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: / var / canvas / node_modules / jest-leak-detector / build /
Filename : 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;