CodeSampleX

示例

@jest/fake-timers 30.4.1: ModernFakeTimers

已验证示例 — npm @jest/fake-timers 30.4.1: ModernFakeTimers. contract 在 node 22 · linux alpine/x64 · docker 上运行并通过： ModernFakeTimers instantiates with global…

sha256:fcc177f4281da0257a382c7daa84ed22f46032d7191ed917d3c515d7de48f569

本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。 提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。 MIT-0

执行证据

声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。

证据依据
签名契约通过
验证回执
1
构建过它的签名密钥
1
声明的环境 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

验证运行环境

环境 契约 阶段 运行日期
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…		 2026-08-27

案例

HOW
目标
verify pkg:npm/%40jest/fake-timers@30.4.1
包
符号
  • ModernFakeTimers
环境
node 22.23.2
创建时间
2026-08-27T22:44:04Z

契约

  1. ModernFakeTimers instantiates with global environment and intercepts timer functions upon useFakeTimers and restores original implementations on useRealTimers
  2. advanceTimersByTime advances virtual clock by milliseconds and fires scheduled timer callbacks synchronously
  3. advanceTimersByTimeAsync advances virtual clock asynchronously and resolves pending asynchronous timer callbacks
  4. advanceTimersToNextTimer and advanceTimersToNextTimerAsync progress virtual time directly to the earliest scheduled timer
  5. runAllTimers and runAllTimersAsync exhaustively 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, now, and reset manage and simulate current timestamp
  9. setTimerTickMode configures timer advance behavior
  10. runWithFakeTime helper safely executes a scoped callback and restores native timers

文件

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

下载源代码构件 (tar.gz)

源代码

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@30.4.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40jest/fake-timers@30.4.1
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:sha256:1b5f4b75f41921f3eb8d5250ef9cf0947a116bd9decc9562ffdebd0515f5cc2c","constraints":{"executionContext":"node"},"contract":["ModernFakeTimers instantiates with global environment and intercepts timer functions upon useFakeTimers and restores original implementations on useRealTimers","advanceTimersByTime advances virtual clock by milliseconds and fires scheduled timer callbacks synchronously","advanceTimersByTimeAsync advances virtual clock asynchronously and resolves pending asynchronous timer callbacks","advanceTimersToNextTimer and advanceTimersToNextTimerAsync progress virtual time directly to the earliest scheduled timer","runAllTimers and runAllTimersAsync exhaustively 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, now, and reset manage and simulate current timestamp","setTimerTickMode configures timer advance behavior","runWithFakeTime helper safely executes a scoped callback and restores native timers"],"goal":"verify pkg:npm/%40jest/fake-timers@30.4.1","kind":"HOW","packages":["pkg:npm/%40jest/fake-timers@30.4.1"],"schemaVersion":1,"symbols":["ModernFakeTimers"]},"contractCommand":["node","test/contract.mjs"],"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@30.4.1"],"schemaVersion":1,"subject":"pkg:npm/%40jest/fake-timers@30.4.1","symbols":["ModernFakeTimers"],"verifierAdapter":"node-typescript@1"}
index.mjs
import { ModernFakeTimers, LegacyFakeTimers } from '@jest/fake-timers';

export { ModernFakeTimers, LegacyFakeTimers };

export function createModernFakeTimers(options = {}) {
  const {
    global = globalThis,
    config = { rootDir: process.cwd() }
  } = options;
  return new ModernFakeTimers({ global, config });
}

export function runWithFakeTime(fn, options = {}) {
  const fakeTimers = createModernFakeTimers(options);
  fakeTimers.useFakeTimers();
  try {
    return fn(fakeTimers);
  } finally {
    fakeTimers.useRealTimers();
  }
}
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      "license": "MIT",
      "dependencies": {
        "@babel/helper-validator-identifier": "^7.29.7",
        "js-tokens": "^4.0.0",
        "picocolors": "^1.1.1"
      },
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package.json
{
  "name": "sample-jest-fake-timers",
  "version": "1.0.0",
  "description": "Clean-room verification sample for @jest/fake-timers",
  "type": "module",
  "main": "index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@jest/fake-timers": "30.4.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40jest/fake-timers@30.4.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40jest/fake-timers@30.4.1"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import { ModernFakeTimers, LegacyFakeTimers } from '@jest/fake-timers';
import { createModernFakeTimers, runWithFakeTime } from '../index.mjs';

// 1. ModernFakeTimers instantiates with global environment and intercepts timer functions upon useFakeTimers and restores original implementations on useRealTimers
{
  const originalSetTimeout = globalThis.setTimeout;
  const originalDate = globalThis.Date;
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  assert.notEqual(globalThis.setTimeout, originalSetTimeout);
  assert.notEqual(globalThis.Date, originalDate);
  fake.useRealTimers();
  assert.equal(globalThis.setTimeout, originalSetTimeout);
  assert.equal(globalThis.Date, originalDate);
}

// 2. advanceTimersByTime advances virtual clock by milliseconds and fires scheduled timer callbacks synchronously
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  const calls = [];
  setTimeout(() => { calls.push('a'); }, 250);
  setTimeout(() => { calls.push('b'); }, 500);

  fake.advanceTimersByTime(250);
  assert.deepEqual(calls, ['a']);

  fake.advanceTimersByTime(250);
  assert.deepEqual(calls, ['a', 'b']);
  fake.useRealTimers();
}

// 3. advanceTimersByTimeAsync advances virtual clock asynchronously and resolves pending asynchronous timer callbacks
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  let asyncFired = false;
  setTimeout(() => { asyncFired = true; }, 300);

  assert.equal(asyncFired, false);
  await fake.advanceTimersByTimeAsync(300);
  assert.equal(asyncFired, true);
  fake.useRealTimers();
}

// 4. advanceTimersToNextTimer and advanceTimersToNextTimerAsync progress virtual time directly to the earliest scheduled timer
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  const sequence = [];
  setTimeout(() => { sequence.push(1); }, 100);
  setTimeout(() => { sequence.push(2); }, 300);

  assert.equal(fake.getTimerCount(), 2);
  fake.advanceTimersToNextTimer();
  assert.deepEqual(sequence, [1]);
  assert.equal(fake.getTimerCount(), 1);

  await fake.advanceTimersToNextTimerAsync();
  assert.deepEqual(sequence, [1, 2]);
  assert.equal(fake.getTimerCount(), 0);
  fake.useRealTimers();
}

// 5. runAllTimers and runAllTimersAsync exhaustively execute all queued and recursively scheduled timers
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  const executionOrder = [];
  setTimeout(() => {
    executionOrder.push('parent');
    setTimeout(() => {
      executionOrder.push('child');
    }, 50);
  }, 50);

  fake.runAllTimers();
  assert.deepEqual(executionOrder, ['parent', 'child']);
  assert.equal(fake.getTimerCount(), 0);
  fake.useRealTimers();
}

// 6. runOnlyPendingTimers and runOnlyPendingTimersAsync execute currently queued timers without running newly scheduled nested timers
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  const results = [];
  setTimeout(() => {
    results.push('initial');
    setTimeout(() => {
      results.push('nested');
    }, 50);
  }, 50);

  fake.runOnlyPendingTimers();
  assert.deepEqual(results, ['initial']);
  assert.equal(fake.getTimerCount(), 1);

  fake.clearAllTimers();
  assert.equal(fake.getTimerCount(), 0);
  fake.useRealTimers();
}

// 7. clearAllTimers and getTimerCount track and cancel active scheduled timers
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  setTimeout(() => {}, 100);
  setTimeout(() => {}, 200);
  setInterval(() => {}, 300);

  assert.equal(fake.getTimerCount(), 3);
  fake.clearAllTimers();
  assert.equal(fake.getTimerCount(), 0);
  fake.useRealTimers();
}

// 8. setSystemTime, now, and reset manage and simulate current timestamp
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  const epochTime = new Date('2026-08-23T12:00:00.000Z').getTime();
  fake.setSystemTime(epochTime);

  assert.equal(fake.now(), epochTime);
  assert.equal(Date.now(), epochTime);

  fake.reset();
  assert.equal(fake.now(), epochTime);
  fake.useRealTimers();
}

// 9. setTimerTickMode configures timer advance behavior
{
  const fake = createModernFakeTimers();
  fake.useFakeTimers();
  fake.setTimerTickMode({ mode: 'manual' });
  let ticked = false;
  setTimeout(() => { ticked = true; }, 100);
  fake.advanceTimersByTime(100);
  assert.equal(ticked, true);
  fake.useRealTimers();
}

// 10. runWithFakeTime helper safely executes a scoped callback and restores native timers
{
  const originalSetTimeout = globalThis.setTimeout;
  let executed = false;
  runWithFakeTime(fakeTimers => {
    assert.notEqual(globalThis.setTimeout, originalSetTimeout);
    setTimeout(() => { executed = true; }, 100);
    fakeTimers.runAllTimers();
    assert.equal(executed, true);
  });
  assert.equal(globalThis.setTimeout, originalSetTimeout);
}

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

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