GT2/GT2-iOS/node_modules/jest-leak-detector/build/index.js

81 lines
2.3 KiB
JavaScript

/**
* Copyright (c) 2017-present, Facebook, Inc. 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.
*
*
*/
'use strict';Object.defineProperty(exports, "__esModule", { value: true });var _prettyFormat;
function _load_prettyFormat() {return _prettyFormat = _interopRequireDefault(require('pretty-format'));}var _v;
function _load_v() {return _v = _interopRequireDefault(require('v8'));}var _vm;
function _load_vm() {return _vm = _interopRequireDefault(require('vm'));}function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { default: obj };}
const PRIMITIVE_TYPES = new Set([
'undefined',
'boolean',
'number',
'string',
'symbol']);exports.default =
class {
constructor(value) {
if (this._isPrimitive(value)) {
throw new TypeError(
[
'Primitives cannot leak memory.',
'You passed a ' + typeof value + ': <' + (0, (_prettyFormat || _load_prettyFormat()).default)(value) + '>'].
join(' '));
}
let weak;
try {
// eslint-disable-next-line import/no-extraneous-dependencies
weak = require('weak');
} catch (err) {
if (!err || err.code !== 'MODULE_NOT_FOUND') {
throw err;
}
throw new Error(
'The leaking detection mechanism requires the "weak" package to be installed and work. ' +
'Please install it 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;
}
isLeaking() {
this._runGarbageCollector();
return this._isReferenceBeingHeld;
}
_runGarbageCollector() {
const isGarbageCollectorHidden = !global.gc;
// GC is usually hidden, so we have to expose it before running.
(_v || _load_v()).default.setFlagsFromString('--expose-gc');
(_vm || _load_vm()).default.runInNewContext('gc')();
// The GC was not initially exposed, so let's hide it again.
if (isGarbageCollectorHidden) {
(_v || _load_v()).default.setFlagsFromString('--no-expose-gc');
}
}
_isPrimitive(value) {
return value === null || PRIMITIVE_TYPES.has(typeof value);
}};