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

@@ -0,0 +1,99 @@
+'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) Meta Platforms, Inc. and affiliates.
+ *
+ * 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;