tools: update ESLint to 7.30.0

Update ESLint to 7.30.0

PR-URL: https://github.com/nodejs/node/pull/39242
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

34 files changed, 2715 insertions, 94 deletions

diff --git a/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/LICENSE b/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/LICENSE
index 4b1ad51b2f0..9e841e7a26e 100644..100755
--- a/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/LICENSE
+++ b/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/LICENSE
@@ -1,21 +1,21 @@
-    MIT License

-

-    Copyright (c) Microsoft Corporation. All rights reserved.

-

-    Permission is hereby granted, free of charge, to any person obtaining a copy

-    of this software and associated documentation files (the "Software"), to deal

-    in the Software without restriction, including without limitation the rights

-    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

-    copies of the Software, and to permit persons to whom the Software is

-    furnished to do so, subject to the following conditions:

-

-    The above copyright notice and this permission notice shall be included in all

-    copies or substantial portions of the Software.

-

-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

-    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

-    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

-    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

-    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

-    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

-    SOFTWARE

+    MIT License
+
+    Copyright (c) Microsoft Corporation.
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE
diff --git a/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/README.md b/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/README.md
index a15402a4524..78a310d17c9 100644..100755
--- a/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/README.md
+++ b/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/README.md
@@ -2,15 +2,117 @@
 > `npm install --save @types/unist`

 

 # Summary

-This package contains type definitions for non-npm package Unist ( https://github.com/syntax-tree/unist ).

+This package contains type definitions for Unist (https://github.com/syntax-tree/unist).

 

 # Details

-Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/unist

+Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/unist.

+## [index.d.ts](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/unist/index.d.ts)

+````ts

+// Type definitions for non-npm package Unist 2.0
+// Project: https://github.com/syntax-tree/unist
+// Definitions by: bizen241 <https://github.com/bizen241>
+//                 Jun Lu <https://github.com/lujun2>
+//                 Hernan Rajchert <https://github.com/hrajchert>
+//                 Titus Wormer <https://github.com/wooorm>
+//                 Junyoung Choi <https://github.com/rokt33r>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.0
+
+/**
+ * Syntactic units in unist syntax trees are called nodes.
+ */
+export interface Node {
+    /**
+     * The variant of a node.
+     */
+    type: string;
+
+    /**
+     * Information from the ecosystem.
+     */
+    data?: Data | undefined;
+
+    /**
+     * Location of a node in a source document.
+     * Must not be present if a node is generated.
+     */
+    position?: Position | undefined;
+
+    [key: string]: unknown;
+}
+
+/**
+ * Information associated by the ecosystem with the node.
+ * Space is guaranteed to never be specified by unist or specifications
+ * implementing unist.
+ */
+export interface Data {
+    [key: string]: unknown;
+}
+
+/**
+ * Location of a node in a source file.
+ */
+export interface Position {
+    /**
+     * Place of the first character of the parsed source region.
+     */
+    start: Point;
+
+    /**
+     * Place of the first character after the parsed source region.
+     */
+    end: Point;
+
+    /**
+     * Start column at each index (plus start line) in the source region,
+     * for elements that span multiple lines.
+     */
+    indent?: number[] | undefined;
+}
+
+/**
+ * One place in a source file.
+ */
+export interface Point {
+    /**
+     * Line in a source file (1-indexed integer).
+     */
+    line: number;
+
+    /**
+     * Column in a source file (1-indexed integer).
+     */
+    column: number;
+    /**
+     * Character in a source file (0-indexed integer).
+     */
+    offset?: number | undefined;
+}
+
+/**
+ * Nodes containing other nodes.
+ */
+export interface Parent extends Node {
+    /**
+     * List representing the children of a node.
+     */
+    children: Node[];
+}
+
+/**
+ * Nodes containing a value.
+ */
+export interface Literal extends Node {
+    value: unknown;
+}
 

-Additional Details

- * Last updated: Thu, 14 Feb 2019 18:10:46 GMT

+````

+

+### Additional Details

+ * Last updated: Fri, 02 Jul 2021 18:04:49 GMT

  * Dependencies: none

  * Global values: none

 

 # Credits

-These definitions were written by bizen241 <https://github.com/bizen241>, Jun Lu <https://github.com/lujun2>, Hernan Rajchert <https://github.com/hrajchert>, Titus Wormer <https://github.com/wooorm>, Junyoung Choi <https://github.com/rokt33r>.

+These definitions were written by [bizen241](https://github.com/bizen241), [Jun Lu](https://github.com/lujun2), [Hernan Rajchert](https://github.com/hrajchert), [Titus Wormer](https://github.com/wooorm), and [Junyoung Choi](https://github.com/rokt33r).

diff --git a/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/package.json b/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/package.json
index 78fa62811fa..d4d18b7cbe9 100644..100755
--- a/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/package.json
+++ b/tools/node_modules/eslint-plugin-markdown/node_modules/@types/unist/package.json
@@ -1,7 +1,8 @@
 {
     "name": "@types/unist",
-    "version": "2.0.3",
-    "description": "TypeScript definitions for non-npm package Unist",
+    "version": "2.0.4",
+    "description": "TypeScript definitions for Unist",
+    "homepage": "https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/unist",
     "license": "MIT",
     "contributors": [
         {
@@ -31,13 +32,14 @@
         }
     ],
     "main": "",
-    "types": "index",
+    "types": "index.d.ts",
     "repository": {
         "type": "git",
-        "url": "https://github.com/DefinitelyTyped/DefinitelyTyped.git"
+        "url": "https://github.com/DefinitelyTyped/DefinitelyTyped.git",
+        "directory": "types/unist"
     },
     "scripts": {},
     "dependencies": {},
-    "typesPublisherContentHash": "555fe20f164ccded02a3f69d8b45c8c9d2ec6fd53844a7c7858a3001c281bc9b",
-    "typeScriptVersion": "3.0"
+    "typesPublisherContentHash": "373f3a8c09fdf9fa50470b9d6b720dbe014e0fe93cb797a34481c4231e8fab59",
+    "typeScriptVersion": "3.6"
 }
\ No newline at end of file
diff --git a/tools/node_modules/eslint/README.md b/tools/node_modules/eslint/README.md
index 2202900d194..c87d07e0dcd 100644
--- a/tools/node_modules/eslint/README.md
+++ b/tools/node_modules/eslint/README.md
@@ -268,6 +268,11 @@ Anix
 <img src="https://github.com/yeonjuan.png?s=75" width="75" height="75"><br />
 YeonJuan
 </a>
+</td><td align="center" valign="top" width="11%">
+<a href="https://github.com/snitin315">
+<img src="https://github.com/snitin315.png?s=75" width="75" height="75"><br />
+Nitin Kumar
+</a>
 </td></tr></tbody></table>
 
 
diff --git a/tools/node_modules/eslint/lib/config/default-config.js b/tools/node_modules/eslint/lib/config/default-config.js
new file mode 100644
index 00000000000..cb6f403380d
--- /dev/null
+++ b/tools/node_modules/eslint/lib/config/default-config.js
@@ -0,0 +1,52 @@
+/**
+ * @fileoverview Default configuration
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Requirements
+//-----------------------------------------------------------------------------
+
+const Rules = require("../rules");
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+
+exports.defaultConfig = [
+    {
+        plugins: {
+            "@": {
+                parsers: {
+                    espree: require("espree")
+                },
+
+                /*
+                 * Because we try to delay loading rules until absolutely
+                 * necessary, a proxy  allows us to hook into the lazy-loading
+                 * aspect of the rules map while still keeping all of the
+                 * relevant configuration inside of the config array.
+                 */
+                rules: new Proxy({}, {
+                    get(target, property) {
+                        return Rules.get(property);
+                    },
+
+                    has(target, property) {
+                        return Rules.has(property);
+                    }
+                })
+            }
+        },
+        ignores: [
+            "**/node_modules/**",
+            ".git/**"
+        ],
+        languageOptions: {
+            parser: "@/espree"
+        }
+    }
+];
diff --git a/tools/node_modules/eslint/lib/config/flat-config-array.js b/tools/node_modules/eslint/lib/config/flat-config-array.js
new file mode 100644
index 00000000000..ecf396a3314
--- /dev/null
+++ b/tools/node_modules/eslint/lib/config/flat-config-array.js
@@ -0,0 +1,125 @@
+/**
+ * @fileoverview Flat Config Array
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Requirements
+//-----------------------------------------------------------------------------
+
+const { ConfigArray, ConfigArraySymbol } = require("@humanwhocodes/config-array");
+const { flatConfigSchema } = require("./flat-config-schema");
+const { RuleValidator } = require("./rule-validator");
+const { defaultConfig } = require("./default-config");
+const recommendedConfig = require("../../conf/eslint-recommended");
+const allConfig = require("../../conf/eslint-all");
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+const ruleValidator = new RuleValidator();
+
+/**
+ * Splits a plugin identifier in the form a/b/c into two parts: a/b and c.
+ * @param {string} identifier The identifier to parse.
+ * @returns {{objectName: string, pluginName: string}} The parts of the plugin
+ *      name.
+ */
+function splitPluginIdentifier(identifier) {
+    const parts = identifier.split("/");
+
+    return {
+        objectName: parts.pop(),
+        pluginName: parts.join("/")
+    };
+}
+
+//-----------------------------------------------------------------------------
+// Exports
+//-----------------------------------------------------------------------------
+
+/**
+ * Represents an array containing configuration information for ESLint.
+ */
+class FlatConfigArray extends ConfigArray {
+
+    /**
+     * Creates a new instance.
+     * @param {*[]} configs An array of configuration information.
+     * @param {{basePath: string, baseConfig: FlatConfig}} options The options
+     *      to use for the config array instance.
+     */
+    constructor(configs, { basePath, baseConfig = defaultConfig }) {
+        super(configs, {
+            basePath,
+            schema: flatConfigSchema
+        });
+
+        this.unshift(baseConfig);
+    }
+
+    /* eslint-disable class-methods-use-this */
+    /**
+     * Replaces a config with another config to allow us to put strings
+     * in the config array that will be replaced by objects before
+     * normalization.
+     * @param {Object} config The config to preprocess.
+     * @returns {Object} The preprocessed config.
+     */
+    [ConfigArraySymbol.preprocessConfig](config) {
+        if (config === "eslint:recommended") {
+            return recommendedConfig;
+        }
+
+        if (config === "eslint:all") {
+            return allConfig;
+        }
+
+        return config;
+    }
+
+    /**
+     * Finalizes the config by replacing plugin references with their objects
+     * and validating rule option schemas.
+     * @param {Object} config The config to finalize.
+     * @returns {Object} The finalized config.
+     * @throws {TypeError} If the config is invalid.
+     */
+    [ConfigArraySymbol.finalizeConfig](config) {
+
+        const { plugins, languageOptions, processor } = config;
+
+        // Check parser value
+        if (languageOptions && languageOptions.parser && typeof languageOptions.parser === "string") {
+            const { pluginName, objectName: parserName } = splitPluginIdentifier(languageOptions.parser);
+
+            if (!plugins || !plugins[pluginName] || !plugins[pluginName].parsers || !plugins[pluginName].parsers[parserName]) {
+                throw new TypeError(`Key "parser": Could not find "${parserName}" in plugin "${pluginName}".`);
+            }
+
+            languageOptions.parser = plugins[pluginName].parsers[parserName];
+        }
+
+        // Check processor value
+        if (processor && typeof processor === "string") {
+            const { pluginName, objectName: processorName } = splitPluginIdentifier(processor);
+
+            if (!plugins || !plugins[pluginName] || !plugins[pluginName].processors || !plugins[pluginName].processors[processorName]) {
+                throw new TypeError(`Key "processor": Could not find "${processorName}" in plugin "${pluginName}".`);
+            }
+
+            config.processor = plugins[pluginName].processors[processorName];
+        }
+
+        ruleValidator.validate(config);
+
+        return config;
+    }
+    /* eslint-enable class-methods-use-this */
+
+}
+
+exports.FlatConfigArray = FlatConfigArray;
diff --git a/tools/node_modules/eslint/lib/config/flat-config-schema.js b/tools/node_modules/eslint/lib/config/flat-config-schema.js
new file mode 100644
index 00000000000..80785476133
--- /dev/null
+++ b/tools/node_modules/eslint/lib/config/flat-config-schema.js
@@ -0,0 +1,452 @@
+/**
+ * @fileoverview Flat config schema
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Type Definitions
+//-----------------------------------------------------------------------------
+
+/**
+ * @typedef ObjectPropertySchema
+ * @property {Function|string} merge The function or name of the function to call
+ *      to merge multiple objects with this property.
+ * @property {Function|string} validate The function or name of the function to call
+ *      to validate the value of this property.
+ */
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+const ruleSeverities = new Map([
+    [0, 0], ["off", 0],
+    [1, 1], ["warn", 1],
+    [2, 2], ["error", 2]
+]);
+
+const globalVariablesValues = new Set([
+    true, "true", "writable", "writeable",
+    false, "false", "readonly", "readable", null,
+    "off"
+]);
+
+/**
+ * Check if a value is a non-null object.
+ * @param {any} value The value to check.
+ * @returns {boolean} `true` if the value is a non-null object.
+ */
+function isNonNullObject(value) {
+    return typeof value === "object" && value !== null;
+}
+
+/**
+ * Check if a value is undefined.
+ * @param {any} value The value to check.
+ * @returns {boolean} `true` if the value is undefined.
+ */
+function isUndefined(value) {
+    return typeof value === "undefined";
+}
+
+/**
+ * Deeply merges two objects.
+ * @param {Object} first The base object.
+ * @param {Object} second The overrides object.
+ * @returns {Object} An object with properties from both first and second.
+ */
+function deepMerge(first = {}, second = {}) {
+
+    /*
+     * If the second value is an array, just return it. We don't merge
+     * arrays because order matters and we can't know the correct order.
+     */
+    if (Array.isArray(second)) {
+        return second;
+    }
+
+    /*
+     * First create a result object where properties from the second object
+     * overwrite properties from the first. This sets up a baseline to use
+     * later rather than needing to inspect and change every property
+     * individually.
+     */
+    const result = {
+        ...first,
+        ...second
+    };
+
+    for (const key of Object.keys(second)) {
+
+        // avoid hairy edge case
+        if (key === "__proto__") {
+            continue;
+        }
+
+        const firstValue = first[key];
+        const secondValue = second[key];
+
+        if (isNonNullObject(firstValue)) {
+            result[key] = deepMerge(firstValue, secondValue);
+        } else if (isUndefined(firstValue)) {
+            if (isNonNullObject(secondValue)) {
+                result[key] = deepMerge(
+                    Array.isArray(secondValue) ? [] : {},
+                    secondValue
+                );
+            } else if (!isUndefined(secondValue)) {
+                result[key] = secondValue;
+            }
+        }
+    }
+
+    return result;
+
+}
+
+/**
+ * Normalizes the rule options config for a given rule by ensuring that
+ * it is an array and that the first item is 0, 1, or 2.
+ * @param {Array|string|number} ruleOptions The rule options config.
+ * @returns {Array} An array of rule options.
+ */
+function normalizeRuleOptions(ruleOptions) {
+
+    const finalOptions = Array.isArray(ruleOptions)
+        ? ruleOptions.slice(0)
+        : [ruleOptions];
+
+    finalOptions[0] = ruleSeverities.get(finalOptions[0]);
+    return finalOptions;
+}
+
+//-----------------------------------------------------------------------------
+// Assertions
+//-----------------------------------------------------------------------------
+
+/**
+ * Validates that a value is a valid rule options entry.
+ * @param {any} value The value to check.
+ * @returns {void}
+ * @throws {TypeError} If the value isn't a valid rule options.
+ */
+function assertIsRuleOptions(value) {
+
+    if (typeof value !== "string" && typeof value !== "number" && !Array.isArray(value)) {
+        throw new TypeError("Expected a string, number, or array.");
+    }
+}
+
+/**
+ * Validates that a value is valid rule severity.
+ * @param {any} value The value to check.
+ * @returns {void}
+ * @throws {TypeError} If the value isn't a valid rule severity.
+ */
+function assertIsRuleSeverity(value) {
+    const severity = typeof value === "string"
+        ? ruleSeverities.get(value.toLowerCase())
+        : ruleSeverities.get(value);
+
+    if (typeof severity === "undefined") {
+        throw new TypeError("Expected severity of \"off\", 0, \"warn\", 1, \"error\", or 2.");
+    }
+}
+
+/**
+ * Validates that a given string is the form pluginName/objectName.
+ * @param {string} value The string to check.
+ * @returns {void}
+ * @throws {TypeError} If the string isn't in the correct format.
+ */
+function assertIsPluginMemberName(value) {
+    if (!/[@a-z0-9-_$]+(?:\/(?:[a-z0-9-_$]+))+$/iu.test(value)) {
+        throw new TypeError(`Expected string in the form "pluginName/objectName" but found "${value}".`);
+    }
+}
+
+/**
+ * Validates that a value is an object.
+ * @param {any} value The value to check.
+ * @returns {void}
+ * @throws {TypeError} If the value isn't an object.
+ */
+function assertIsObject(value) {
+    if (!isNonNullObject(value)) {
+        throw new TypeError("Expected an object.");
+    }
+}
+
+/**
+ * Validates that a value is an object or a string.
+ * @param {any} value The value to check.
+ * @returns {void}
+ * @throws {TypeError} If the value isn't an object or a string.
+ */
+function assertIsObjectOrString(value) {
+    if ((!value || typeof value !== "object") && typeof value !== "string") {
+        throw new TypeError("Expected an object or string.");
+    }
+}
+
+//-----------------------------------------------------------------------------
+// Low-Level Schemas
+//-----------------------------------------------------------------------------
+
+
+/** @type {ObjectPropertySchema} */
+const numberSchema = {
+    merge: "replace",
+    validate: "number"
+};
+
+/** @type {ObjectPropertySchema} */
+const booleanSchema = {
+    merge: "replace",
+    validate: "boolean"
+};
+
+/** @type {ObjectPropertySchema} */
+const deepObjectAssignSchema = {
+    merge(first = {}, second = {}) {
+        return deepMerge(first, second);
+    },
+    validate: "object"
+};
+
+//-----------------------------------------------------------------------------
+// High-Level Schemas
+//-----------------------------------------------------------------------------
+
+/** @type {ObjectPropertySchema} */
+const globalsSchema = {
+    merge: "assign",
+    validate(value) {
+
+        assertIsObject(value);
+
+        for (const key of Object.keys(value)) {
+
+            // avoid hairy edge case
+            if (key === "__proto__") {
+                continue;
+            }
+
+            if (key !== key.trim()) {
+                throw new TypeError(`Global "${key}" has leading or trailing whitespace.`);
+            }
+
+            if (!globalVariablesValues.has(value[key])) {
+                throw new TypeError(`Key "${key}": Expected "readonly", "writable", or "off".`);
+            }
+        }
+    }
+};
+
+/** @type {ObjectPropertySchema} */
+const parserSchema = {
+    merge: "replace",
+    validate(value) {
+        assertIsObjectOrString(value);
+
+        if (typeof value === "object" && typeof value.parse !== "function" && typeof value.parseForESLint !== "function") {
+            throw new TypeError("Expected object to have a parse() or parseForESLint() method.");
+        }
+
+        if (typeof value === "string") {
+            assertIsPluginMemberName(value);
+        }
+    }
+};
+
+/** @type {ObjectPropertySchema} */
+const pluginsSchema = {
+    merge(first = {}, second = {}) {
+        const keys = new Set([...Object.keys(first), ...Object.keys(second)]);
+        const result = {};
+
+        // manually validate that plugins are not redefined
+        for (const key of keys) {
+
+            // avoid hairy edge case
+            if (key === "__proto__") {
+                continue;
+            }
+
+            if (key in first && key in second && first[key] !== second[key]) {
+                throw new TypeError(`Cannot redefine plugin "${key}".`);
+            }
+
+            result[key] = second[key] || first[key];
+        }
+
+        return result;
+    },
+    validate(value) {
+
+        // first check the value to be sure it's an object
+        if (value === null || typeof value !== "object") {
+            throw new TypeError("Expected an object.");
+        }
+
+        // second check the keys to make sure they are objects
+        for (const key of Object.keys(value)) {
+
+            // avoid hairy edge case
+            if (key === "__proto__") {
+                continue;
+            }
+
+            if (value[key] === null || typeof value[key] !== "object") {
+                throw new TypeError(`Key "${key}": Expected an object.`);
+            }
+        }
+    }
+};
+
+/** @type {ObjectPropertySchema} */
+const processorSchema = {
+    merge: "replace",
+    validate(value) {
+        if (typeof value === "string") {
+            assertIsPluginMemberName(value);
+        } else if (value && typeof value === "object") {
+            if (typeof value.preprocess !== "function" || typeof value.postprocess !== "function") {
+                throw new TypeError("Object must have a preprocess() and a postprocess() method.");
+            }
+        } else {
+            throw new TypeError("Expected an object or a string.");
+        }
+    }
+};
+
+/** @type {ObjectPropertySchema} */
+const rulesSchema = {
+    merge(first = {}, second = {}) {
+
+        const result = {
+            ...first,
+            ...second
+        };
+
+        for (const ruleId of Object.keys(result)) {
+
+            // avoid hairy edge case
+            if (ruleId === "__proto__") {
+
+                /* eslint-disable-next-line no-proto */
+                delete result.__proto__;
+                continue;
+            }
+
+            result[ruleId] = normalizeRuleOptions(result[ruleId]);
+
+            /*
+             * If either rule config is missing, then the correct
+             * config is already present and we just need to normalize
+             * the severity.
+             */
+            if (!(ruleId in first) || !(ruleId in second)) {
+                continue;
+            }
+
+            const firstRuleOptions = normalizeRuleOptions(first[ruleId]);
+            const secondRuleOptions = normalizeRuleOptions(second[ruleId]);
+
+            /*
+             * If the second rule config only has a severity (length of 1),
+             * then use that severity and keep the rest of the options from
+             * the first rule config.
+             */
+            if (secondRuleOptions.length === 1) {
+                result[ruleId] = [secondRuleOptions[0], ...firstRuleOptions.slice(1)];
+                continue;
+            }
+
+            /*
+             * In any other situation, then the second rule config takes
+             * precedence. That means the value at `result[ruleId]` is
+             * already correct and no further work is necessary.
+             */
+        }
+
+        return result;
+    },
+
+    validate(value) {
+        assertIsObject(value);
+
+        let lastRuleId;
+
+        // Performance: One try-catch has less overhead than one per loop iteration
+        try {
+
+            /*
+             * We are not checking the rule schema here because there is no
+             * guarantee that the rule definition is present at this point. Instead
+             * we wait and check the rule schema during the finalization step
+             * of calculating a config.
+             */
+            for (const ruleId of Object.keys(value)) {
+
+                // avoid hairy edge case
+                if (ruleId === "__proto__") {
+                    continue;
+                }
+
+                lastRuleId = ruleId;
+
+                const ruleOptions = value[ruleId];
+
+                assertIsRuleOptions(ruleOptions);
+
+                if (Array.isArray(ruleOptions)) {
+                    assertIsRuleSeverity(ruleOptions[0]);
+                } else {
+                    assertIsRuleSeverity(ruleOptions);
+                }
+            }
+        } catch (error) {
+            error.message = `Key "${lastRuleId}": ${error.message}`;
+            throw error;
+        }
+    }
+};
+
+/** @type {ObjectPropertySchema} */
+const sourceTypeSchema = {
+    merge: "replace",
+    validate(value) {
+        if (typeof value !== "string" || !/^(?:script|module|commonjs)$/u.test(value)) {
+            throw new TypeError("Expected \"script\", \"module\", or \"commonjs\".");
+        }
+    }
+};
+
+//-----------------------------------------------------------------------------
+// Full schema
+//-----------------------------------------------------------------------------
+
+exports.flatConfigSchema = {
+    settings: deepObjectAssignSchema,
+    linterOptions: {
+        schema: {
+            noInlineConfig: booleanSchema,
+            reportUnusedDisableDirectives: booleanSchema
+        }
+    },
+    languageOptions: {
+        schema: {
+            ecmaVersion: numberSchema,
+            sourceType: sourceTypeSchema,
+            globals: globalsSchema,
+            parser: parserSchema,
+            parserOptions: deepObjectAssignSchema
+        }
+    },
+    processor: processorSchema,
+    plugins: pluginsSchema,
+    rules: rulesSchema
+};
diff --git a/tools/node_modules/eslint/lib/config/rule-validator.js b/tools/node_modules/eslint/lib/config/rule-validator.js
new file mode 100644
index 00000000000..f162dd81a05
--- /dev/null
+++ b/tools/node_modules/eslint/lib/config/rule-validator.js
@@ -0,0 +1,169 @@
+/**
+ * @fileoverview Rule Validator
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Requirements
+//-----------------------------------------------------------------------------
+
+const ajv = require("../shared/ajv")();
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+/**
+ * Finds a rule with the given ID in the given config.
+ * @param {string} ruleId The ID of the rule to find.
+ * @param {Object} config The config to search in.
+ * @returns {{create: Function, schema: (Array|null)}} THe rule object.
+ */
+function findRuleDefinition(ruleId, config) {
+    const ruleIdParts = ruleId.split("/");
+    let pluginName, ruleName;
+
+    // built-in rule
+    if (ruleIdParts.length === 1) {
+        pluginName = "@";
+        ruleName = ruleIdParts[0];
+    } else {
+        ruleName = ruleIdParts.pop();
+        pluginName = ruleIdParts.join("/");
+    }
+
+    if (!config.plugins || !config.plugins[pluginName]) {
+        throw new TypeError(`Key "rules": Key "${ruleId}": Could not find plugin "${pluginName}".`);
+    }
+
+    if (!config.plugins[pluginName].rules || !config.plugins[pluginName].rules[ruleName]) {
+        throw new TypeError(`Key "rules": Key "${ruleId}": Could not find "${ruleName}" in plugin "${pluginName}".`);
+    }
+
+    return config.plugins[pluginName].rules[ruleName];
+
+}
+
+/**
+ * Gets a complete options schema for a rule.
+ * @param {{create: Function, schema: (Array|null)}} rule A new-style rule object
+ * @returns {Object} JSON Schema for the rule's options.
+ */
+function getRuleOptionsSchema(rule) {
+
+    if (!rule) {
+        return null;
+    }
+
+    const schema = rule.schema || rule.meta && rule.meta.schema;
+
+    if (Array.isArray(schema)) {
+        if (schema.length) {
+            return {
+                type: "array",
+                items: schema,
+                minItems: 0,
+                maxItems: schema.length
+            };
+        }
+        return {
+            type: "array",
+            minItems: 0,
+            maxItems: 0
+        };
+
+    }
+
+    // Given a full schema, leave it alone
+    return schema || null;
+}
+
+//-----------------------------------------------------------------------------
+// Exports
+//-----------------------------------------------------------------------------
+
+/**
+ * Implements validation functionality for the rules portion of a config.
+ */
+class RuleValidator {
+
+    /**
+     * Creates a new instance.
+     */
+    constructor() {
+
+        /**
+         * A collection of compiled validators for rules that have already
+         * been validated.
+         * @type {WeakMap}
+         * @property validators
+         */
+        this.validators = new WeakMap();
+    }
+
+    /**
+     * Validates all of the rule configurations in a config against each
+     * rule's schema.
+     * @param {Object} config The full config to validate. This object must
+     *      contain both the rules section and the plugins section.
+     * @returns {void}
+     * @throws {Error} If a rule's configuration does not match its schema.
+     */
+    validate(config) {
+
+        if (!config.rules) {
+            return;
+        }
+
+        for (const [ruleId, ruleOptions] of Object.entries(config.rules)) {
+
+            // check for edge case
+            if (ruleId === "__proto__") {
+                continue;
+            }
+
+            /*
+             * If a rule is disabled, we don't do any validation. This allows
+             * users to safely set any value to 0 or "off" without worrying
+             * that it will cause a validation error.
+             *
+             * Note: ruleOptions is always an array at this point because
+             * this validation occurs after FlatConfigArray has merged and
+             * normalized values.
+             */
+            if (ruleOptions[0] === 0) {
+                continue;
+            }
+
+            const rule = findRuleDefinition(ruleId, config);
+
+            // Precompile and cache validator the first time
+            if (!this.validators.has(rule)) {
+                const schema = getRuleOptionsSchema(rule);
+
+                if (schema) {
+                    this.validators.set(rule, ajv.compile(schema));
+                }
+            }
+
+            const validateRule = this.validators.get(rule);
+
+            if (validateRule) {
+
+                validateRule(ruleOptions.slice(1));
+
+                if (validateRule.errors) {
+                    throw new Error(`Key "rules": Key "${ruleId}": ${
+                        validateRule.errors.map(
+                            error => `\tValue ${JSON.stringify(error.data)} ${error.message}.\n`
+                        ).join("")
+                    }`);
+                }
+            }
+        }
+    }
+}
+
+exports.RuleValidator = RuleValidator;
diff --git a/tools/node_modules/eslint/lib/linter/linter.js b/tools/node_modules/eslint/lib/linter/linter.js
index e94b507b5dd..4e80926a895 100644
--- a/tools/node_modules/eslint/lib/linter/linter.js
+++ b/tools/node_modules/eslint/lib/linter/linter.js
@@ -37,8 +37,10 @@ const
 const debug = require("debug")("eslint:linter");
 const MAX_AUTOFIX_PASSES = 10;
 const DEFAULT_PARSER_NAME = "espree";
+const DEFAULT_ECMA_VERSION = 5;
 const commentParser = new ConfigCommentParser();
 const DEFAULT_ERROR_LOC = { start: { line: 1, column: 0 }, end: { line: 1, column: 1 } };
+const parserSymbol = Symbol.for("eslint.RuleTester.parser");
 
 //------------------------------------------------------------------------------
 // Typedefs
@@ -432,10 +434,16 @@ function getDirectiveComments(filename, ast, ruleMapper, warnInlineConfig) {
 
 /**
  * Normalize ECMAScript version from the initial config
- * @param  {number} ecmaVersion ECMAScript version from the initial config
+ * @param {Parser} parser The parser which uses this options.
+ * @param {number} ecmaVersion ECMAScript version from the initial config
  * @returns {number} normalized ECMAScript version
  */
-function normalizeEcmaVersion(ecmaVersion) {
+function normalizeEcmaVersion(parser, ecmaVersion) {
+    if ((parser[parserSymbol] || parser) === espree) {
+        if (ecmaVersion === "latest") {
+            return espree.latestEcmaVersion;
+        }
+    }
 
     /*
      * Calculate ECMAScript edition number from official year version starting with
@@ -521,12 +529,13 @@ function normalizeVerifyOptions(providedOptions, config) {
 
 /**
  * Combines the provided parserOptions with the options from environments
- * @param {string} parserName The parser name which uses this options.
+ * @param {Parser} parser The parser which uses this options.
  * @param {ParserOptions} providedOptions The provided 'parserOptions' key in a config
  * @param {Environment[]} enabledEnvironments The environments enabled in configuration and with inline comments
  * @returns {ParserOptions} Resulting parser options after merge
  */
-function resolveParserOptions(parserName, providedOptions, enabledEnvironments) {
+function resolveParserOptions(parser, providedOptions, enabledEnvironments) {
+
     const parserOptionsFromEnv = enabledEnvironments
         .filter(env => env.parserOptions)
         .reduce((parserOptions, env) => merge(parserOptions, env.parserOptions), {});
@@ -542,12 +551,7 @@ function resolveParserOptions(parserName, providedOptions, enabledEnvironments)
         mergedParserOptions.ecmaFeatures = Object.assign({}, mergedParserOptions.ecmaFeatures, { globalReturn: false });
     }
 
-    /*
-     * TODO: @aladdin-add
-     * 1. for a 3rd-party parser, do not normalize parserOptions
-     * 2. for espree, no need to do this (espree will do it)
-     */
-    mergedParserOptions.ecmaVersion = normalizeEcmaVersion(mergedParserOptions.ecmaVersion);
+    mergedParserOptions.ecmaVersion = normalizeEcmaVersion(parser, mergedParserOptions.ecmaVersion);
 
     return mergedParserOptions;
 }
@@ -606,7 +610,7 @@ function getRuleOptions(ruleConfig) {
  */
 function analyzeScope(ast, parserOptions, visitorKeys) {
     const ecmaFeatures = parserOptions.ecmaFeatures || {};
-    const ecmaVersion = parserOptions.ecmaVersion || 5;
+    const ecmaVersion = parserOptions.ecmaVersion || DEFAULT_ECMA_VERSION;
 
     return eslintScope.analyze(ast, {
         ignoreEval: true,
@@ -1123,7 +1127,7 @@ class Linter {
             .map(envName => getEnv(slots, envName))
             .filter(env => env);
 
-        const parserOptions = resolveParserOptions(parserName, config.parserOptions || {}, enabledEnvs);
+        const parserOptions = resolveParserOptions(parser, config.parserOptions || {}, enabledEnvs);
         const configuredGlobals = resolveGlobals(config.globals || {}, enabledEnvs);
         const settings = config.settings || {};
 
diff --git a/tools/node_modules/eslint/lib/rule-tester/rule-tester.js b/tools/node_modules/eslint/lib/rule-tester/rule-tester.js
index cac81bc71d1..2b5524923be 100644
--- a/tools/node_modules/eslint/lib/rule-tester/rule-tester.js
+++ b/tools/node_modules/eslint/lib/rule-tester/rule-tester.js
@@ -53,6 +53,7 @@ const
 const ajv = require("../shared/ajv")({ strictDefaults: true });
 
 const espreePath = require.resolve("espree");
+const parserSymbol = Symbol.for("eslint.RuleTester.parser");
 
 //------------------------------------------------------------------------------
 // Typedefs
@@ -239,6 +240,7 @@ function defineStartEndAsError(objName, node) {
     });
 }
 
+
 /**
  * Define `start`/`end` properties of all nodes of the given AST as throwing error.
  * @param {ASTNode} ast The root node to errorize `start`/`end` properties.
@@ -258,8 +260,10 @@ function defineStartEndAsErrorInTree(ast, visitorKeys) {
  * @returns {Parser} Wrapped parser object.
  */
 function wrapParser(parser) {
+
     if (typeof parser.parseForESLint === "function") {
         return {
+            [parserSymbol]: parser,
             parseForESLint(...args) {
                 const ret = parser.parseForESLint(...args);
 
@@ -268,7 +272,9 @@ function wrapParser(parser) {
             }
         };
     }
+
     return {
+        [parserSymbol]: parser,
         parse(...args) {
             const ast = parser.parse(...args);
 
diff --git a/tools/node_modules/eslint/lib/rules/dot-notation.js b/tools/node_modules/eslint/lib/rules/dot-notation.js
index 751b4628edc..3aa9f3110f5 100644
--- a/tools/node_modules/eslint/lib/rules/dot-notation.js
+++ b/tools/node_modules/eslint/lib/rules/dot-notation.js
@@ -94,7 +94,7 @@ module.exports = {
 
                         // Don't perform any fixes if there are comments inside the brackets.
                         if (sourceCode.commentsExistBetween(leftBracket, rightBracket)) {
-                            return; // eslint-disable-line eslint-plugin/fixer-return -- false positive
+                            return;
                         }
 
                         // Replace the brackets by an identifier.
@@ -154,12 +154,12 @@ module.exports = {
 
                             // A statement that starts with `let[` is parsed as a destructuring variable declaration, not a MemberExpression.
                             if (node.object.type === "Identifier" && node.object.name === "let" && !node.optional) {
-                                return; // eslint-disable-line eslint-plugin/fixer-return -- false positive
+                                return;
                             }
 
                             // Don't perform any fixes if there are comments between the dot and the property name.
                             if (sourceCode.commentsExistBetween(dotToken, node.property)) {
-                                return; // eslint-disable-line eslint-plugin/fixer-return -- false positive
+                                return;
                             }
 
                             // Replace the identifier to brackets.
diff --git a/tools/node_modules/eslint/lib/rules/prefer-arrow-callback.js b/tools/node_modules/eslint/lib/rules/prefer-arrow-callback.js
index ee5cfe3c8c7..a01c0340821 100644
--- a/tools/node_modules/eslint/lib/rules/prefer-arrow-callback.js
+++ b/tools/node_modules/eslint/lib/rules/prefer-arrow-callback.js
@@ -295,7 +295,7 @@ module.exports = {
                                  * If the callback function has duplicates in its list of parameters (possible in sloppy mode),
                                  * don't replace it with an arrow function, because this is a SyntaxError with arrow functions.
                                  */
-                                return; // eslint-disable-line eslint-plugin/fixer-return -- false positive
+                                return;
                             }
 
                             // Remove `.bind(this)` if exists.
@@ -307,7 +307,7 @@ module.exports = {
                                  * E.g. `(foo || function(){}).bind(this)`
                                  */
                                 if (memberNode.type !== "MemberExpression") {
-                                    return; // eslint-disable-line eslint-plugin/fixer-return -- false positive
+                                    return;
                                 }
 
                                 const callNode = memberNode.parent;
@@ -320,12 +320,12 @@ module.exports = {
                                  *                    ^^^^^^^^^^^^
                                  */
                                 if (astUtils.isParenthesised(sourceCode, memberNode)) {
-                                    return; // eslint-disable-line eslint-plugin/fixer-return -- false positive
+                                    return;
                                 }
 
                                 // If comments exist in the `.bind(this)`, don't remove those.
                                 if (sourceCode.commentsExistBetween(firstTokenToRemove, lastTokenToRemove)) {
-                                    return; // eslint-disable-line eslint-plugin/fixer-return -- false positive
+                                    return;
                                 }
 
                                 yield fixer.removeRange([firstTokenToRemove.range[0], lastTokenToRemove.range[1]]);
diff --git a/tools/node_modules/eslint/lib/rules/use-isnan.js b/tools/node_modules/eslint/lib/rules/use-isnan.js
index 0c7e888c976..ef95b21314a 100644
--- a/tools/node_modules/eslint/lib/rules/use-isnan.js
+++ b/tools/node_modules/eslint/lib/rules/use-isnan.js
@@ -21,7 +21,10 @@ const astUtils = require("./utils/ast-utils");
  * @returns {boolean} `true` if the node is 'NaN' identifier.
  */
 function isNaNIdentifier(node) {
-    return Boolean(node) && node.type === "Identifier" && node.name === "NaN";
+    return Boolean(node) && (
+        astUtils.isSpecificId(node, "NaN") ||
+        astUtils.isSpecificMemberAccess(node, "Number", "NaN")
+    );
 }
 
 //------------------------------------------------------------------------------
diff --git a/tools/node_modules/eslint/lib/source-code/source-code.js b/tools/node_modules/eslint/lib/source-code/source-code.js
index c13ce29b877..cc4524fa74c 100644
--- a/tools/node_modules/eslint/lib/source-code/source-code.js
+++ b/tools/node_modules/eslint/lib/source-code/source-code.js
@@ -349,7 +349,7 @@ class SourceCode extends TokenStore {
             let currentToken = this.getTokenBefore(node, { includeComments: true });
 
             while (currentToken && isCommentToken(currentToken)) {
-                if (node.parent && (currentToken.start < node.parent.start)) {
+                if (node.parent && node.parent.type !== "Program" && (currentToken.start < node.parent.start)) {
                     break;
                 }
                 comments.leading.push(currentToken);
@@ -361,7 +361,7 @@ class SourceCode extends TokenStore {
             currentToken = this.getTokenAfter(node, { includeComments: true });
 
             while (currentToken && isCommentToken(currentToken)) {
-                if (node.parent && (currentToken.end > node.parent.end)) {
+                if (node.parent && node.parent.type !== "Program" && (currentToken.end > node.parent.end)) {
                     break;
                 }
                 comments.trailing.push(currentToken);
diff --git a/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/LICENSE b/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/LICENSE
new file mode 100644
index 00000000000..261eeb9e9f8
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
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+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
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+      on behalf of whom a Contribution has been received by Licensor and
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+   4. Redistribution. You may reproduce and distribute copies of the
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diff --git a/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/README.md b/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/README.md
new file mode 100644
index 00000000000..9cfe637bb3d
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/README.md
@@ -0,0 +1,258 @@
+# Config Array
+
+by [Nicholas C. Zakas](https://humanwhocodes.com)
+
+If you find this useful, please consider supporting my work with a [donation](https://humanwhocodes.com/donate).
+
+## Description
+
+A config array is a way of managing configurations that are based on glob pattern matching of filenames. Each config array contains the information needed to determine the correct configuration for any file based on the filename. 
+
+## Background
+
+In 2019, I submitted an [ESLint RFC](https://github.com/eslint/rfcs/pull/9) proposing a new way of configuring ESLint. The goal was to streamline what had become an increasingly complicated configuration process. Over several iterations, this proposal was eventually born.
+
+The basic idea is that all configuration, including overrides, can be represented by a single array where each item in the array is a config object. Config objects appearing later in the array override config objects appearing earlier in the array. You can calculate a config for a given file by traversing all config objects in the array to find the ones that match the filename. Matching is done by specifying glob patterns in `files` and `ignores` properties on each config object. Here's an example:
+
+```js
+export default [
+
+    // match all JSON files
+    {
+        name: "JSON Handler",
+        files: ["**/*.json"],
+        handler: jsonHandler
+    },
+
+    // match only package.json
+    {
+        name: "package.json Handler",
+        files: ["package.json"],
+        handler: packageJsonHandler
+    }
+];
+```
+
+In this example, there are two config objects: the first matches all JSON files in all directories and the second matches just `package.json` in the base path directory (all the globs are evaluated as relative to a base path that can be specified). When you retrieve a configuration for `foo.json`, only the first config object matches so `handler` is equal to `jsonHandler`; when you retrieve a configuration for `package.json`, `handler` is equal to `packageJsonHandler` (because both config objects match, the second one wins).
+
+## Installation
+
+You can install the package using npm or Yarn:
+
+```bash
+npm install @humanwhocodes/config-array --save
+
+# or
+
+yarn add @humanwhocodes/config-array
+```
+
+## Usage
+
+First, import the `ConfigArray` constructor:
+
+```js
+import { ConfigArray } from "@humanwhocodes/config-array";
+
+// or using CommonJS
+
+const { ConfigArray } = require("@humanwhocodes/config-array");
+```
+
+When you create a new instance of `ConfigArray`, you must pass in two arguments: an array of configs and an options object. The array of configs is most likely read in from a configuration file, so here's a typical example:
+
+```js
+const configFilename = path.resolve(process.cwd(), "my.config.js");
+const { default: rawConfigs } = await import(configFilename);
+const configs = new ConfigArray(rawConfigs, {
+    
+    // the path to match filenames from
+    basePath: process.cwd(),
+
+    // additional items in each config
+    schema: mySchema
+});
+```
+
+This example reads in an object or array from `my.config.js` and passes it into the `ConfigArray` constructor as the first argument. The second argument is an object specifying the `basePath` (the directoy in which `my.config.js` is found) and a `schema` to define the additional properties of a config object beyond `files`, `ignores`, and `name`.
+
+### Specifying a Schema
+
+The `schema` option is required for you to use additional properties in config objects. The schema is object that follows the format of an [`ObjectSchema`](https://npmjs.com/package/@humanwhocodes/object-schema). The schema specifies both validation and merge rules that the `ConfigArray` instance needs to combine configs when there are multiple matches. Here's an example:
+
+```js
+const configFilename = path.resolve(process.cwd(), "my.config.js");
+const { default: rawConfigs } = await import(configFilename);
+
+const mySchema = {
+
+    // define the handler key in configs
+    handler: {
+        required: true,
+        merge(a, b) {
+            if (!b) return a;
+            if (!a) return b;
+        },
+        validate(value) {
+            if (typeof value !== "function") {
+                throw new TypeError("Function expected.");
+            }
+        }
+    }
+};
+
+const configs = new ConfigArray(rawConfigs, {
+    
+    // the path to match filenames from
+    basePath: process.cwd(),
+
+    // additional items in each config
+    schema: mySchema
+});
+```
+
+### Config Arrays
+
+Config arrays can be multidimensional, so it's possible for a config array to contain another config array, such as:
+
+```js
+export default [
+    
+    // JS config
+    {
+        files: ["**/*.js"],
+        handler: jsHandler
+    },
+
+    // JSON configs
+    [
+
+        // match all JSON files
+        {
+            name: "JSON Handler",
+            files: ["**/*.json"],
+            handler: jsonHandler
+        },
+
+        // match only package.json
+        {
+            name: "package.json Handler",
+            files: ["package.json"],
+            handler: packageJsonHandler
+        }
+    ],
+
+    // filename must match function
+    {
+        files: [ filePath => filePath.endsWith(".md") ],
+        handler: markdownHandler
+    },
+
+    // filename must match all patterns in subarray
+    {
+        files: [ ["*.test.*", "*.js"] ],
+        handler: jsTestHandler
+    },
+
+    // filename must not match patterns beginning with !
+    {
+        name: "Non-JS files",
+        files: ["!*.js"],
+        settings: {
+            js: false
+        }
+    }
+];
+```
+
+In this example, the array contains both config objects and a config array. When a config array is normalized (see details below), it is flattened so only config objects remain. However, the order of evaluation remains the same.
+
+If the `files` array contains a function, then that function is called with the absolute path of the file and is expected to return `true` if there is a match and `false` if not. (The `ignores` array can also contain functions.)
+
+If the `files` array contains an item that is an array of strings and functions, then all patterns must match in order for the config to match. In the preceding examples, both `*.test.*` and `*.js` must match in order for the config object to be used.
+
+If a pattern in the files array begins with `!` then it excludes that pattern. In the preceding example, any filename that doesn't end with `.js` will automatically getting a `settings.js` property set to `false`.
+
+### Config Functions
+
+Config arrays can also include config functions. A config function accepts a single parameter, `context` (defined by you), and must return either a config object or a config array (it cannot return another function). Config functions allow end users to execute code in the creation of appropriate config objects. Here's an example:
+
+```js
+export default [
+    
+    // JS config
+    {
+        files: ["**/*.js"],
+        handler: jsHandler
+    },
+
+    // JSON configs
+    function (context) {
+        return [
+
+            // match all JSON files
+            {
+                name: context.name + " JSON Handler",
+                files: ["**/*.json"],
+                handler: jsonHandler
+            },
+
+            // match only package.json
+            {
+                name: context.name + " package.json Handler",
+                files: ["package.json"],
+                handler: packageJsonHandler
+            }
+        ];
+    }
+];
+```
+
+When a config array is normalized, each function is executed and replaced in the config array with the return value.
+
+**Note:** Config functions cannot be async. This will be added in a future version.
+
+### Normalizing Config Arrays
+
+Once a config array has been created and loaded with all of the raw config data, it must be normalized before it can be used. The normalization process goes through and flattens the config array as well as executing all config functions to get their final values.
+
+To normalize a config array, call the `normalize()` method and pass in a context object:
+
+```js
+await configs.normalize({
+    name: "MyApp"
+});
+```
+
+The `normalize()` method returns a promise, so be sure to use the `await` operator. The config array instance is normalized in-place, so you don't need to create a new variable.
+
+**Important:** Once a `ConfigArray` is normalized, it cannot be changed further. You can, however, create a new `ConfigArray` and pass in the normalized instance to create an unnormalized copy.
+
+### Getting Config for a File
+
+To get the config for a file, use the `getConfig()` method on a normalized config array and pass in the filename to get a config for:
+
+```js
+// pass in absolute filename
+const fileConfig = configs.getConfig(path.resolve(process.cwd(), "package.json"));
+```
+
+The config array always returns an object, even if there are no configs matching the given filename. You can then inspect the returned config object to determine how to proceed.
+
+A few things to keep in mind:
+
+* You must pass in the absolute filename to get a config for.
+* The returned config object never has `files`, `ignores`, or `name` properties; the only properties on the object will be the other configuration options specified.
+* The config array caches configs, so subsequent calls to `getConfig()` with the same filename will return in a fast lookup rather than another calculation.
+
+## Acknowledgements
+
+The design of this project was influenced by feedback on the ESLint RFC, and incorporates ideas from:
+
+* Teddy Katz (@not-an-aardvark)
+* Toru Nagashima (@mysticatea)
+* Kai Cataldo (@kaicataldo)
+
+## License
+
+Apache 2.0
diff --git a/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/api.js b/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/api.js
new file mode 100644
index 00000000000..a9aacf46b5c
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/api.js
@@ -0,0 +1,457 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }
+
+var path = _interopDefault(require('path'));
+var minimatch = _interopDefault(require('minimatch'));
+var createDebug = _interopDefault(require('debug'));
+var objectSchema = require('@humanwhocodes/object-schema');
+
+/**
+ * @fileoverview ConfigSchema
+ * @author Nicholas C. Zakas
+ */
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Assets that a given value is an array.
+ * @param {*} value The value to check.
+ * @returns {void}
+ * @throws {TypeError} When the value is not an array. 
+ */
+function assertIsArray(value) {
+	if (!Array.isArray(value)) {
+		throw new TypeError('Expected value to be an array.');
+	}
+}
+
+/**
+ * Assets that a given value is an array containing only strings and functions.
+ * @param {*} value The value to check.
+ * @returns {void}
+ * @throws {TypeError} When the value is not an array of strings and functions.
+ */
+function assertIsArrayOfStringsAndFunctions(value, name) {
+	assertIsArray(value);
+
+	if (value.some(item => typeof item !== 'string' && typeof item !== 'function')) {
+		throw new TypeError('Expected array to only contain strings.');
+	}
+}
+
+//------------------------------------------------------------------------------
+// Exports
+//------------------------------------------------------------------------------
+
+/**
+ * The base schema that every ConfigArray uses.
+ * @type Object
+ */
+const baseSchema = Object.freeze({
+	name: {
+		required: false,
+		merge() {
+			return undefined;
+		},
+		validate(value) {
+			if (typeof value !== 'string') {
+				throw new TypeError('Property must be a string.');
+			}
+		}
+	},
+	files: {
+		required: false,
+		merge() {
+			return undefined;
+		},
+		validate(value) {
+
+			// first check if it's an array
+			assertIsArray(value);
+
+			// then check each member
+			value.forEach(item => {
+				if (Array.isArray(item)) {
+					assertIsArrayOfStringsAndFunctions(item);
+				} else if (typeof item !== 'string' && typeof item !== 'function') {
+					throw new TypeError('Items must be a string, a function, or an array of strings and functions.');
+				}
+			});
+
+		}
+	},
+	ignores: {
+		required: false,
+		merge() {
+			return undefined;
+		},
+		validate: assertIsArrayOfStringsAndFunctions
+	}
+});
+
+/**
+ * @fileoverview ConfigArray
+ * @author Nicholas C. Zakas
+ */
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const debug = createDebug('@hwc/config-array');
+
+const MINIMATCH_OPTIONS = {
+	matchBase: true
+};
+
+/**
+ * Shorthand for checking if a value is a string.
+ * @param {any} value The value to check.
+ * @returns {boolean} True if a string, false if not. 
+ */
+function isString(value) {
+	return typeof value === 'string';
+}
+
+/**
+ * Normalizes a `ConfigArray` by flattening it and executing any functions
+ * that are found inside.
+ * @param {Array} items The items in a `ConfigArray`.
+ * @param {Object} context The context object to pass into any function
+ *      found.
+ * @returns {Array} A flattened array containing only config objects.
+ * @throws {TypeError} When a config function returns a function.
+ */
+async function normalize(items, context) {
+
+	// TODO: Allow async config functions
+
+	function *flatTraverse(array) {
+		for (let item of array) {
+			if (typeof item === 'function') {
+				item = item(context);
+			}
+
+			if (Array.isArray(item)) {
+				yield * flatTraverse(item);
+			} else if (typeof item === 'function') {
+				throw new TypeError('A config function can only return an object or array.');
+			} else {
+				yield item;
+			}
+		}
+	}
+
+	return [...flatTraverse(items)];
+}
+
+/**
+ * Determines if a given file path is matched by a config. If the config
+ * has no `files` field, then it matches; otherwise, if a `files` field
+ * is present then we match the globs in `files` and exclude any globs in
+ * `ignores`.
+ * @param {string} filePath The absolute file path to check.
+ * @param {Object} config The config object to check.
+ * @returns {boolean} True if the file path is matched by the config,
+ *      false if not.
+ */
+function pathMatches(filePath, basePath, config) {
+
+	// a config without a `files` field always matches
+	if (!config.files) {
+		return true;
+	}
+
+	// if files isn't an array, throw an error
+	if (!Array.isArray(config.files) || config.files.length === 0) {
+		throw new TypeError('The files key must be a non-empty array.');
+	}
+
+	const relativeFilePath = path.relative(basePath, filePath);
+
+	// match both strings and functions
+	const match = pattern => {
+		if (isString(pattern)) {
+			return minimatch(relativeFilePath, pattern, MINIMATCH_OPTIONS);
+		}
+
+		if (typeof pattern === 'function') {
+			return pattern(filePath);
+		}
+	};
+
+	// check for all matches to config.files
+	let matches = config.files.some(pattern => {
+		if (Array.isArray(pattern)) {
+			return pattern.every(match);
+		}
+
+		return match(pattern);
+	});
+
+	/*
+	 * If the file path matches the config.files patterns, then check to see
+	 * if there are any files to ignore.
+	 */
+	if (matches && config.ignores) {
+		matches = !config.ignores.some(pattern => {
+			return minimatch(filePath, pattern, MINIMATCH_OPTIONS);
+		});
+	}
+
+	return matches;
+}
+
+/**
+ * Ensures that a ConfigArray has been normalized.
+ * @param {ConfigArray} configArray The ConfigArray to check. 
+ * @returns {void}
+ * @throws {Error} When the `ConfigArray` is not normalized.
+ */
+function assertNormalized(configArray) {
+	// TODO: Throw more verbose error
+	if (!configArray.isNormalized()) {
+		throw new Error('ConfigArray must be normalized to perform this operation.');
+	}
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+const ConfigArraySymbol = {
+	isNormalized: Symbol('isNormalized'),
+	configCache: Symbol('configCache'),
+	schema: Symbol('schema'),
+	finalizeConfig: Symbol('finalizeConfig'),
+	preprocessConfig: Symbol('preprocessConfig')
+};
+
+/**
+ * Represents an array of config objects and provides method for working with
+ * those config objects.
+ */
+class ConfigArray extends Array {
+
+	/**
+	 * Creates a new instance of ConfigArray.
+	 * @param {Iterable|Function|Object} configs An iterable yielding config
+	 *      objects, or a config function, or a config object.
+	 * @param {string} [options.basePath=""] The path of the config file
+	 * @param {boolean} [options.normalized=false] Flag indicating if the
+	 *      configs have already been normalized.
+	 * @param {Object} [options.schema] The additional schema 
+	 *      definitions to use for the ConfigArray schema.
+	 */
+	constructor(configs, { basePath = '', normalized = false, schema: customSchema } = {}) {
+		super();
+
+		/**
+		 * Tracks if the array has been normalized.
+		 * @property isNormalized
+		 * @type boolean
+		 * @private
+		 */
+		this[ConfigArraySymbol.isNormalized] = normalized;
+
+		/**
+		 * The schema used for validating and merging configs.
+		 * @property schema
+		 * @type ObjectSchema
+		 * @private
+		 */
+		this[ConfigArraySymbol.schema] = new objectSchema.ObjectSchema({
+			...customSchema,
+			...baseSchema
+		});
+
+		/**
+		 * The path of the config file that this array was loaded from.
+		 * This is used to calculate filename matches.
+		 * @property basePath
+		 * @type string
+		 */
+		this.basePath = basePath;
+
+		/**
+		 * A cache to store calculated configs for faster repeat lookup.
+		 * @property configCache
+		 * @type Map
+		 * @private
+		 */
+		this[ConfigArraySymbol.configCache] = new Map();
+
+		// load the configs into this array
+		if (Array.isArray(configs)) {
+			this.push(...configs);
+		} else {
+			this.push(configs);
+		}
+
+	}
+
+	/**
+	 * Prevent normal array methods from creating a new `ConfigArray` instance.
+	 * This is to ensure that methods such as `slice()` won't try to create a 
+	 * new instance of `ConfigArray` behind the scenes as doing so may throw
+	 * an error due to the different constructor signature.
+	 * @returns {Function} The `Array` constructor.
+	 */
+	static get [Symbol.species]() {
+		return Array;
+	}
+
+	/**
+	 * Returns the `files` globs from every config object in the array.
+	 * Negated patterns (those beginning with `!`) are not returned.
+	 * This can be used to determine which files will be matched by a
+	 * config array or to use as a glob pattern when no patterns are provided
+	 * for a command line interface.
+	 * @returns {string[]} An array of string patterns.
+	 */
+	get files() {
+
+		assertNormalized(this);
+
+		const result = [];
+
+		for (const config of this) {
+			if (config.files) {
+				config.files.forEach(filePattern => {
+					if (Array.isArray(filePattern)) {
+						result.push(...filePattern.filter(pattern => {
+							return isString(pattern) && !pattern.startsWith('!');
+						}));
+					} else if (isString(filePattern) && !filePattern.startsWith('!')) {
+						result.push(filePattern);
+					}
+				});
+			}
+		}
+
+		return result;
+	}
+
+	/**
+	 * Returns the file globs that should always be ignored regardless of
+	 * the matching `files` fields in any configs. This is necessary to mimic
+	 * the behavior of things like .gitignore and .eslintignore, allowing a
+	 * globbing operation to be faster.
+	 * @returns {string[]} An array of string patterns to be ignored.
+	 */
+	get ignores() {
+
+		assertNormalized(this);
+
+		const result = [];
+
+		for (const config of this) {
+			if (config.ignores && !config.files) {
+				result.push(...config.ignores.filter(isString));
+			}
+		}
+
+		return result;
+	}
+
+	/**
+	 * Indicates if the config array has been normalized.
+	 * @returns {boolean} True if the config array is normalized, false if not.
+	 */
+	isNormalized() {
+		return this[ConfigArraySymbol.isNormalized];
+	}
+
+	/**
+	 * Normalizes a config array by flattening embedded arrays and executing
+	 * config functions.
+	 * @param {ConfigContext} context The context object for config functions.
+	 * @returns {ConfigArray} A new ConfigArray instance that is normalized.
+	 */
+	async normalize(context = {}) {
+
+		if (!this.isNormalized()) {
+			const normalizedConfigs = await normalize(this, context);
+			this.length = 0;
+			this.push(...normalizedConfigs.map(this[ConfigArraySymbol.preprocessConfig]));
+			this[ConfigArraySymbol.isNormalized] = true;
+
+			// prevent further changes
+			Object.freeze(this);
+		}
+
+		return this;
+	}
+
+	/**
+	 * Finalizes the state of a config before being cached and returned by
+	 * `getConfig()`. Does nothing by default but is provided to be
+	 * overridden by subclasses as necessary.
+	 * @param {Object} config The config to finalize.
+	 * @returns {Object} The finalized config.
+	 */
+	[ConfigArraySymbol.finalizeConfig](config) {
+		return config;
+	}
+
+	/**
+	 * Preprocesses a config during the normalization process. This is the
+	 * method to override if you want to convert an array item before it is
+	 * validated for the first time. For example, if you want to replace a
+	 * string with an object, this is the method to override.
+	 * @param {Object} config The config to preprocess.
+	 * @returns {Object} The config to use in place of the argument.
+	 */
+	[ConfigArraySymbol.preprocessConfig](config) {
+		return config;
+	}
+
+	/**
+	 * Returns the config object for a given file path.
+	 * @param {string} filePath The complete path of a file to get a config for.
+	 * @returns {Object} The config object for this file.
+	 */
+	getConfig(filePath) {
+
+		assertNormalized(this);
+
+		// first check the cache to avoid duplicate work
+		let finalConfig = this[ConfigArraySymbol.configCache].get(filePath);
+
+		if (finalConfig) {
+			return finalConfig;
+		}
+
+		// No config found in cache, so calculate a new one
+
+		const matchingConfigs = [];
+
+		for (const config of this) {
+			if (pathMatches(filePath, this.basePath, config)) {
+				debug(`Matching config found for ${filePath}`);
+				matchingConfigs.push(config);
+			} else {
+				debug(`No matching config found for ${filePath}`);
+			}
+		}
+
+		finalConfig = matchingConfigs.reduce((result, config) => {
+			return this[ConfigArraySymbol.schema].merge(result, config);
+		}, {}, this);
+
+		finalConfig = this[ConfigArraySymbol.finalizeConfig](finalConfig);
+
+		this[ConfigArraySymbol.configCache].set(filePath, finalConfig);
+
+		return finalConfig;
+	}
+
+}
+
+exports.ConfigArray = ConfigArray;
+exports.ConfigArraySymbol = ConfigArraySymbol;
diff --git a/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/package.json b/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/package.json
new file mode 100644
index 00000000000..4dc3a4e5d48
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/@humanwhocodes/config-array/package.json
@@ -0,0 +1,61 @@
+{
+  "name": "@humanwhocodes/config-array",
+  "version": "0.5.0",
+  "description": "Glob-based configuration matching.",
+  "author": "Nicholas C. Zakas",
+  "main": "api.js",
+  "files": [
+    "api.js"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/humanwhocodes/config-array.git"
+  },
+  "bugs": {
+    "url": "https://github.com/humanwhocodes/config-array/issues"
+  },
+  "homepage": "https://github.com/humanwhocodes/config-array#readme",
+  "scripts": {
+    "build": "rollup -c",
+    "format": "nitpik",
+    "lint": "eslint *.config.js src/*.js tests/*.js",
+    "prepublish": "npm run build",
+    "test:coverage": "nyc --include src/*.js npm run test",
+    "test": "mocha -r esm tests/ --recursive"
+  },
+  "gitHooks": {
+    "pre-commit": "lint-staged"
+  },
+  "lint-staged": {
+    "*.js": [
+      "nitpik",
+      "eslint --fix --ignore-pattern '!.eslintrc.js'"
+    ]
+  },
+  "keywords": [
+    "configuration",
+    "configarray",
+    "config file"
+  ],
+  "license": "Apache-2.0",
+  "engines": {
+    "node": ">=10.10.0"
+  },
+  "dependencies": {
+    "@humanwhocodes/object-schema": "^1.2.0",
+    "debug": "^4.1.1",
+    "minimatch": "^3.0.4"
+  },
+  "devDependencies": {
+    "@nitpik/javascript": "^0.3.3",
+    "@nitpik/node": "0.0.5",
+    "chai": "^4.2.0",
+    "eslint": "^6.7.1",
+    "esm": "^3.2.25",
+    "lint-staged": "^10.2.8",
+    "mocha": "^6.1.4",
+    "nyc": "^14.1.1",
+    "rollup": "^1.12.3",
+    "yorkie": "^2.0.0"
+  }
+}
\ No newline at end of file
diff --git a/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/LICENSE b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/LICENSE
new file mode 100644
index 00000000000..a5e3ae46fdf
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/LICENSE
@@ -0,0 +1,29 @@
+BSD 3-Clause License
+
+Copyright (c) 2019, Human Who Codes
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/README.md b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/README.md
new file mode 100644
index 00000000000..2163797f8fe
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/README.md
@@ -0,0 +1,234 @@
+# JavaScript ObjectSchema Package
+
+by [Nicholas C. Zakas](https://humanwhocodes.com)
+
+If you find this useful, please consider supporting my work with a [donation](https://humanwhocodes.com/donate).
+
+## Overview
+
+A JavaScript object merge/validation utility where you can define a different merge and validation strategy for each key. This is helpful when you need to validate complex data structures and then merge them in a way that is more complex than `Object.assign()`.
+
+## Installation
+
+You can install using either npm:
+
+```
+npm install @humanwhocodes/object-schema
+```
+
+Or Yarn:
+
+```
+yarn add @humanwhocodes/object-schema
+```
+
+## Usage
+
+Use CommonJS to get access to the `ObjectSchema` constructor:
+
+```js
+const { ObjectSchema } = require("@humanwhocodes/object-schema");
+
+const schema = new ObjectSchema({
+
+    // define a definition for the "downloads" key
+    downloads: {
+        required: true,
+        merge(value1, value2) {
+            return value1 + value2;
+        },
+        validate(value) {
+            if (typeof value !== "number") {
+                throw new Error("Expected downloads to be a number.");
+            }
+        }
+    },
+
+    // define a strategy for the "versions" key
+    version: {
+        required: true,
+        merge(value1, value2) {
+            return value1.concat(value2);
+        },
+        validate(value) {
+            if (!Array.isArray(value)) {
+                throw new Error("Expected versions to be an array.");
+            }
+        }
+    }
+});
+
+const record1 = {
+    downloads: 25,
+    versions: [
+        "v1.0.0",
+        "v1.1.0",
+        "v1.2.0"
+    ]
+};
+
+const record2 = {
+    downloads: 125,
+    versions: [
+        "v2.0.0",
+        "v2.1.0",
+        "v3.0.0"
+    ]
+};
+
+// make sure the records are valid
+schema.validate(record1);
+schema.validate(record2);
+
+// merge together (schema.merge() accepts any number of objects)
+const result = schema.merge(record1, record2);
+
+// result looks like this:
+
+const result = {
+    downloads: 75,
+    versions: [
+        "v1.0.0",
+        "v1.1.0",
+        "v1.2.0",
+        "v2.0.0",
+        "v2.1.0",
+        "v3.0.0"
+    ]
+};
+```
+
+## Tips and Tricks
+
+### Named merge strategies
+
+Instead of specifying a `merge()` method, you can specify one of the following strings to use a default merge strategy:
+
+* `"assign"` - use `Object.assign()` to merge the two values into one object.
+* `"overwrite"` - the second value always replaces the first.
+* `"replace"` - the second value replaces the first if the second is not `undefined`.
+
+For example:
+
+```js
+const schema = new ObjectSchema({
+    name: {
+        merge: "replace",
+        validate() {}
+    }
+});
+```
+
+### Named validation strategies
+
+Instead of specifying a `validate()` method, you can specify one of the following strings to use a default validation strategy:
+
+* `"array"` - value must be an array.
+* `"boolean"` - value must be a boolean.
+* `"number"` - value must be a number.
+* `"object"` - value must be an object.
+* `"object?"` - value must be an object or null.
+* `"string"` - value must be a string.
+* `"string!"` - value must be a non-empty string.
+
+For example:
+
+```js
+const schema = new ObjectSchema({
+    name: {
+        merge: "replace",
+        validate: "string"
+    }
+});
+```
+
+### Subschemas
+
+If you are defining a key that is, itself, an object, you can simplify the process by using a subschema. Instead of defining `merge()` and `validate()`, assign a `schema` key that contains a schema definition, like this:
+
+```js
+const schema = new ObjectSchema({
+    name: {
+        schema: {
+            first: {
+                merge: "replace",
+                validate: "string"
+            },
+            last: {
+                merge: "replace",
+                validate: "string"
+            }
+        }
+    }
+});
+
+schema.validate({
+    name: {
+        first: "n",
+        last: "z"
+    }
+});
+```
+
+### Remove Keys During Merge
+
+If the merge strategy for a key returns `undefined`, then the key will not appear in the final object. For example:
+
+```js
+const schema = new ObjectSchema({
+    date: {
+        merge() {
+            return undefined;
+        },
+        validate(value) {
+            Date.parse(value);  // throws an error when invalid
+        }
+    }
+});
+
+const object1 = { date: "5/5/2005" };
+const object2 = { date: "6/6/2006" };
+
+const result = schema.merge(object1, object2);
+
+console.log("date" in result);  // false
+```
+
+### Requiring Another Key Be Present
+
+If you'd like the presence of one key to require the presence of another key, you can use the `requires` property to specify an array of other properties that any key requires. For example:
+
+```js
+const schema = new ObjectSchema();
+
+const schema = new ObjectSchema({
+    date: {
+        merge() {
+            return undefined;
+        },
+        validate(value) {
+            Date.parse(value);  // throws an error when invalid
+        }
+    },
+    time: {
+        requires: ["date"],
+        merge(first, second) {
+            return second;
+        },
+        validate(value) {
+            // ...
+        }
+    }
+});
+
+// throws error: Key "time" requires keys "date"
+schema.validate({
+    time: "13:45"
+});
+```
+
+In this example, even though `date` is an optional key, it is required to be present whenever `time` is present.
+
+## License
+
+BSD 3-Clause
diff --git a/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/package.json b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/package.json
new file mode 100644
index 00000000000..ba829090e55
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/package.json
@@ -0,0 +1,33 @@
+{
+  "name": "@humanwhocodes/object-schema",
+  "version": "1.2.0",
+  "description": "An object schema merger/validator",
+  "main": "src/index.js",
+  "directories": {
+    "test": "tests"
+  },
+  "scripts": {
+    "test": "mocha tests/"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/humanwhocodes/object-schema.git"
+  },
+  "keywords": [
+    "object",
+    "validation",
+    "schema",
+    "merge"
+  ],
+  "author": "Nicholas C. Zakas",
+  "license": "BSD-3-Clause",
+  "bugs": {
+    "url": "https://github.com/humanwhocodes/object-schema/issues"
+  },
+  "homepage": "https://github.com/humanwhocodes/object-schema#readme",
+  "devDependencies": {
+    "chai": "^4.2.0",
+    "eslint": "^5.13.0",
+    "mocha": "^5.2.0"
+  }
+}
\ No newline at end of file
diff --git a/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/index.js b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/index.js
new file mode 100644
index 00000000000..b2bc4fb96e3
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/index.js
@@ -0,0 +1,7 @@
+/**
+ * @filedescription Object Schema Package
+ */
+
+exports.ObjectSchema = require("./object-schema").ObjectSchema;
+exports.MergeStrategy = require("./merge-strategy").MergeStrategy;
+exports.ValidationStrategy = require("./validation-strategy").ValidationStrategy;
diff --git a/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/merge-strategy.js b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/merge-strategy.js
new file mode 100644
index 00000000000..82174492764
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/merge-strategy.js
@@ -0,0 +1,53 @@
+/**
+ * @filedescription Merge Strategy
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Class
+//-----------------------------------------------------------------------------
+
+/**
+ * Container class for several different merge strategies.
+ */
+class MergeStrategy {
+
+    /**
+     * Merges two keys by overwriting the first with the second.
+     * @param {*} value1 The value from the first object key. 
+     * @param {*} value2 The value from the second object key.
+     * @returns {*} The second value.
+     */
+    static overwrite(value1, value2) {
+        return value2;
+    }
+
+    /**
+     * Merges two keys by replacing the first with the second only if the
+     * second is defined.
+     * @param {*} value1 The value from the first object key. 
+     * @param {*} value2 The value from the second object key.
+     * @returns {*} The second value if it is defined.
+     */
+    static replace(value1, value2) {
+        if (typeof value2 !== "undefined") {
+            return value2;
+        }
+
+        return value1;
+    }
+
+    /**
+     * Merges two properties by assigning properties from the second to the first.
+     * @param {*} value1 The value from the first object key.
+     * @param {*} value2 The value from the second object key.
+     * @returns {*} A new object containing properties from both value1 and
+     *      value2.
+     */
+    static assign(value1, value2) {
+        return Object.assign({}, value1, value2);
+    }
+}
+
+exports.MergeStrategy = MergeStrategy;
diff --git a/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/object-schema.js b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/object-schema.js
new file mode 100644
index 00000000000..25864f5a280
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/object-schema.js
@@ -0,0 +1,239 @@
+/**
+ * @filedescription Object Schema
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Requirements
+//-----------------------------------------------------------------------------
+
+const { MergeStrategy } = require("./merge-strategy");
+const { ValidationStrategy } = require("./validation-strategy");
+
+//-----------------------------------------------------------------------------
+// Private
+//-----------------------------------------------------------------------------
+
+const strategies = Symbol("strategies");
+const requiredKeys = Symbol("requiredKeys");
+
+/**
+ * Validates a schema strategy.
+ * @param {string} name The name of the key this strategy is for.
+ * @param {Object} strategy The strategy for the object key.
+ * @param {boolean} [strategy.required=true] Whether the key is required.
+ * @param {string[]} [strategy.requires] Other keys that are required when
+ *      this key is present.
+ * @param {Function} strategy.merge A method to call when merging two objects
+ *      with the same key.
+ * @param {Function} strategy.validate A method to call when validating an
+ *      object with the key.
+ * @returns {void}
+ * @throws {Error} When the strategy is missing a name.
+ * @throws {Error} When the strategy is missing a merge() method.
+ * @throws {Error} When the strategy is missing a validate() method.
+ */
+function validateDefinition(name, strategy) {
+
+    let hasSchema = false;
+    if (strategy.schema) {
+        if (typeof strategy.schema === "object") {
+            hasSchema = true;
+        } else {
+            throw new TypeError("Schema must be an object.");
+        }
+    }
+
+    if (typeof strategy.merge === "string") {
+        if (!(strategy.merge in MergeStrategy)) {
+            throw new TypeError(`Definition for key "${name}" missing valid merge strategy.`);
+        }
+    } else if (!hasSchema && typeof strategy.merge !== "function") {
+        throw new TypeError(`Definition for key "${name}" must have a merge property.`);
+    }
+
+    if (typeof strategy.validate === "string") {
+        if (!(strategy.validate in ValidationStrategy)) {
+            throw new TypeError(`Definition for key "${name}" missing valid validation strategy.`);
+        }
+    } else if (!hasSchema && typeof strategy.validate !== "function") {
+        throw new TypeError(`Definition for key "${name}" must have a validate() method.`);
+    }
+}
+
+
+//-----------------------------------------------------------------------------
+// Class
+//-----------------------------------------------------------------------------
+
+/**
+ * Represents an object validation/merging schema.
+ */
+class ObjectSchema {
+
+    /**
+     * Creates a new instance.
+     */
+    constructor(definitions) {
+
+        if (!definitions) {
+            throw new Error("Schema definitions missing.");
+        }
+
+        /**
+         * Track all strategies in the schema by key.
+         * @type {Map}
+         * @property strategies
+         */
+        this[strategies] = new Map();
+
+        /**
+         * Separately track any keys that are required for faster validation.
+         * @type {Map}
+         * @property requiredKeys
+         */
+        this[requiredKeys] = new Map();
+
+        // add in all strategies
+        for (const key of Object.keys(definitions)) {
+            validateDefinition(key, definitions[key]);
+
+            // normalize merge and validate methods if subschema is present
+            if (typeof definitions[key].schema === "object") {
+                const schema = new ObjectSchema(definitions[key].schema);
+                definitions[key] = {
+                    ...definitions[key],
+                    merge(first, second) {
+                        if (first && second) {
+                            return schema.merge(first, second);
+                        }
+                        
+                        return MergeStrategy.assign(first, second);
+                    },
+                    validate(value) {
+                        ValidationStrategy.object(value);
+                        schema.validate(value);
+                    }
+                };
+            }
+
+            // normalize the merge method in case there's a string
+            if (typeof definitions[key].merge === "string") {
+                definitions[key] = {
+                    ...definitions[key],
+                    merge: MergeStrategy[definitions[key].merge]
+                };
+            };
+
+            // normalize the validate method in case there's a string
+            if (typeof definitions[key].validate === "string") {
+                definitions[key] = {
+                    ...definitions[key],
+                    validate: ValidationStrategy[definitions[key].validate]
+                };
+            };
+
+            this[strategies].set(key, definitions[key]);
+
+            if (definitions[key].required) {
+                this[requiredKeys].set(key, definitions[key]);
+            }
+        }
+    }
+
+    /**
+     * Determines if a strategy has been registered for the given object key.
+     * @param {string} key The object key to find a strategy for.
+     * @returns {boolean} True if the key has a strategy registered, false if not. 
+     */
+    hasKey(key) {
+        return this[strategies].has(key);
+    }
+
+    /**
+     * Merges objects together to create a new object comprised of the keys
+     * of the all objects. Keys are merged based on the each key's merge
+     * strategy.
+     * @param {...Object} objects The objects to merge.
+     * @returns {Object} A new object with a mix of all objects' keys.
+     * @throws {Error} If any object is invalid.
+     */
+    merge(...objects) {
+
+        // double check arguments
+        if (objects.length < 2) {
+            throw new Error("merge() requires at least two arguments.");
+        }
+
+        if (objects.some(object => (object == null || typeof object !== "object"))) {
+            throw new Error("All arguments must be objects.");
+        }
+
+        return objects.reduce((result, object) => {
+            
+            this.validate(object);
+            
+            for (const [key, strategy] of this[strategies]) {
+                try {
+                    if (key in result || key in object) {
+                        const value = strategy.merge.call(this, result[key], object[key]);
+                        if (value !== undefined) {
+                            result[key] = value;
+                        }
+                    }
+                } catch (ex) {
+                    ex.message = `Key "${key}": ` + ex.message;
+                    throw ex;
+                }
+            }
+            return result;
+        }, {});
+    }
+
+    /**
+     * Validates an object's keys based on the validate strategy for each key.
+     * @param {Object} object The object to validate.
+     * @returns {void}
+     * @throws {Error} When the object is invalid. 
+     */
+    validate(object) {
+
+        // check existing keys first
+        for (const key of Object.keys(object)) {
+
+            // check to see if the key is defined
+            if (!this.hasKey(key)) {
+                throw new Error(`Unexpected key "${key}" found.`);
+            }
+
+            // validate existing keys
+            const strategy = this[strategies].get(key);
+
+            // first check to see if any other keys are required
+            if (Array.isArray(strategy.requires)) {
+                if (!strategy.requires.every(otherKey => otherKey in object)) {
+                    throw new Error(`Key "${key}" requires keys "${strategy.requires.join("\", \"")}".`);
+                }
+            }
+
+            // now apply remaining validation strategy
+            try {
+                strategy.validate.call(strategy, object[key]);
+            } catch (ex) {
+                ex.message = `Key "${key}": ` + ex.message;
+                throw ex;
+            }
+        }
+
+        // ensure required keys aren't missing
+        for (const [key] of this[requiredKeys]) {
+            if (!(key in object)) {
+                throw new Error(`Missing required key "${key}".`);
+            }
+        }
+
+    }
+}
+
+exports.ObjectSchema = ObjectSchema;
diff --git a/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/validation-strategy.js b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/validation-strategy.js
new file mode 100644
index 00000000000..ecf918bdd17
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/@humanwhocodes/object-schema/src/validation-strategy.js
@@ -0,0 +1,102 @@
+/**
+ * @filedescription Validation Strategy
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Class
+//-----------------------------------------------------------------------------
+
+/**
+ * Container class for several different validation strategies.
+ */
+class ValidationStrategy {
+
+    /**
+     * Validates that a value is an array.
+     * @param {*} value The value to validate.
+     * @returns {void}
+     * @throws {TypeError} If the value is invalid. 
+     */
+    static array(value) {
+        if (!Array.isArray(value)) {
+            throw new TypeError("Expected an array.");
+        }
+    }
+
+    /**
+     * Validates that a value is a boolean.
+     * @param {*} value The value to validate.
+     * @returns {void}
+     * @throws {TypeError} If the value is invalid. 
+     */
+    static boolean(value) {
+        if (typeof value !== "boolean") {
+            throw new TypeError("Expected a Boolean.");
+        }
+    }
+
+    /**
+     * Validates that a value is a number.
+     * @param {*} value The value to validate.
+     * @returns {void}
+     * @throws {TypeError} If the value is invalid. 
+     */
+    static number(value) {
+        if (typeof value !== "number") {
+            throw new TypeError("Expected a number.");
+        }
+    }
+
+    /**
+     * Validates that a value is a object.
+     * @param {*} value The value to validate.
+     * @returns {void}
+     * @throws {TypeError} If the value is invalid. 
+     */
+    static object(value) {
+        if (!value || typeof value !== "object") {
+            throw new TypeError("Expected an object.");
+        }
+    }
+
+    /**
+     * Validates that a value is a object or null.
+     * @param {*} value The value to validate.
+     * @returns {void}
+     * @throws {TypeError} If the value is invalid. 
+     */
+    static "object?"(value) {
+        if (typeof value !== "object") {
+            throw new TypeError("Expected an object or null.");
+        }
+    }
+
+    /**
+     * Validates that a value is a string.
+     * @param {*} value The value to validate.
+     * @returns {void}
+     * @throws {TypeError} If the value is invalid. 
+     */
+    static string(value) {
+        if (typeof value !== "string") {
+            throw new TypeError("Expected a string.");
+        }
+    }
+
+    /**
+     * Validates that a value is a non-empty string.
+     * @param {*} value The value to validate.
+     * @returns {void}
+     * @throws {TypeError} If the value is invalid. 
+     */
+    static "string!"(value) {
+        if (typeof value !== "string" || value.length === 0) {
+            throw new TypeError("Expected a non-empty string.");
+        }
+    }
+
+}
+
+exports.ValidationStrategy = ValidationStrategy;
diff --git a/tools/node_modules/eslint/node_modules/flatted/README.md b/tools/node_modules/eslint/node_modules/flatted/README.md
index 0c1627f7d2d..8fd5b4d82f4 100644
--- a/tools/node_modules/eslint/node_modules/flatted/README.md
+++ b/tools/node_modules/eslint/node_modules/flatted/README.md
@@ -18,10 +18,10 @@ Usable via [CDN](https://unpkg.com/flatted) or as regular module.
 
 ```js
 // ESM
-import {parse, stringify} from 'flatted';
+import {parse, stringify, toJSON, fromJSON} from 'flatted';
 
 // CJS
-const {parse, stringify} = require('flatted');
+const {parse, stringify, toJSON, fromJSON} = require('flatted');
 
 const a = [{}];
 a[0].a = a;
@@ -30,6 +30,34 @@ a.push(a);
 stringify(a); // [["1","0"],{"a":"0"}]
 ```
 
+## toJSON and from JSON
+
+If you'd like to implicitly survive JSON serialization, these two helpers helps:
+
+```js
+import {toJSON, fromJSON} from 'flatted';
+
+class RecursiveMap extends Map {
+  static fromJSON(any) {
+    return new this(fromJSON(any));
+  }
+  toJSON() {
+    return toJSON([...this.entries()]);
+  }
+}
+
+const recursive = new RecursiveMap;
+const same = {};
+same.same = same;
+recursive.set('same', same);
+
+const asString = JSON.stringify(recursive);
+const asMap = RecursiveMap.fromJSON(JSON.parse(asString));
+asMap.get('same') === asMap.get('same').same;
+// true
+```
+
+
 ## Flatted VS JSON
 
 As it is for every other specialized format capable of serializing and deserializing circular data, you should never `JSON.parse(Flatted.stringify(data))`, and you should never `Flatted.parse(JSON.stringify(data))`.
diff --git a/tools/node_modules/eslint/node_modules/flatted/cjs/index.js b/tools/node_modules/eslint/node_modules/flatted/cjs/index.js
index ea7ac895154..c2c94866d33 100644
--- a/tools/node_modules/eslint/node_modules/flatted/cjs/index.js
+++ b/tools/node_modules/eslint/node_modules/flatted/cjs/index.js
@@ -92,3 +92,8 @@ const stringify = (value, replacer, space) => {
   }
 };
 exports.stringify = stringify;
+
+const toJSON = any => $parse(stringify(any));
+exports.toJSON = toJSON;
+const fromJSON = any => parse($stringify(any));
+exports.fromJSON = fromJSON;
diff --git a/tools/node_modules/eslint/node_modules/flatted/es.js b/tools/node_modules/eslint/node_modules/flatted/es.js
index aee7158d2f3..8e4cf0cf4ae 100644
--- a/tools/node_modules/eslint/node_modules/flatted/es.js
+++ b/tools/node_modules/eslint/node_modules/flatted/es.js
@@ -1,2 +1,2 @@
 self.Flatted=function(t){"use strict";
-/*! (c) 2020 Andrea Giammarchi */const{parse:e,stringify:n}=JSON,{keys:r}=Object,s=String,c="string",l={},o="object",a=(t,e)=>e,i=t=>t instanceof s?s(t):t,f=(t,e)=>typeof e===c?new s(e):e,u=(t,e,n,c)=>{const a=[];for(let i=r(n),{length:f}=i,u=0;u<f;u++){const r=i[u],f=n[r];if(f instanceof s){const s=t[f];typeof s!==o||e.has(s)?n[r]=c.call(n,r,s):(e.add(s),n[r]=l,a.push({k:r,a:[t,e,s,c]}))}else n[r]!==l&&(n[r]=c.call(n,r,f))}for(let{length:t}=a,e=0;e<t;e++){const{k:t,a:r}=a[e];n[t]=c.call(n,t,u.apply(null,r))}return n},p=(t,e,n)=>{const r=s(e.push(n)-1);return t.set(n,r),r};return t.parse=(t,n)=>{const r=e(t,f).map(i),s=r[0],c=n||a,l=typeof s===o&&s?u(r,new Set,s,c):s;return c.call({"":l},"",l)},t.stringify=(t,e,r)=>{const s=e&&typeof e===o?(t,n)=>""===t||-1<e.indexOf(t)?n:void 0:e||a,l=new Map,i=[],f=[];let u=+p(l,i,s.call({"":t},"",t)),y=!u;for(;u<i.length;)y=!0,f[u]=n(i[u++],g,r);return"["+f.join(",")+"]";function g(t,e){if(y)return y=!y,e;const n=s.call(this,t,e);switch(typeof n){case o:if(null===n)return n;case c:return l.get(n)||p(l,i,n)}return n}},t}({});
+/*! (c) 2020 Andrea Giammarchi */const{parse:e,stringify:n}=JSON,{keys:r}=Object,s=String,o="string",c={},l="object",a=(t,e)=>e,f=t=>t instanceof s?s(t):t,i=(t,e)=>typeof e===o?new s(e):e,u=(t,e,n,o)=>{const a=[];for(let f=r(n),{length:i}=f,u=0;u<i;u++){const r=f[u],i=n[r];if(i instanceof s){const s=t[i];typeof s!==l||e.has(s)?n[r]=o.call(n,r,s):(e.add(s),n[r]=c,a.push({k:r,a:[t,e,s,o]}))}else n[r]!==c&&(n[r]=o.call(n,r,i))}for(let{length:t}=a,e=0;e<t;e++){const{k:t,a:r}=a[e];n[t]=o.call(n,t,u.apply(null,r))}return n},p=(t,e,n)=>{const r=s(e.push(n)-1);return t.set(n,r),r},y=(t,n)=>{const r=e(t,i).map(f),s=r[0],o=n||a,c=typeof s===l&&s?u(r,new Set,s,o):s;return o.call({"":c},"",c)},g=(t,e,r)=>{const s=e&&typeof e===l?(t,n)=>""===t||-1<e.indexOf(t)?n:void 0:e||a,c=new Map,f=[],i=[];let u=+p(c,f,s.call({"":t},"",t)),y=!u;for(;u<f.length;)y=!0,i[u]=n(f[u++],g,r);return"["+i.join(",")+"]";function g(t,e){if(y)return y=!y,e;const n=s.call(this,t,e);switch(typeof n){case l:if(null===n)return n;case o:return c.get(n)||p(c,f,n)}return n}};return t.fromJSON=t=>y(n(t)),t.parse=y,t.stringify=g,t.toJSON=t=>e(g(t)),t}({});
diff --git a/tools/node_modules/eslint/node_modules/flatted/esm/index.js b/tools/node_modules/eslint/node_modules/flatted/esm/index.js
index f220bbf7a31..9a8c239c203 100644
--- a/tools/node_modules/eslint/node_modules/flatted/esm/index.js
+++ b/tools/node_modules/eslint/node_modules/flatted/esm/index.js
@@ -89,3 +89,6 @@ export const stringify = (value, replacer, space) => {
     return after;
   }
 };
+
+export const toJSON = any => $parse(stringify(any));
+export const fromJSON = any => parse($stringify(any));
diff --git a/tools/node_modules/eslint/node_modules/flatted/index.js b/tools/node_modules/eslint/node_modules/flatted/index.js
index 2cf0eeb52ab..d170879e50c 100644
--- a/tools/node_modules/eslint/node_modules/flatted/index.js
+++ b/tools/node_modules/eslint/node_modules/flatted/index.js
@@ -110,9 +110,17 @@ self.Flatted = (function (exports) {
       return after;
     }
   };
+  var toJSON = function toJSON(any) {
+    return $parse(stringify(any));
+  };
+  var fromJSON = function fromJSON(any) {
+    return parse($stringify(any));
+  };
 
+  exports.fromJSON = fromJSON;
   exports.parse = parse;
   exports.stringify = stringify;
+  exports.toJSON = toJSON;
 
   return exports;
 
diff --git a/tools/node_modules/eslint/node_modules/flatted/min.js b/tools/node_modules/eslint/node_modules/flatted/min.js
index 64372fe4081..a822de22434 100644
--- a/tools/node_modules/eslint/node_modules/flatted/min.js
+++ b/tools/node_modules/eslint/node_modules/flatted/min.js
@@ -1,2 +1,2 @@
 self.Flatted=function(n){"use strict";
-/*! (c) 2020 Andrea Giammarchi */var t=JSON.parse,r=JSON.stringify,e=Object.keys,a=String,u="string",f={},i="object",c=function(n,t){return t},l=function(n){return n instanceof a?a(n):n},o=function(n,t){return typeof t===u?new a(t):t},s=function(n,t,r){var e=a(t.push(r)-1);return n.set(r,e),e};return n.parse=function(n,r){var u=t(n,o).map(l),s=u[0],p=r||c,v=typeof s===i&&s?function n(t,r,u,c){for(var l=[],o=e(u),s=o.length,p=0;p<s;p++){var v=o[p],y=u[v];if(y instanceof a){var g=t[y];typeof g!==i||r.has(g)?u[v]=c.call(u,v,g):(r.add(g),u[v]=f,l.push({k:v,a:[t,r,g,c]}))}else u[v]!==f&&(u[v]=c.call(u,v,y))}for(var h=l.length,d=0;d<h;d++){var w=l[d],O=w.k,S=w.a;u[O]=c.call(u,O,n.apply(null,S))}return u}(u,new Set,s,p):s;return p.call({"":v},"",v)},n.stringify=function(n,t,e){for(var a=t&&typeof t===i?function(n,r){return""===n||-1<t.indexOf(n)?r:void 0}:t||c,f=new Map,l=[],o=[],p=+s(f,l,a.call({"":n},"",n)),v=!p;p<l.length;)v=!0,o[p]=r(l[p++],y,e);return"["+o.join(",")+"]";function y(n,t){if(v)return v=!v,t;var r=a.call(this,n,t);switch(typeof r){case i:if(null===r)return r;case u:return f.get(r)||s(f,l,r)}return r}},n}({});
\ No newline at end of file
+/*! (c) 2020 Andrea Giammarchi */var t=JSON.parse,r=JSON.stringify,e=Object.keys,u=String,a="string",f={},i="object",o=function(n,t){return t},c=function(n){return n instanceof u?u(n):n},l=function(n,t){return typeof t===a?new u(t):t},s=function n(t,r,a,o){for(var c=[],l=e(a),s=l.length,p=0;p<s;p++){var v=l[p],y=a[v];if(y instanceof u){var g=t[y];typeof g!==i||r.has(g)?a[v]=o.call(a,v,g):(r.add(g),a[v]=f,c.push({k:v,a:[t,r,g,o]}))}else a[v]!==f&&(a[v]=o.call(a,v,y))}for(var h=c.length,O=0;O<h;O++){var S=c[O],d=S.k,w=S.a;a[d]=o.call(a,d,n.apply(null,w))}return a},p=function(n,t,r){var e=u(t.push(r)-1);return n.set(r,e),e},v=function(n,r){var e=t(n,l).map(c),u=e[0],a=r||o,f=typeof u===i&&u?s(e,new Set,u,a):u;return a.call({"":f},"",f)},y=function(n,t,e){for(var u=t&&typeof t===i?function(n,r){return""===n||-1<t.indexOf(n)?r:void 0}:t||o,f=new Map,c=[],l=[],s=+p(f,c,u.call({"":n},"",n)),v=!s;s<c.length;)v=!0,l[s]=r(c[s++],y,e);return"["+l.join(",")+"]";function y(n,t){if(v)return v=!v,t;var r=u.call(this,n,t);switch(typeof r){case i:if(null===r)return r;case a:return f.get(r)||p(f,c,r)}return r}};return n.fromJSON=function(n){return v(r(n))},n.parse=v,n.stringify=y,n.toJSON=function(n){return t(y(n))},n}({});
\ No newline at end of file
diff --git a/tools/node_modules/eslint/node_modules/flatted/package.json b/tools/node_modules/eslint/node_modules/flatted/package.json
index 7b106e797c1..01372892910 100644
--- a/tools/node_modules/eslint/node_modules/flatted/package.json
+++ b/tools/node_modules/eslint/node_modules/flatted/package.json
@@ -1,6 +1,6 @@
 {
   "name": "flatted",
-  "version": "3.1.1",
+  "version": "3.2.0",
   "description": "A super light and fast circular JSON parser.",
   "unpkg": "min.js",
   "types": "types.d.ts",
@@ -33,20 +33,20 @@
   },
   "homepage": "https://github.com/WebReflection/flatted#readme",
   "devDependencies": {
-    "@babel/core": "^7.11.6",
-    "@babel/preset-env": "^7.11.5",
-    "ascjs": "^4.0.1",
+    "@babel/core": "^7.14.6",
+    "@babel/preset-env": "^7.14.7",
+    "ascjs": "^5.0.1",
     "circular-json": "^0.5.9",
     "circular-json-es6": "^2.0.2",
-    "coveralls": "^3.1.0",
+    "coveralls": "^3.1.1",
     "drop-babel-typeof": "^1.0.3",
     "jsan": "^3.1.13",
     "nyc": "^15.1.0",
-    "rollup": "^2.26.11",
+    "rollup": "^2.52.6",
     "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-terser": "^7.0.2",
-    "terser": "^5.3.0"
+    "terser": "^5.7.1"
   },
   "module": "./esm/index.js",
   "type": "module",
diff --git a/tools/node_modules/eslint/node_modules/flatted/php/flatted.php b/tools/node_modules/eslint/node_modules/flatted/php/flatted.php
index 31c0d41d453..30585bf9455 100644
--- a/tools/node_modules/eslint/node_modules/flatted/php/flatted.php
+++ b/tools/node_modules/eslint/node_modules/flatted/php/flatted.php
@@ -3,7 +3,7 @@
 /*!
  * ISC License
  * 
- * Copyright (c) 2018-2020, Andrea Giammarchi, @WebReflection
+ * Copyright (c) 2018-2021, Andrea Giammarchi, @WebReflection
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -60,7 +60,7 @@ class Flatted {
   }
 
   // private helpers
-  private static function asString(&$value) {
+  private static function asString($value) {
     return $value instanceof FlattedString ? $value->value : $value;
   }
 
@@ -76,42 +76,25 @@ class Flatted {
     $obj = new ReflectionObject($value);
     $props = $obj->getProperties();
     $keys = array();
-    foreach ($props as $prop) {
+    foreach ($props as $prop)
       $keys[] = $prop->getName();
-    }
     return $keys;
   }
 
   private static function loop($obj, $keys, &$input, &$set, &$output) {
     foreach ($keys as $key) {
       $value = $obj ? $output->$key : $output[$key];
-      if ($value instanceof FlattedString) {
+      if ($value instanceof FlattedString)
         Flatted::ref($obj, $key, $input[$value->value], $input, $set, $output);
-      }
     }
     return $output;
   }
 
   private static function relate(&$known, &$input, &$value) {
-    if (is_string($value)) {
-      $key = array_search($value, $known->key, true);
-      if ($key !== false) {
-        return $known->value[$key];
-      }
-      return Flatted::index($known, $input, $value);
-    }
-    if (is_array($value)) {
+    if (is_string($value) || is_array($value) || is_object($value)) {
       $key = array_search($value, $known->key, true);
-      if ($key !== false) {
+      if ($key !== false)
         return $known->value[$key];
-      }
-      return Flatted::index($known, $input, $value);
-    }
-    if (is_object($value)) {
-      $key = array_search($value, $known->key, true);
-      if ($key !== false) {
-        return $known->value[$key];
-      }
       return Flatted::index($known, $input, $value);
     }
     return $value;
@@ -137,7 +120,7 @@ class Flatted {
   private static function transform(&$known, &$input, &$value) {
     if (is_array($value)) {
       return array_map(
-        function (&$value) use(&$known, &$input) {
+        function ($value) use(&$known, &$input) {
           return Flatted::relate($known, $input, $value);
         },
         $value
@@ -146,15 +129,14 @@ class Flatted {
     if (is_object($value)) {
       $object = new stdClass;
       $keys = Flatted::keys($value);
-      foreach ($keys as $key) {
+      foreach ($keys as $key)
         $object->$key = Flatted::relate($known, $input, $value->$key);
-      }
       return $object;
     }
     return $value;
   }
 
-  private static function wrap(&$value) {
+  private static function wrap($value) {
     if (is_string($value)) {
       return new FlattedString($value);
     }
diff --git a/tools/node_modules/eslint/package.json b/tools/node_modules/eslint/package.json
index f556a550356..ac3a78cc3b0 100644
--- a/tools/node_modules/eslint/package.json
+++ b/tools/node_modules/eslint/package.json
@@ -1,6 +1,6 @@
 {
   "name": "eslint",
-  "version": "7.29.0",
+  "version": "7.30.0",
   "author": "Nicholas C. Zakas <nicholas+npm@nczconsulting.com>",
   "description": "An AST-based pattern checker for JavaScript.",
   "bin": {
@@ -45,6 +45,7 @@
   "dependencies": {
     "@babel/code-frame": "7.12.11",
     "@eslint/eslintrc": "^0.4.2",
+    "@humanwhocodes/config-array": "^0.5.0",
     "ajv": "^6.10.0",
     "chalk": "^4.0.0",
     "cross-spawn": "^7.0.2",
@@ -95,7 +96,7 @@
     "ejs": "^3.0.2",
     "eslint": "file:.",
     "eslint-config-eslint": "file:packages/eslint-config-eslint",
-    "eslint-plugin-eslint-plugin": "^3.0.3",
+    "eslint-plugin-eslint-plugin": "^3.2.0",
     "eslint-plugin-internal-rules": "file:tools/internal-rules",
     "eslint-plugin-jsdoc": "^25.4.3",
     "eslint-plugin-node": "^11.1.0",