CodeSampleX

Sample

jest-watcher 29.7.0: TestWatcher

Verified sample for npm jest-watcher 29.7.0: TestWatcher. The contract ran on node 22 · linux debian/x64 · docker and passed: TestWatcher class instantiates…

sha256:0e0d2b150b7b0e0f5a36660380fc143862f1c85ee5f1acde1548b6f71a54f006

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-05

Case

HOW
Goal
verify jest-watcher.TestWatcher in pkg:npm/jest-watcher@29.7.0
Packages
Symbols
  • jest-watcher.TestWatcher
Created
2026-09-05T21:42:42Z

Contract

  1. TestWatcher class instantiates with watch mode configuration flag
  2. TestWatcher initializes state with interrupted flag set to false
  3. TestWatcher isInterrupted reflects current interrupted state
  4. TestWatcher setState updates state properties asynchronously
  5. TestWatcher emits change event with updated state upon setState
  6. TestWatcher supports event listener registration and unsubscription inherited from Emittery

Files

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

Download the source artifact (tar.gz)

Source

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 jest-watcher.TestWatcher in pkg:npm/jest-watcher@29.7.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/jest-watcher@29.7.0
Demonstrate these symbols/APIs:
  - jest-watcher.TestWatcher

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:b8af8acec36fcec15b65df64a45d06ee701e648ba2f5341ead96c38b4e6b7c2c","contract":["TestWatcher class instantiates with watch mode configuration flag","TestWatcher initializes state with interrupted flag set to false","TestWatcher isInterrupted reflects current interrupted state","TestWatcher setState updates state properties asynchronously","TestWatcher emits change event with updated state upon setState","TestWatcher supports event listener registration and unsubscription inherited from Emittery"],"goal":"verify jest-watcher.TestWatcher in pkg:npm/jest-watcher@29.7.0","kind":"HOW","packages":["pkg:npm/jest-watcher@29.7.0"],"schemaVersion":1,"symbols":["jest-watcher.TestWatcher"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/jest-watcher@29.7.0"],"schemaVersion":1,"subject":"pkg:npm/jest-watcher@29.7.0","symbols":["jest-watcher.TestWatcher"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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  "name": "verify-jest-watcher",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
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    "": {
      "name": "verify-jest-watcher",
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      }
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      "dependencies": {
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package.json
{
  "name": "verify-jest-watcher",
  "version": "1.0.0",
  "type": "module",
  "description": "Verification sample for jest-watcher TestWatcher",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "jest-watcher": "29.7.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify jest-watcher.TestWatcher in pkg:npm/jest-watcher@29.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-watcher@29.7.0"
  ],
  "symbols": [
    "jest-watcher.TestWatcher"
  ]
}
src/index.mjs
import { TestWatcher } from 'jest-watcher';

/**
 * Creates and initializes a TestWatcher instance.
 * @param {object} options
 * @param {boolean} options.isWatchMode
 * @returns {TestWatcher}
 */
export function createTestWatcher({ isWatchMode = false } = {}) {
  return new TestWatcher({ isWatchMode });
}

export { TestWatcher };
export default TestWatcher;
test/contract.mjs
import assert from 'node:assert/strict';
import { TestWatcher, createTestWatcher } from '../src/index.mjs';

// 1. TestWatcher class instantiates with watch mode configuration flag
{
  const watcherWatch = new TestWatcher({ isWatchMode: true });
  assert.equal(watcherWatch.isWatchMode(), true);

  const watcherNonWatch = new TestWatcher({ isWatchMode: false });
  assert.equal(watcherNonWatch.isWatchMode(), false);

  const helperWatcher = createTestWatcher({ isWatchMode: true });
  assert.equal(helperWatcher.isWatchMode(), true);
}

// 2. TestWatcher initializes state with interrupted flag set to false
{
  const watcher = new TestWatcher({ isWatchMode: true });
  assert.deepEqual(watcher.state, { interrupted: false });
}

// 3. TestWatcher isInterrupted reflects current interrupted state
{
  const watcher = new TestWatcher({ isWatchMode: true });
  assert.equal(watcher.isInterrupted(), false);
}

// 4. TestWatcher setState updates state properties asynchronously
{
  const watcher = new TestWatcher({ isWatchMode: true });
  await watcher.setState({ interrupted: true });
  assert.equal(watcher.isInterrupted(), true);
  assert.equal(watcher.state.interrupted, true);

  await watcher.setState({ interrupted: false });
  assert.equal(watcher.isInterrupted(), false);
  assert.equal(watcher.state.interrupted, false);
}

// 5. TestWatcher emits change event with updated state upon setState
{
  const watcher = new TestWatcher({ isWatchMode: true });
  const events = [];

  watcher.on('change', (state) => {
    events.push({ ...state });
  });

  await watcher.setState({ interrupted: true });
  assert.equal(events.length, 1);
  assert.deepEqual(events[0], { interrupted: true });

  await watcher.setState({ interrupted: false });
  assert.equal(events.length, 2);
  assert.deepEqual(events[1], { interrupted: false });
}

// 6. TestWatcher supports event listener registration and unsubscription inherited from Emittery
{
  const watcher = new TestWatcher({ isWatchMode: true });
  let count = 0;
  const unsubscribe = watcher.on('change', () => {
    count++;
  });

  await watcher.setState({ interrupted: true });
  assert.equal(count, 1);

  unsubscribe();
  await watcher.setState({ interrupted: false });
  assert.equal(count, 1);
}

console.log('All jest-watcher.TestWatcher contract assertions passed.');

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