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サンプル

@jest/fake-timers 29.7.0: ModernFakeTimers, LegacyFakeTimers

検証済みサンプル — npm @jest/fake-timers 29.7.0: ModernFakeTimers, LegacyFakeTimers. node 22 · linux alpine/x64 · docker で contract を実行し、成功しました.

sha256:f3a9f946a4a29a2eac730a1e515046fa2eb34a226bc6d89d8cd2386cfc306339

このネットワークが提供するのは一つだけです。ビルドされるサンプル。サンドボックスで実行し、署名済みの受領証を保管します。等級はつけず、何も保証しません — 同じコードがあなたの環境でビルドされるかは測定していません。 合格した契約受領証を提出した異なる署名鍵の数です。1 なら作者だけ、2 以上なら他の誰かもビルドしています。鍵は自己生成で背後に登録された身元がないため、数えているのは人ではなく鍵です。 MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

証拠の基準
署名済みコントラクト合格
検証レシート
1
ビルドした署名鍵
1
宣言された環境 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

検証実行環境

環境 コントラクト ステージ 実行日
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-28

ケース

HOW
ゴール
verify pkg:npm/%40jest/fake-timers@29.7.0
パッケージ
シンボル
  • ModernFakeTimers
  • LegacyFakeTimers
環境
node 22.23.2
作成日
2026-08-28T03:09:44Z

コントラクト

  1. ModernFakeTimers installs fake timer mocks with useFakeTimers and restores original implementations on useRealTimers
  2. advanceTimersByTime advances virtual clock and executes scheduled timers synchronously
  3. advanceTimersByTimeAsync advances virtual clock asynchronously and resolves promises
  4. advanceTimersToNextTimer and advanceTimersToNextTimerAsync progress virtual time to the next pending timer
  5. runAllTimers and runAllTimersAsync execute all queued and recursively scheduled timers
  6. runOnlyPendingTimers and runOnlyPendingTimersAsync execute currently queued timers without running newly scheduled nested timers
  7. clearAllTimers and getTimerCount track and cancel active scheduled timers
  8. setSystemTime, getRealSystemTime, now, and reset manage and simulate system timestamps
  9. LegacyFakeTimers installs timer mocks, manages clock advancement, and executes runWithRealTimers callback
  10. withFakeTimers and withFakeTimersAsync helpers safely execute scoped synchronous and asynchronous callbacks

ファイル

  • PROMPT.md
  • csx.json
  • index.js
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.js

ソースアーティファクトをダウンロード (tar.gz)

ソース

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:npm/%40jest/fake-timers@29.7.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40jest/fake-timers@29.7.0
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:10661d99357f799bcaf336b869eb88bb840578a2515bdbcb98d20acdf2b3f28f","constraints":{"executionContext":"node"},"contract":["ModernFakeTimers installs fake timer mocks with useFakeTimers and restores original implementations on useRealTimers","advanceTimersByTime advances virtual clock and executes scheduled timers synchronously","advanceTimersByTimeAsync advances virtual clock asynchronously and resolves promises","advanceTimersToNextTimer and advanceTimersToNextTimerAsync progress virtual time to the next pending timer","runAllTimers and runAllTimersAsync execute all queued and recursively scheduled timers","runOnlyPendingTimers and runOnlyPendingTimersAsync execute currently queued timers without running newly scheduled nested timers","clearAllTimers and getTimerCount track and cancel active scheduled timers","setSystemTime, getRealSystemTime, now, and reset manage and simulate system timestamps","LegacyFakeTimers installs timer mocks, manages clock advancement, and executes runWithRealTimers callback","withFakeTimers and withFakeTimersAsync helpers safely execute scoped synchronous and asynchronous callbacks"],"goal":"verify pkg:npm/%40jest/fake-timers@29.7.0","kind":"HOW","packages":["pkg:npm/%40jest/fake-timers@29.7.0"],"schemaVersion":1,"symbols":["ModernFakeTimers","LegacyFakeTimers"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40jest/fake-timers@29.7.0"],"schemaVersion":1,"subject":"pkg:npm/%40jest/fake-timers@29.7.0","symbols":["ModernFakeTimers","LegacyFakeTimers"],"verifierAdapter":"node-typescript@1"}
index.js
'use strict';

const { ModernFakeTimers, LegacyFakeTimers } = require('@jest/fake-timers');

/**
 * Creates and configures a ModernFakeTimers instance.
 * @param {Object} [options]
 * @param {Object} [options.global] - Target global object (defaults to globalThis)
 * @param {Object} [options.config] - Jest project configuration
 * @returns {ModernFakeTimers}
 */
function createModernFakeTimers(options = {}) {
  const {
    global = globalThis,
    config = { rootDir: process.cwd() }
  } = options;
  return new ModernFakeTimers({ global, config });
}

/**
 * Creates and configures a LegacyFakeTimers instance with a mock environment.
 * @param {Object} [options]
 * @param {Object} [options.global] - Custom global object to mock
 * @param {Object} [options.config] - Stack trace configuration
 * @param {Object} [options.timerConfig] - Timer ref/id mappings
 * @param {Object} [options.moduleMocker] - Module mocker instance
 * @param {number} [options.maxLoops] - Maximum execution loops
 * @returns {{ timers: LegacyFakeTimers, global: Object }}
 */
function createLegacyFakeTimers(options = {}) {
  const targetGlobal = {
    clearImmediate: globalThis.clearImmediate,
    clearInterval: globalThis.clearInterval,
    clearTimeout: globalThis.clearTimeout,
    setImmediate: globalThis.setImmediate,
    setInterval: globalThis.setInterval,
    setTimeout: globalThis.setTimeout,
    process: { nextTick: process.nextTick },
    console: console,
    ...(options.global || {})
  };

  const moduleMocker = options.moduleMocker || {
    fn: (impl) => {
      const mockFn = (...args) => (impl ? impl(...args) : undefined);
      return mockFn;
    }
  };

  const timerConfig = options.timerConfig || {
    idToRef: (id) => id,
    refToId: (ref) => ref
  };

  const config = options.config || { rootDir: process.cwd() };

  const timers = new LegacyFakeTimers({
    global: targetGlobal,
    moduleMocker,
    timerConfig,
    config,
    maxLoops: options.maxLoops
  });

  return { timers, global: targetGlobal };
}

/**
 * Executes a callback within a scoped ModernFakeTimers context and ensures clean restoration.
 * @param {Function} callback - Function receiving fake timers instance
 * @param {Object} [config] - Fake timers configuration options
 * @returns {*} Result of the callback
 */
function withFakeTimers(callback, config = {}) {
  const fakeTimers = createModernFakeTimers();
  fakeTimers.useFakeTimers(config);
  try {
    return callback(fakeTimers);
  } finally {
    fakeTimers.useRealTimers();
    fakeTimers.dispose();
  }
}

/**
 * Executes an async callback within a scoped ModernFakeTimers context and ensures clean restoration.
 * @param {Function} callback - Async function receiving fake timers instance
 * @param {Object} [config] - Fake timers configuration options
 * @returns {Promise<*>} Result of the async callback
 */
async function withFakeTimersAsync(callback, config = {}) {
  const fakeTimers = createModernFakeTimers();
  fakeTimers.useFakeTimers(config);
  try {
    return await callback(fakeTimers);
  } finally {
    fakeTimers.useRealTimers();
    fakeTimers.dispose();
  }
}

module.exports = {
  ModernFakeTimers,
  LegacyFakeTimers,
  createModernFakeTimers,
  createLegacyFakeTimers,
  withFakeTimers,
  withFakeTimersAsync
};
package-lock.json
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}
package.json
{
  "name": "sample-jest-fake-timers",
  "version": "1.0.0",
  "private": true,
  "description": "verify pkg:npm/%40jest/fake-timers@29.7.0",
  "main": "index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@jest/fake-timers": "29.7.0"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40jest/fake-timers@29.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40jest/fake-timers@29.7.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.js
'use strict';

const assert = require('assert');
const {
  ModernFakeTimers,
  LegacyFakeTimers,
  createModernFakeTimers,
  createLegacyFakeTimers,
  withFakeTimers,
  withFakeTimersAsync
} = require('../index.js');

async function runContractTests() {
  // 1. ModernFakeTimers installs fake timer mocks with useFakeTimers and restores original implementations on useRealTimers
  {
    const originalSetTimeout = globalThis.setTimeout;
    const originalClearTimeout = globalThis.clearTimeout;
    const originalDate = globalThis.Date;

    const fake = createModernFakeTimers();
    fake.useFakeTimers();

    assert.notStrictEqual(globalThis.setTimeout, originalSetTimeout);
    assert.notStrictEqual(globalThis.clearTimeout, originalClearTimeout);
    assert.notStrictEqual(globalThis.Date, originalDate);

    fake.useRealTimers();

    assert.strictEqual(globalThis.setTimeout, originalSetTimeout);
    assert.strictEqual(globalThis.clearTimeout, originalClearTimeout);
    assert.strictEqual(globalThis.Date, originalDate);
    fake.dispose();
  }

  // 2. advanceTimersByTime advances virtual clock and executes scheduled timers synchronously
  {
    const fake = createModernFakeTimers();
    fake.useFakeTimers();

    const log = [];
    globalThis.setTimeout(() => log.push('first'), 100);
    globalThis.setTimeout(() => log.push('second'), 300);
    globalThis.setInterval(() => log.push('interval'), 150);

    fake.advanceTimersByTime(100);
    assert.deepStrictEqual(log, ['first']);

    fake.advanceTimersByTime(100);
    assert.deepStrictEqual(log, ['first', 'interval']);

    fake.advanceTimersByTime(100);
    assert.deepStrictEqual(log, ['first', 'interval', 'second', 'interval']);

    fake.useRealTimers();
    fake.dispose();
  }

  // 3. advanceTimersByTimeAsync advances virtual clock asynchronously and resolves promises
  {
    const fake = createModernFakeTimers();
    fake.useFakeTimers();

    let resolved = false;
    const promise = new Promise((resolve) => {
      globalThis.setTimeout(() => {
        resolved = true;
        resolve('done');
      }, 500);
    });

    assert.strictEqual(resolved, false);
    await fake.advanceTimersByTimeAsync(500);
    const result = await promise;
    assert.strictEqual(resolved, true);
    assert.strictEqual(result, 'done');

    fake.useRealTimers();
    fake.dispose();
  }

  // 4. advanceTimersToNextTimer and advanceTimersToNextTimerAsync progress virtual time to the next pending timer
  {
    const fake = createModernFakeTimers();
    fake.useFakeTimers();

    const events = [];
    globalThis.setTimeout(() => events.push('a'), 100);
    globalThis.setTimeout(() => events.push('b'), 250);
    globalThis.setTimeout(() => events.push('c'), 400);

    assert.strictEqual(fake.getTimerCount(), 3);
    fake.advanceTimersToNextTimer();
    assert.deepStrictEqual(events, ['a']);
    assert.strictEqual(fake.getTimerCount(), 2);

    await fake.advanceTimersToNextTimerAsync(2);
    assert.deepStrictEqual(events, ['a', 'b', 'c']);
    assert.strictEqual(fake.getTimerCount(), 0);

    fake.useRealTimers();
    fake.dispose();
  }

  // 5. runAllTimers and runAllTimersAsync execute all queued and recursively scheduled timers
  {
    const fake = createModernFakeTimers();
    fake.useFakeTimers();

    const nestedOrder = [];
    globalThis.setTimeout(() => {
      nestedOrder.push('level-1');
      globalThis.setTimeout(() => {
        nestedOrder.push('level-2');
        globalThis.setTimeout(() => {
          nestedOrder.push('level-3');
        }, 50);
      }, 50);
    }, 50);

    fake.runAllTimers();
    assert.deepStrictEqual(nestedOrder, ['level-1', 'level-2', 'level-3']);
    assert.strictEqual(fake.getTimerCount(), 0);

    const asyncOrder = [];
    globalThis.setTimeout(() => {
      asyncOrder.push('async-1');
      globalThis.setTimeout(() => {
        asyncOrder.push('async-2');
      }, 20);
    }, 20);

    await fake.runAllTimersAsync();
    assert.deepStrictEqual(asyncOrder, ['async-1', 'async-2']);
    assert.strictEqual(fake.getTimerCount(), 0);

    fake.useRealTimers();
    fake.dispose();
  }

  // 6. runOnlyPendingTimers and runOnlyPendingTimersAsync execute currently queued timers without running newly scheduled nested timers
  {
    const fake = createModernFakeTimers();
    fake.useFakeTimers();

    const pendingLog = [];
    globalThis.setTimeout(() => {
      pendingLog.push('parent-1');
      globalThis.setTimeout(() => pendingLog.push('child-1'), 100);
    }, 50);
    globalThis.setTimeout(() => {
      pendingLog.push('parent-2');
    }, 80);

    fake.runOnlyPendingTimers();
    assert.deepStrictEqual(pendingLog, ['parent-1', 'parent-2']);
    assert.strictEqual(fake.getTimerCount(), 1);

    await fake.runOnlyPendingTimersAsync();
    assert.deepStrictEqual(pendingLog, ['parent-1', 'parent-2', 'child-1']);
    assert.strictEqual(fake.getTimerCount(), 0);

    fake.useRealTimers();
    fake.dispose();
  }

  // 7. clearAllTimers and getTimerCount track and cancel active scheduled timers
  {
    const fake = createModernFakeTimers();
    fake.useFakeTimers();

    globalThis.setTimeout(() => {}, 100);
    globalThis.setTimeout(() => {}, 200);
    globalThis.setInterval(() => {}, 300);

    assert.strictEqual(fake.getTimerCount(), 3);
    fake.clearAllTimers();
    assert.strictEqual(fake.getTimerCount(), 0);

    fake.useRealTimers();
    fake.dispose();
  }

  // 8. setSystemTime, getRealSystemTime, now, and reset manage and simulate system timestamps
  {
    const fake = createModernFakeTimers();
    fake.useFakeTimers();

    const targetDate = new Date('2026-08-28T00:00:00.000Z');
    fake.setSystemTime(targetDate);

    assert.strictEqual(fake.now(), targetDate.getTime());
    assert.strictEqual(globalThis.Date.now(), targetDate.getTime());

    const realTime = fake.getRealSystemTime();
    assert.strictEqual(typeof realTime, 'number');
    assert.ok(realTime > 0);

    fake.reset();
    fake.useRealTimers();
    fake.dispose();
  }

  // 9. LegacyFakeTimers installs timer mocks, manages clock advancement, and executes runWithRealTimers callback
  {
    const { timers, global } = createLegacyFakeTimers();
    timers.useFakeTimers();

    let legacyCalled = false;
    global.setTimeout(() => {
      legacyCalled = true;
    }, 100);

    assert.strictEqual(timers.getTimerCount(), 1);
    timers.advanceTimersByTime(100);
    assert.strictEqual(legacyCalled, true);
    assert.strictEqual(timers.getTimerCount(), 0);

    let realTimerExecuted = false;
    timers.runWithRealTimers(() => {
      realTimerExecuted = true;
    });
    assert.strictEqual(realTimerExecuted, true);

    timers.useRealTimers();
    timers.dispose();
  }

  // 10. withFakeTimers and withFakeTimersAsync helpers safely execute scoped synchronous and asynchronous callbacks
  {
    const originalSetTimeout = globalThis.setTimeout;

    const syncResult = withFakeTimers((fake) => {
      assert.notStrictEqual(globalThis.setTimeout, originalSetTimeout);
      let executed = false;
      globalThis.setTimeout(() => {
        executed = true;
      }, 50);
      fake.runAllTimers();
      assert.strictEqual(executed, true);
      return 42;
    });
    assert.strictEqual(syncResult, 42);
    assert.strictEqual(globalThis.setTimeout, originalSetTimeout);

    const asyncResult = await withFakeTimersAsync(async (fake) => {
      assert.notStrictEqual(globalThis.setTimeout, originalSetTimeout);
      let executed = false;
      globalThis.setTimeout(() => {
        executed = true;
      }, 100);
      await fake.runAllTimersAsync();
      assert.strictEqual(executed, true);
      return 84;
    });
    assert.strictEqual(asyncResult, 84);
    assert.strictEqual(globalThis.setTimeout, originalSetTimeout);
  }

  console.log('All @jest/fake-timers contract assertions passed successfully.');
}

runContractTests().catch((err) => {
  console.error('Contract test failure:', err);
  process.exit(1);
});

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