@vitest/utils 4.1.10: setSafeTimers

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 @vitest/utils.setSafeTimers in pkg:npm/%40vitest/utils@4.1.10
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40vitest/utils@4.1.10
Demonstrate these symbols/APIs:
  - @vitest/utils.setSafeTimers
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.

{"case":{"caseId":"case:sha256:8e375186fe494f1f2893c412be0107447f09dc84b9b909fcbfc47f10e53f9e68","constraints":{"executionContext":"node"},"contract":["setSafeTimers captures current global timer implementations from globalThis so getSafeTimers returns them even when globalThis timers are mocked or replaced","setSafeTimers preserves setTimeout, setInterval, clearTimeout, clearInterval, setImmediate, clearImmediate, queueMicrotask, and process.nextTick","setSafeTimers updates the captured timers when invoked again after globalThis timer modifications","getSafeTimers returns functional timer functions captured by setSafeTimers that can execute callbacks asynchronously"],"goal":"verify @vitest/utils.setSafeTimers in pkg:npm/%40vitest/utils@4.1.10","kind":"HOW","packages":["pkg:npm/%40vitest/utils@4.1.10"],"schemaVersion":1,"symbols":["@vitest/utils.setSafeTimers"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40vitest/utils@4.1.10"],"schemaVersion":1,"subject":"pkg:npm/%40vitest/utils@4.1.10","symbols":["@vitest/utils.setSafeTimers"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-vitest-utils-safe-timers",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-vitest-utils-safe-timers",
      "version": "1.0.0",
      "dependencies": {
        "@vitest/utils": "4.1.10"
      }
    },
    "node_modules/@vitest/pretty-format": {
      "version": "4.1.10",
      "resolved": "https://registry.npmjs.org/@vitest/pretty-format/-/pretty-format-4.1.10.tgz",
      "integrity": "sha512-W1HsjSH4MXQ9YfmmhLAoIYf1HRfekQCGngeIgcei6MP5QQGWUe0gkopdZQaVCFO+JDJMrAJGwa5pRpNpvy4P8Q==",
      "license": "MIT",
      "dependencies": {
        "tinyrainbow": "^3.1.0"
      },
      "funding": {
        "url": "https://opencollective.com/vitest"
      }
    },
    "node_modules/@vitest/utils": {
      "version": "4.1.10",
      "resolved": "https://registry.npmjs.org/@vitest/utils/-/utils-4.1.10.tgz",
      "integrity": "sha512-fy9am/HWxbaGt/Sawrp90vt6Y6jQwf1RX77cz3uwoJwJVMli/e1IEwRPnMNJ7vKfPTwo0diXifkpPvwH9v7nGA==",
      "license": "MIT",
      "dependencies": {
        "@vitest/pretty-format": "4.1.10",
        "convert-source-map": "^2.0.0",
        "tinyrainbow": "^3.1.0"
      },
      "funding": {
        "url": "https://opencollective.com/vitest"
      }
    },
    "node_modules/convert-source-map": {
      "version": "2.0.0",
      "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-2.0.0.tgz",
      "integrity": "sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==",
      "license": "MIT"
    },
    "node_modules/tinyrainbow": {
      "version": "3.1.1",
      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.1.1.tgz",
      "integrity": "sha512-yau8yJdTt989Mm0Bd/236QnzEiPf2xLLTqUZRUJOo/3CB078LSwzei343DgtJVmfJKJE3TMINY1u42SQsP6mXw==",
      "license": "MIT",
      "engines": {
        "node": ">=14.0.0"
      }
    }
  }
}

{
  "name": "sample-vitest-utils-safe-timers",
  "version": "1.0.0",
  "private": true,
  "description": "verify @vitest/utils.setSafeTimers in pkg:npm/@vitest/utils@4.1.10",
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@vitest/utils": "4.1.10"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @vitest/utils.setSafeTimers in pkg:npm/%40vitest/utils@4.1.10",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40vitest/utils@4.1.10"
  ],
  "symbols": [
    "@vitest/utils.setSafeTimers"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import assert from 'node:assert/strict';
import { setSafeTimers, getSafeTimers } from '@vitest/utils/timers';

// 1. setSafeTimers preserves setTimeout, setInterval, clearTimeout, clearInterval, setImmediate, clearImmediate, queueMicrotask, and process.nextTick
const initialTimeout = globalThis.setTimeout;
const initialInterval = globalThis.setInterval;
const initialClearTimeout = globalThis.clearTimeout;
const initialClearInterval = globalThis.clearInterval;
const initialSetImmediate = globalThis.setImmediate;
const initialClearImmediate = globalThis.clearImmediate;
const initialQueueMicrotask = globalThis.queueMicrotask;
const initialNextTick = globalThis.process.nextTick;

setSafeTimers();
const captured = getSafeTimers();

assert.strictEqual(captured.setTimeout, initialTimeout);
assert.strictEqual(captured.setInterval, initialInterval);
assert.strictEqual(captured.clearTimeout, initialClearTimeout);
assert.strictEqual(captured.clearInterval, initialClearInterval);
assert.strictEqual(captured.setImmediate, initialSetImmediate);
assert.strictEqual(captured.clearImmediate, initialClearImmediate);
assert.strictEqual(captured.queueMicrotask, initialQueueMicrotask);
assert.strictEqual(captured.nextTick, initialNextTick);

// 2. setSafeTimers captures current global timer implementations from globalThis so getSafeTimers returns them even when globalThis timers are mocked or replaced
let mockInvoked = false;
globalThis.setTimeout = function mockedTimeout(callback, ms) {
  mockInvoked = true;
  return 777;
};

const safeAfterMock = getSafeTimers();
assert.strictEqual(safeAfterMock.setTimeout, initialTimeout);
assert.notStrictEqual(globalThis.setTimeout, initialTimeout);

// 3. setSafeTimers updates the captured timers when invoked again after globalThis timer modifications
const customTimeout = function customFn() {};
globalThis.setTimeout = customTimeout;
setSafeTimers();
assert.strictEqual(getSafeTimers().setTimeout, customTimeout);

// Restore global timer for functional validation
globalThis.setTimeout = initialTimeout;
setSafeTimers();

// 4. getSafeTimers returns functional timer functions captured by setSafeTimers that can execute callbacks asynchronously
let timerCompleted = false;
await new Promise((resolve) => {
  getSafeTimers().setTimeout(() => {
    timerCompleted = true;
    resolve();
  }, 10);
});
assert.strictEqual(timerCompleted, true);

let microtaskCompleted = false;
await new Promise((resolve) => {
  getSafeTimers().queueMicrotask(() => {
    microtaskCompleted = true;
    resolve();
  });
});
assert.strictEqual(microtaskCompleted, true);

console.log('Contract verified successfully.');