CodeSampleX

Ejemplo

@jest/fake-timers 29.7.0: LegacyFakeTimers

Muestra verificada para npm @jest/fake-timers 29.7.0: LegacyFakeTimers. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó.

sha256:c6a1af5594858c37f532883ff6636bbc0a1d78dad55a7b2a768c7772880b60f7

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
1
Claves de firma que lo compilaron
1
Entorno declarado node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
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…		 2026-08-26

Caso

HOW
Objetivo
verify LegacyFakeTimers in pkg:npm/%40jest/fake-timers@29.7.0
Paquetes
Símbolos
  • LegacyFakeTimers
Entorno
node 22.23.2
Creado
2026-08-26T04:22:58Z

Contrato

  1. LegacyFakeTimers installs fake timer mocks onto the target global object with useFakeTimers
  2. LegacyFakeTimers tracks and reports pending timer counts via getTimerCount
  3. LegacyFakeTimers advances virtual time and triggers timer callbacks via advanceTimersByTime
  4. LegacyFakeTimers advances virtual clock to subsequent timer expiries with advanceTimersToNextTimer
  5. LegacyFakeTimers executes all queued timers, ticks, and immediates with runAllTimers
  6. LegacyFakeTimers executes only currently scheduled timers with runOnlyPendingTimers
  7. LegacyFakeTimers processes queued process.nextTick and setImmediate callbacks with runAllTicks and runAllImmediates
  8. LegacyFakeTimers cancels pending timers and resets internal clock with clearAllTimers and reset
  9. LegacyFakeTimers temporarily executes synchronous callback with real timers using runWithRealTimers
  10. LegacyFakeTimers cleans up timers and marks instance disposed with dispose and restores original functions with useRealTimers

Archivos

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

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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 LegacyFakeTimers in 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
Demonstrate these symbols/APIs:
  - LegacyFakeTimers
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:eee57062291eb9590558a737e1f0763bb97bd150ade748758bc48ac095fec582","constraints":{"executionContext":"node"},"contract":["LegacyFakeTimers installs fake timer mocks onto the target global object with useFakeTimers","LegacyFakeTimers tracks and reports pending timer counts via getTimerCount","LegacyFakeTimers advances virtual time and triggers timer callbacks via advanceTimersByTime","LegacyFakeTimers advances virtual clock to subsequent timer expiries with advanceTimersToNextTimer","LegacyFakeTimers executes all queued timers, ticks, and immediates with runAllTimers","LegacyFakeTimers executes only currently scheduled timers with runOnlyPendingTimers","LegacyFakeTimers processes queued process.nextTick and setImmediate callbacks with runAllTicks and runAllImmediates","LegacyFakeTimers cancels pending timers and resets internal clock with clearAllTimers and reset","LegacyFakeTimers temporarily executes synchronous callback with real timers using runWithRealTimers","LegacyFakeTimers cleans up timers and marks instance disposed with dispose and restores original functions with useRealTimers"],"goal":"verify LegacyFakeTimers in pkg:npm/%40jest/fake-timers@29.7.0","kind":"HOW","packages":["pkg:npm/%40jest/fake-timers@29.7.0"],"schemaVersion":1,"symbols":["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":["LegacyFakeTimers"],"verifierAdapter":"node-typescript@1"}
index.js
'use strict';

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

/**
 * Helper to create and initialize a LegacyFakeTimers instance with a mock environment.
 */
function createLegacyFakeTimers(customGlobal = {}, customOptions = {}) {
  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,
    ...customGlobal
  };

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

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

  const config = { rootDir: '/' };

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

  return { timers, global: targetGlobal };
}

module.exports = {
  LegacyFakeTimers,
  ModernFakeTimers,
  createLegacyFakeTimers
};
package-lock.json
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  "lockfileVersion": 3,
  "requires": true,
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    "": {
      "name": "sample-jest-fake-timers-legacy",
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package.json
{
  "name": "sample-jest-fake-timers-legacy",
  "version": "1.0.0",
  "private": true,
  "description": "verify LegacyFakeTimers in 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 LegacyFakeTimers in pkg:npm/%40jest/fake-timers@29.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40jest/fake-timers@29.7.0"
  ],
  "symbols": [
    "LegacyFakeTimers"
  ],
  "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 { LegacyFakeTimers, createLegacyFakeTimers } = require('../index.js');

function testUseFakeTimersAndMockReplacement() {
  const { timers, global } = createLegacyFakeTimers();
  const originalSetTimeout = global.setTimeout;
  const originalClearTimeout = global.clearTimeout;

  timers.useFakeTimers();

  assert.notStrictEqual(global.setTimeout, originalSetTimeout);
  assert.notStrictEqual(global.clearTimeout, originalClearTimeout);
  assert.strictEqual(typeof global.setTimeout, 'function');
  assert.strictEqual(typeof global.setInterval, 'function');
  assert.strictEqual(typeof global.setImmediate, 'function');
  assert.strictEqual(typeof global.clearImmediate, 'function');
  assert.strictEqual(typeof global.clearInterval, 'function');
  assert.strictEqual(typeof global.clearTimeout, 'function');
  assert.strictEqual(typeof global.process.nextTick, 'function');

  timers.useRealTimers();
  assert.strictEqual(global.setTimeout, originalSetTimeout);
  assert.strictEqual(global.clearTimeout, originalClearTimeout);
}

function testTimerCountAndVirtualClock() {
  const { timers, global } = createLegacyFakeTimers();
  timers.useFakeTimers();

  assert.strictEqual(timers.now(), 0);
  assert.strictEqual(timers.getTimerCount(), 0);

  global.setTimeout(() => {}, 100);
  global.setInterval(() => {}, 200);
  global.setImmediate(() => {});
  global.process.nextTick(() => {});

  assert.strictEqual(timers.getTimerCount(), 4);

  timers.useRealTimers();
}

function testAdvanceTimersByTime() {
  const { timers, global } = createLegacyFakeTimers();
  timers.useFakeTimers();

  const executionLog = [];

  global.setTimeout((arg) => {
    executionLog.push(`timeout-100:${arg}`);
  }, 100, 'first');

  global.setTimeout((arg) => {
    executionLog.push(`timeout-250:${arg}`);
  }, 250, 'second');

  global.setInterval(() => {
    executionLog.push('interval-100');
  }, 100);

  timers.advanceTimersByTime(150);
  assert.strictEqual(timers.now(), 150);
  assert.deepStrictEqual(executionLog, ['timeout-100:first', 'interval-100']);

  timers.advanceTimersByTime(150);
  assert.strictEqual(timers.now(), 300);
  assert.deepStrictEqual(executionLog, [
    'timeout-100:first',
    'interval-100',
    'interval-100',
    'timeout-250:second',
    'interval-100'
  ]);

  timers.useRealTimers();
}

function testAdvanceTimersToNextTimer() {
  const { timers, global } = createLegacyFakeTimers();
  timers.useFakeTimers();

  const executed = [];
  global.setTimeout(() => executed.push(50), 50);
  global.setTimeout(() => executed.push(120), 120);
  global.setTimeout(() => executed.push(300), 300);

  timers.advanceTimersToNextTimer(1);
  assert.strictEqual(timers.now(), 50);
  assert.deepStrictEqual(executed, [50]);

  timers.advanceTimersToNextTimer(2);
  assert.strictEqual(timers.now(), 300);
  assert.deepStrictEqual(executed, [50, 120, 300]);

  timers.useRealTimers();
}

function testRunAllTimers() {
  const { timers, global } = createLegacyFakeTimers();
  timers.useFakeTimers();

  const results = [];
  global.setTimeout(() => {
    results.push('t1');
    global.setTimeout(() => {
      results.push('t2');
    }, 50);
  }, 50);

  global.setImmediate(() => {
    results.push('imm1');
  });

  global.process.nextTick(() => {
    results.push('tick1');
  });

  timers.runAllTimers();
  assert.deepStrictEqual(results, ['tick1', 'imm1', 't1', 't2']);
  assert.strictEqual(timers.getTimerCount(), 0);

  timers.useRealTimers();
}

function testRunOnlyPendingTimers() {
  const { timers, global } = createLegacyFakeTimers();
  timers.useFakeTimers();

  const executed = [];
  global.setTimeout(() => {
    executed.push('pending1');
    global.setTimeout(() => {
      executed.push('nested1');
    }, 10);
  }, 100);

  global.setTimeout(() => {
    executed.push('pending2');
  }, 200);

  timers.runOnlyPendingTimers();
  assert.deepStrictEqual(executed, ['pending1', 'pending2']);
  assert.strictEqual(timers.getTimerCount(), 1);

  timers.advanceTimersByTime(10);
  assert.deepStrictEqual(executed, ['pending1', 'pending2', 'nested1']);
  assert.strictEqual(timers.getTimerCount(), 0);

  timers.useRealTimers();
}

function testRunAllTicksAndImmediates() {
  const { timers, global } = createLegacyFakeTimers();
  timers.useFakeTimers();

  const tickResults = [];
  const immediateResults = [];

  global.process.nextTick(() => tickResults.push('tick-a'));
  global.process.nextTick(() => tickResults.push('tick-b'));
  global.setImmediate(() => immediateResults.push('imm-a'));
  global.setImmediate(() => immediateResults.push('imm-b'));

  assert.strictEqual(timers.getTimerCount(), 4);

  timers.runAllTicks();
  assert.deepStrictEqual(tickResults, ['tick-a', 'tick-b']);
  assert.strictEqual(immediateResults.length, 0);

  timers.runAllImmediates();
  assert.deepStrictEqual(immediateResults, ['imm-a', 'imm-b']);
  assert.strictEqual(timers.getTimerCount(), 0);

  timers.useRealTimers();
}

function testClearAllTimersAndReset() {
  const { timers, global } = createLegacyFakeTimers();
  timers.useFakeTimers();

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

  global.setImmediate(() => {
    executed = true;
  });

  assert.strictEqual(timers.getTimerCount(), 2);
  timers.clearAllTimers();
  assert.strictEqual(timers.getTimerCount(), 0);

  timers.advanceTimersByTime(500);
  assert.strictEqual(executed, false);

  global.setTimeout(() => {}, 200);
  timers.advanceTimersByTime(100);
  assert.strictEqual(timers.now(), 600);

  timers.reset();
  assert.strictEqual(timers.now(), 0);
  assert.strictEqual(timers.getTimerCount(), 0);

  timers.useRealTimers();
}

function testRunWithRealTimers() {
  const { timers, global } = createLegacyFakeTimers();
  timers.useFakeTimers();

  const fakeSetTimeout = global.setTimeout;
  let executedSynchronously = false;

  timers.runWithRealTimers(() => {
    assert.notStrictEqual(global.setTimeout, fakeSetTimeout);
    executedSynchronously = true;
  });

  assert.strictEqual(executedSynchronously, true);
  assert.strictEqual(global.setTimeout, fakeSetTimeout);

  timers.useRealTimers();
}

function testDispose() {
  const { timers, global } = createLegacyFakeTimers();
  timers.useFakeTimers();

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

  timers.dispose();
  assert.strictEqual(timers.getTimerCount(), 0);

  // Calling timer APIs after dispose should return null / noop
  const timerHandle = global.setTimeout(() => {}, 100);
  assert.strictEqual(timerHandle, null);

  timers.useRealTimers();
}

function runAll() {
  testUseFakeTimersAndMockReplacement();
  testTimerCountAndVirtualClock();
  testAdvanceTimersByTime();
  testAdvanceTimersToNextTimer();
  testRunAllTimers();
  testRunOnlyPendingTimers();
  testRunAllTicksAndImmediates();
  testClearAllTimersAndReset();
  testRunWithRealTimers();
  testDispose();

  console.log('All LegacyFakeTimers contract assertions passed successfully.');
}

runAll();

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