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

100 lines
2.5 KiB
JavaScript

'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(' ')
);
}
// When `_finalizationRegistry` is GCed the callback we set will no longer be called,
this._finalizationRegistry = new FinalizationRegistry(() => {
this._isReferenceBeingHeld = false;
});
this._finalizationRegistry.register(value, undefined);
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;