testing js app

node_modules/jest-leak-detector/LICENSE

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+MIT License
+
+Copyright (c) Facebook, Inc. and its affiliates.
+
+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.

node_modules/jest-leak-detector/README.md

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+# jest-leak-detector
+
+Module for verifying whether an object has been garbage collected or not.
+
+Internally creates a weak reference to the object, and forces garbage collection to happen. If the reference is gone, it meant no one else was pointing to the object.
+
+## Example
+
+```javascript
+(async function () {
+  let reference = {};
+  let isLeaking;
+
+  const detector = new LeakDetector(reference);
+
+  // Reference is held in memory.
+  isLeaking = await detector.isLeaking();
+  console.log(isLeaking); // true
+
+  // We destroy the only reference to the object.
+  reference = null;
+
+  // Reference is gone.
+  isLeaking = await detector.isLeaking();
+  console.log(isLeaking); // false
+})();
+```

node_modules/jest-leak-detector/build/index.d.ts

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+/// <reference lib="es2021.weakref" />
+
+/// <reference lib="es2021.weakref" />
+declare class LeakDetector {
+  private _isReferenceBeingHeld;
+  private _finalizationRegistry?;
+  constructor(value: unknown);
+  isLeaking(): Promise<boolean>;
+  private _runGarbageCollector;
+}
+export default LeakDetector;
+
+export {};

node_modules/jest-leak-detector/build/index.js

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+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.default = void 0;
+
+function _util() {
+  const data = require('util');
+
+  _util = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _v() {
+  const data = require('v8');
+
+  _v = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _vm() {
+  const data = require('vm');
+
+  _vm = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _jestGetType() {
+  const data = require('jest-get-type');
+
+  _jestGetType = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _prettyFormat() {
+  const data = require('pretty-format');
+
+  _prettyFormat = function () {
+    return data;
+  };
+
+  return data;
+}
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+/// <reference lib="es2021.WeakRef" />
+const tick = (0, _util().promisify)(setImmediate);
+
+class LeakDetector {
+  _isReferenceBeingHeld;
+  _finalizationRegistry;
+
+  constructor(value) {
+    if ((0, _jestGetType().isPrimitive)(value)) {
+      throw new TypeError(
+        [
+          'Primitives cannot leak memory.',
+          `You passed a ${typeof value}: <${(0, _prettyFormat().format)(
+            value
+          )}>`
+        ].join(' ')
+      );
+    } // TODO: Remove the `if` and `weak-napi` when we drop node 12, as v14 supports FinalizationRegistry
+
+    if (globalThis.FinalizationRegistry) {
+      // When `_finalizationRegistry` is GCed the callback we set will no longer be called,
+      // so we need to assign it to `this` to keep it referenced
+      this._finalizationRegistry = new FinalizationRegistry(() => {
+        this._isReferenceBeingHeld = false;
+      });
+
+      this._finalizationRegistry.register(value, undefined);
+    } else {
+      let weak;
+
+      try {
+        // eslint-disable-next-line import/no-extraneous-dependencies
+        weak = require('weak-napi');
+      } catch (err) {
+        if (!err || err.code !== 'MODULE_NOT_FOUND') {
+          throw err;
+        }
+
+        throw new Error(
+          'The leaking detection mechanism requires newer version of node that supports ' +
+            'FinalizationRegistry, update your node or install the "weak-napi" package ' +
+            'which support current node version as a dependency on your main project.'
+        );
+      }
+
+      weak(value, () => (this._isReferenceBeingHeld = false));
+    }
+
+    this._isReferenceBeingHeld = true; // Ensure value is not leaked by the closure created by the "weak" callback.
+
+    value = null;
+  }
+
+  async isLeaking() {
+    this._runGarbageCollector(); // wait some ticks to allow GC to run properly, see https://github.com/nodejs/node/issues/34636#issuecomment-669366235
+
+    for (let i = 0; i < 10; i++) {
+      await tick();
+    }
+
+    return this._isReferenceBeingHeld;
+  }
+
+  _runGarbageCollector() {
+    // @ts-expect-error: not a function on `globalThis`
+    const isGarbageCollectorHidden = globalThis.gc == null; // GC is usually hidden, so we have to expose it before running.
+
+    (0, _v().setFlagsFromString)('--expose-gc');
+    (0, _vm().runInNewContext)('gc')(); // The GC was not initially exposed, so let's hide it again.
+
+    if (isGarbageCollectorHidden) {
+      (0, _v().setFlagsFromString)('--no-expose-gc');
+    }
+  }
+}
+
+exports.default = LeakDetector;

node_modules/jest-leak-detector/package.json

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+{
+  "name": "jest-leak-detector",
+  "version": "28.1.3",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/facebook/jest.git",
+    "directory": "packages/jest-leak-detector"
+  },
+  "license": "MIT",
+  "main": "./build/index.js",
+  "types": "./build/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./build/index.d.ts",
+      "default": "./build/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "dependencies": {
+    "jest-get-type": "^28.0.2",
+    "pretty-format": "^28.1.3"
+  },
+  "devDependencies": {
+    "@types/weak-napi": "^2.0.0",
+    "weak-napi": "^2.0.1"
+  },
+  "engines": {
+    "node": "^12.13.0 || ^14.15.0 || ^16.10.0 || >=17.0.0"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "gitHead": "2cce069800dab3fc8ca7c469b32d2e2b2f7e2bb1"
+}