Add latest changes from gitlab-org/gitlab@master

1 files changed, 26 insertions, 0 deletions

diff --git a/app/assets/javascripts/lib/utils/ignore_while_pending.js b/app/assets/javascripts/lib/utils/ignore_while_pending.js
new file mode 100644
index 00000000000..e85a573c8f2
--- /dev/null
+++ b/app/assets/javascripts/lib/utils/ignore_while_pending.js
@@ -0,0 +1,26 @@
+/**
+ * This will wrap the given function to make sure that it is only triggered once
+ * while executing asynchronously
+ *
+ * @param {Function} fn some function that returns a promise
+ * @returns A function that will only be triggered *once* while the promise is executing
+ */
+export const ignoreWhilePending = (fn) => {
+  const isPendingMap = new WeakMap();
+  const defaultContext = {};
+
+  // We need this to be a function so we get the `this`
+  return function ignoreWhilePendingInner(...args) {
+    const context = this || defaultContext;
+
+    if (isPendingMap.get(context)) {
+      return Promise.resolve();
+    }
+
+    isPendingMap.set(context, true);
+
+    return fn.apply(this, args).finally(() => {
+      isPendingMap.delete(context);
+    });
+  };
+};