81 lines
2.3 KiB
JavaScript
81 lines
2.3 KiB
JavaScript
/**
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* Copyright (c) 2017-present, Facebook, Inc. All rights reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*
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*/
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'use strict';Object.defineProperty(exports, "__esModule", { value: true });var _prettyFormat;
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function _load_prettyFormat() {return _prettyFormat = _interopRequireDefault(require('pretty-format'));}var _v;
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function _load_v() {return _v = _interopRequireDefault(require('v8'));}var _vm;
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function _load_vm() {return _vm = _interopRequireDefault(require('vm'));}function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { default: obj };}
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const PRIMITIVE_TYPES = new Set([
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'undefined',
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'boolean',
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'number',
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'string',
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'symbol']);exports.default =
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class {
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constructor(value) {
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if (this._isPrimitive(value)) {
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throw new TypeError(
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[
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'Primitives cannot leak memory.',
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'You passed a ' + typeof value + ': <' + (0, (_prettyFormat || _load_prettyFormat()).default)(value) + '>'].
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join(' '));
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}
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let weak;
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try {
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// eslint-disable-next-line import/no-extraneous-dependencies
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weak = require('weak');
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} catch (err) {
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if (!err || err.code !== 'MODULE_NOT_FOUND') {
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throw err;
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}
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throw new Error(
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'The leaking detection mechanism requires the "weak" package to be installed and work. ' +
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'Please install it as a dependency on your main project');
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}
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weak(value, () => this._isReferenceBeingHeld = false);
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this._isReferenceBeingHeld = true;
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// Ensure value is not leaked by the closure created by the "weak" callback.
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value = null;
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}
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isLeaking() {
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this._runGarbageCollector();
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return this._isReferenceBeingHeld;
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}
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_runGarbageCollector() {
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const isGarbageCollectorHidden = !global.gc;
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// GC is usually hidden, so we have to expose it before running.
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(_v || _load_v()).default.setFlagsFromString('--expose-gc');
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(_vm || _load_vm()).default.runInNewContext('gc')();
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// The GC was not initially exposed, so let's hide it again.
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if (isGarbageCollectorHidden) {
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(_v || _load_v()).default.setFlagsFromString('--no-expose-gc');
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}
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}
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_isPrimitive(value) {
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return value === null || PRIMITIVE_TYPES.has(typeof value);
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}}; |