteEntity < API::Entities::Note
+  include RequestAwareEntity
+
+  expose :type
+
+  expose :author, using: NoteUserEntity
+
+  expose :human_access do |note|
+    note.project.team.human_max_access(note.author_id)
+  end
+
+  unexpose :note, as: :body
+  expose :note
+
+  expose :redacted_note_html, as: :note_html
+
+  expose :last_edited_at, if: -> (note, _) { note.edited? }
+  expose :last_edited_by, using: NoteUserEntity, if: -> (note, _) { note.edited? }
+
+  expose :current_user do
+    expose :can_edit do |note|
+      Ability.can_edit_note?(request.current_user, note)
+    end
+  end
+
+  expose :system_note_icon_name, if: -> (note, _) { note.system? } do |note|
+    SystemNoteHelper.system_note_icon_name(note)
+  end
+
+  expose :discussion_id do |note|
+    note.discussion_id(request.noteable)
+  end
+
+  expose :emoji_awardable?, as: :emoji_awardable
+  expose :award_emoji, if: -> (note, _) { note.emoji_awardable? }, using: AwardEmojiEntity
+  expose :toggle_award_path, if: -> (note, _) { note.emoji_awardable? } do |note|
+    if note.for_personal_snippet?
+      toggle_award_emoji_snippet_note_path(note.noteable, note)
+    else
+      toggle_award_emoji_project_note_path(note.project, note.id)
+    end
+  end
+
+  expose :report_abuse_path do |note|
+    new_abuse_report_path(user_id: note.author.id, ref_url: Gitlab::UrlBuilder.build(note))
+  end
+
+  expose :path do |note|
+    if note.for_personal_snippet?
+      snippet_note_path(note.noteable, note)
+    else
+      project_note_path(note.project, note)
+    end
+  end
+
+  expose :attachment, using: NoteAttachmentEntity, if: -> (note, _) { note.attachment? }
+  expose :delete_attachment_path, if: -> (note, _) { note.attachment? } do |note|
+    delete_attachment_project_note_path(note.project, note)
+  end
+end
diff --git a/app/serializers/note_serializer.rb b/app/serializers/note_serializer.rb
new file mode 100644
index 00000000000..2afe40d7a34
--- /dev/null
+++ b/app/serializers/note_serializer.rb
@@ -0,0 +1,3 @@
+class NoteSerializer < BaseSerializer
+  entity NoteEntity
+end
diff --git a/app/serializers/note_user_entity.rb b/app/serializers/note_user_entity.rb
new file mode 100644
index 00000000000..7289f3a0222
--- /dev/null
+++ b/app/serializers/note_user_entity.rb
@@ -0,0 +1,3 @@
+class NoteUserEntity < UserEntity
+  unexpose :web_url
+end
diff --git a/app/serializers/user_serializer.rb b/app/serializers/user_serializer.rb
new file mode 100644
index 00000000000..49a71ebac61
--- /dev/null
+++ b/app/serializers/user_serializer.rb
@@ -0,0 +1,3 @@
+class UserSerializer < BaseSerializer
+  entity UserEntity
+end
diff --git a/app/views/discussions/_headline.html.haml b/app/views/discussions/_headline.html.haml
index c1dabeed387..25e90924413 100644
--- a/app/views/discussions/_headline.html.haml
+++ b/app/views/discussions/_headline.html.haml
@@ -5,7 +5,7 @@
       by
       = link_to_member(@project, discussion.resolved_by, avatar: false)
     = time_ago_with_tooltip(discussion.resolved_at, placement: "bottom")
-- elsif discussion.last_updated_at != discussion.created_at
+- elsif discussion.updated?
   .discussion-headline-light.js-discussion-headline
     Last updated
     - if discussion.last_updated_by
diff --git a/app/views/projects/_md_preview.html.haml b/app/views/projects/_md_preview.html.haml
index 97041b87c48..71424593f2e 100644
--- a/app/views/projects/_md_preview.html.haml
+++ b/app/views/projects/_md_preview.html.haml
@@ -1,10 +1,5 @@
 - referenced_users = local_assigns.fetch(:referenced_users, nil)
 
-- if defined?(@issue) && @issue.confidential?
-  .confidential-issue-warning
-    = confidential_icon(@issue)
-    %span This is a confidential issue. Your comment will not be visible to the public.
-
 .md-area
   .md-header
     %ul.nav-links.clearfix
diff --git a/app/views/projects/issues/_discussion.html.haml b/app/views/projects/issues/_discussion.html.haml
index 8b095f4ca10..483f28c74f2 100644
--- a/app/views/projects/issues/_discussion.html.haml
+++ b/app/views/projects/issues/_discussion.html.haml
@@ -1,7 +1,17 @@
+- @gfm_form = true
+
 - content_for :note_actions do
   - if can?(current_user, :update_issue, @issue)
     = link_to 'Reopen issue', issue_path(@issue, issue: {state_event: :reopen}, format: 'json'), data: {original_text: "Reopen issue", alternative_text: "Comment & reopen issue"}, class: "btn btn-nr btn-reopen btn-comment js-note-target-reopen #{issue_button_visibility(@issue, false)}", title: 'Reopen issue'
     = link_to 'Close issue', issue_path(@issue, issue: {state_event: :close}, format: 'json'), data: {original_text: "Close issue", alternative_text: "Comment & close issue"}, class: "btn btn-nr btn-close btn-comment js-note-target-close #{issue_button_visibility(@issue, true)}", title: 'Close issue'
 
-#notes
-  = render 'shared/notes/notes_with_form', :autocomplete => true
+%section.js-vue-notes-event
+  #js-vue-notes{ data: { discussions_path: discussions_project_issue_path(@project, @issue, format: :json),
+  register_path: new_session_path(:user, redirect_to_referer: 'yes', anchor: 'register-pane'),
+  new_session_path: new_session_path(:user, redirect_to_referer: 'yes'),
+  markdown_docs_path: help_page_path('user/markdown'),
+  quick_actions_docs_path: help_page_path('user/project/quick_actions'),
+  notes_path: notes_url,
+  last_fetched_at: Time.now.to_i,
+  issue_data: serialize_issuable(@issue),
+  current_user_data: UserSerializer.new.represent(current_user).to_json } }
diff --git a/app/views/projects/issues/show.html.haml b/app/views/projects/issues/show.html.haml
index de0f1de057d..fd7ff176c5e 100644
--- a/app/views/projects/issues/show.html.haml
+++ b/app/views/projects/issues/show.html.haml
@@ -2,6 +2,11 @@
 - page_title           "#{@issue.title} (#{@issue.to_reference})", "Issues"
 - page_description     @issue.description
 - page_card_attributes @issue.card_attributes
+
+- content_for :page_specific_javascripts do
+  = webpack_bundle_tag 'common_vue'
+  = webpack_bundle_tag 'notes'
+
 - can_update_issue = can?(current_user, :update_issue, @issue)
 - can_report_spam = @issue.submittable_as_spam_by?(current_user)
 
@@ -23,7 +28,7 @@
         = icon('eye-slash', class: 'is-confidential')
       = issuable_meta(@issue, @project, "Issue")
 
-  .issuable-actions
+  .issuable-actions.js-issuable-actions
     .clearfix.issue-btn-group.dropdown
       %button.btn.btn-default.pull-left.hidden-md.hidden-lg{ type: "button", data: { toggle: "dropdown" } }
         Options
@@ -36,8 +41,8 @@
           - if @issue.author && current_user != @issue.author
             %li= link_to 'Report abuse', new_abuse_report_path(user_id: @issue.author.id, ref_url: issue_url(@issue))
           - if can_update_issue
-            %li= link_to 'Close issue', issue_path(@issue, issue: { state_event: :close }, format: 'json'), class: "btn-close #{issue_button_visibility(@issue, true)}", title: 'Close issue'
-            %li= link_to 'Reopen issue', issue_path(@issue, issue: { state_event: :reopen }, format: 'json'), class: "btn-reopen #{issue_button_visibility(@issue, false)}", title: 'Reopen issue'
+            %li= link_to 'Close issue', issue_path(@issue, issue: { state_event: :close }, format: 'json'), class: "btn-close js-btn-issue-action #{issue_button_visibility(@issue, true)}", title: 'Close issue'
+            %li= link_to 'Reopen issue', issue_path(@issue, issue: { state_event: :reopen }, format: 'json'), class: "btn-reopen js-btn-issue-action #{issue_button_visibility(@issue, false)}", title: 'Reopen issue'
           - if can_report_spam
             %li= link_to 'Submit as spam', mark_as_spam_project_issue_path(@project, @issue), method: :post, class: 'btn-spam', title: 'Submit as spam'
           - if can_update_issue || can_report_spam
@@ -74,7 +79,7 @@
 
   .content-block.emoji-block
     .row
-      .col-sm-8
+      .col-sm-8.js-issue-note-awards
         = render 'award_emoji/awards_block', awardable: @issue, inline: true
       .col-sm-4.new-branch-col
         = render 'new_branch' unless @issue.confidential?
diff --git a/app/views/projects/merge_requests/_mr_title.html.haml b/app/views/projects/merge_requests/_mr_title.html.haml
index a2e819fb3a7..f3c44c94a5c 100644
--- a/app/views/projects/merge_requests/_mr_title.html.haml
+++ b/app/views/projects/merge_requests/_mr_title.html.haml
@@ -17,7 +17,7 @@
     .issuable-meta
       = issuable_meta(@merge_request, @project, "Merge request")
 
-  .issuable-actions
+  .issuable-actions.js-issuable-actions
     .clearfix.issue-btn-group.dropdown
       %button.btn.btn-default.pull-left.hidden-md.hidden-lg{ type: "button", data: { toggle: "dropdown" } }
         Options
diff --git a/app/views/shared/issuable/_close_reopen_button.html.haml b/app/views/shared/issuable/_close_reopen_button.html.haml
index f22b6c9a6c2..cb706d80f23 100644
--- a/app/views/shared/issuable/_close_reopen_button.html.haml
+++ b/app/views/shared/issuable/_close_reopen_button.html.haml
@@ -4,9 +4,9 @@
 
 - if can_update && is_current_user
   = link_to "Close #{display_issuable_type}", close_issuable_url(issuable), method: button_method,
-            class: "hidden-xs hidden-sm btn btn-grouped btn-close #{issuable_button_visibility(issuable, true)}", title: "Close #{display_issuable_type}"
+            class: "hidden-xs hidden-sm btn btn-grouped btn-close js-btn-issue-action #{issuable_button_visibility(issuable, true)}", title: "Close #{display_issuable_type}"
   = link_to "Reopen #{display_issuable_type}", reopen_issuable_url(issuable), method: button_method,
-            class: "hidden-xs hidden-sm btn btn-grouped btn-reopen #{issuable_button_visibility(issuable, false)}", title: "Reopen #{display_issuable_type}"
+            class: "hidden-xs hidden-sm btn btn-grouped btn-reopen js-btn-issue-action #{issuable_button_visibility(issuable, false)}", title: "Reopen #{display_issuable_type}"
 - elsif can_update && !is_current_user
   = render 'shared/issuable/close_reopen_report_toggle', issuable: issuable
 - elsif issuable.author
diff --git a/app/views/shared/issuable/_close_reopen_report_toggle.html.haml b/app/views/shared/issuable/_close_reopen_report_toggle.html.haml
index daa05990ae9..d8144a39b23 100644
--- a/app/views/shared/issuable/_close_reopen_report_toggle.html.haml
+++ b/app/views/shared/issuable/_close_reopen_report_toggle.html.haml
@@ -2,7 +2,7 @@
 - button_action = issuable.closed? ? 'reopen' : 'close'
 - display_button_action = button_action.capitalize
 - button_responsive_class = 'hidden-xs hidden-sm'
-- button_class = "#{button_responsive_class} btn btn-grouped js-issuable-close-button issuable-close-button"
+- button_class = "#{button_responsive_class} btn btn-grouped js-issuable-close-button js-btn-issue-action issuable-close-button"
 - toggle_class = "#{button_responsive_class} btn btn-nr dropdown-toggle js-issuable-close-toggle"
 - button_method = issuable_close_reopen_button_method(issuable)
 
diff --git a/app/views/shared/notes/_notes_with_form.html.haml b/app/views/shared/notes/_notes_with_form.html.haml
index eae04c9bbb8..e3e86709b8f 100644
--- a/app/views/shared/notes/_notes_with_form.html.haml
+++ b/app/views/shared/notes/_notes_with_form.html.haml
@@ -17,9 +17,9 @@
 - elsif !current_user
   .disabled-comment.text-center.prepend-top-default
     Please
-    = link_to "register", new_session_path(:user, redirect_to_referer: 'yes')
+    = link_to "register", new_session_path(:user, redirect_to_referer: 'yes', anchor: 'register-pane'), class: 'js-register-link'
     or
-    = link_to "sign in", new_session_path(:user, redirect_to_referer: 'yes')
+    = link_to "sign in", new_session_path(:user, redirect_to_referer: 'yes'), class: 'js-sign-in-link'
     to comment
 
 %script.js-notes-data{ type: "application/json" }= initial_notes_data(autocomplete).to_json.html_safe