CodeSampleX

Ejemplo

jest-watcher 29.7.0: BaseWatchPlugin

Muestra verificada para npm jest-watcher 29.7.0: BaseWatchPlugin. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó.

sha256:c91cb2afdf95e6d577621ffc93c32f82029c4e3c65d6ddafc2672e8a13b3e7d3

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 linux 24 · ubuntu · glibc 2.39 x64 npm

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
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

Caso

HOW
Objetivo
verify jest-watcher.BaseWatchPlugin in pkg:npm/jest-watcher@29.7.0
Paquetes
Símbolos
  • jest-watcher.BaseWatchPlugin
Creado
2026-09-05T18:09:55Z

Contrato

  1. BaseWatchPlugin constructor initializes stdin and stdout streams
  2. BaseWatchPlugin default getUsageInfo returns null and run resolves undefined
  3. BaseWatchPlugin default apply and onKey methods execute safely as no-ops
  4. Custom watch plugin extending BaseWatchPlugin overrides getUsageInfo to expose key and prompt configuration
  5. Custom watch plugin extending BaseWatchPlugin overrides apply to subscribe to test suite filtering hooks
  6. Custom watch plugin extending BaseWatchPlugin overrides onKey to handle terminal keypress input
  7. Custom watch plugin extending BaseWatchPlugin overrides run to execute config updates and request test rerun

Archivos

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

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 jest-watcher.BaseWatchPlugin 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.BaseWatchPlugin

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:sha256:51671959835431bd2710226905a7f03b037999b7049d12da4959f640697e625a","contract":["BaseWatchPlugin constructor initializes stdin and stdout streams","BaseWatchPlugin default getUsageInfo returns null and run resolves undefined","BaseWatchPlugin default apply and onKey methods execute safely as no-ops","Custom watch plugin extending BaseWatchPlugin overrides getUsageInfo to expose key and prompt configuration","Custom watch plugin extending BaseWatchPlugin overrides apply to subscribe to test suite filtering hooks","Custom watch plugin extending BaseWatchPlugin overrides onKey to handle terminal keypress input","Custom watch plugin extending BaseWatchPlugin overrides run to execute config updates and request test rerun"],"goal":"verify jest-watcher.BaseWatchPlugin in pkg:npm/jest-watcher@29.7.0","kind":"HOW","packages":["pkg:npm/jest-watcher@29.7.0"],"schemaVersion":1,"symbols":["jest-watcher.BaseWatchPlugin"]},"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.BaseWatchPlugin"],"verifierAdapter":"node-typescript@1"}
index.mjs
import { BaseWatchPlugin, JestHook, KEYS } from 'jest-watcher';

export { BaseWatchPlugin, JestHook, KEYS };

export class CustomWatchPlugin extends BaseWatchPlugin {
  constructor(options = {}) {
    super(options);
    this._key = options.key || 'f';
    this._prompt = options.prompt || 'filter by pattern';
    this.filterPattern = null;
    this.applied = false;
  }

  apply(hooks) {
    this.applied = true;
    if (hooks && typeof hooks.shouldRunTestSuite === 'function') {
      hooks.shouldRunTestSuite((testSuite) => {
        if (!this.filterPattern) {
          return true;
        }
        return testSuite.testPath.includes(this.filterPattern);
      });
    }
  }

  getUsageInfo() {
    return {
      key: this._key,
      prompt: this._prompt,
    };
  }

  onKey(key) {
    if (key === KEYS.ESCAPE) {
      this.filterPattern = null;
    }
  }

  async run(globalConfig, updateConfigAndRun) {
    if (typeof updateConfigAndRun === 'function') {
      await updateConfigAndRun({
        testPathPattern: this.filterPattern || '',
      });
      return true;
    }
    return false;
  }
}
package-lock.json
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  "name": "sample-jest-watcher-base-watch-plugin",
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  "lockfileVersion": 3,
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    "": {
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      "license": "MIT",
      "dependencies": {
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package.json
{
  "name": "sample-jest-watcher-base-watch-plugin",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "jest-watcher": "29.7.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify jest-watcher.BaseWatchPlugin in pkg:npm/jest-watcher@29.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-watcher@29.7.0"
  ],
  "symbols": [
    "jest-watcher.BaseWatchPlugin"
  ]
}
test/contract.mjs
import assert from 'node:assert/strict';
import { BaseWatchPlugin, JestHook, KEYS } from 'jest-watcher';
import { CustomWatchPlugin } from '../index.mjs';

async function run() {
  // 1. BaseWatchPlugin constructor initializes stdin and stdout streams
  {
    const mockStdin = { isTTY: true };
    const mockStdout = { write: () => {} };
    const base = new BaseWatchPlugin({ stdin: mockStdin, stdout: mockStdout });
    assert.equal(base._stdin, mockStdin);
    assert.equal(base._stdout, mockStdout);
  }

  // 2. BaseWatchPlugin default getUsageInfo returns null and run resolves undefined
  {
    const mockStdin = {};
    const mockStdout = {};
    const base = new BaseWatchPlugin({ stdin: mockStdin, stdout: mockStdout });
    assert.equal(base.getUsageInfo({}), null);
    const runResult = await base.run({}, () => {});
    assert.equal(runResult, undefined);
  }

  // 3. BaseWatchPlugin default apply and onKey methods execute safely as no-ops
  {
    const mockStdin = {};
    const mockStdout = {};
    const base = new BaseWatchPlugin({ stdin: mockStdin, stdout: mockStdout });
    assert.doesNotThrow(() => base.apply({}));
    assert.doesNotThrow(() => base.onKey('x'));
  }

  // 4. Custom watch plugin extending BaseWatchPlugin overrides getUsageInfo to expose key and prompt configuration
  {
    const mockStdin = {};
    const mockStdout = {};
    const plugin = new CustomWatchPlugin({
      stdin: mockStdin,
      stdout: mockStdout,
      key: 'p',
      prompt: 'filter by test path pattern',
    });
    const usage = plugin.getUsageInfo({});
    assert.deepEqual(usage, {
      key: 'p',
      prompt: 'filter by test path pattern',
    });
  }

  // 5. Custom watch plugin extending BaseWatchPlugin overrides apply to subscribe to test suite filtering hooks
  {
    const mockStdin = {};
    const mockStdout = {};
    const plugin = new CustomWatchPlugin({ stdin: mockStdin, stdout: mockStdout });
    const hook = new JestHook();

    assert.equal(plugin.applied, false);
    plugin.apply(hook.getSubscriber());
    assert.equal(plugin.applied, true);
    assert.equal(hook.isUsed('shouldRunTestSuite'), true);

    const emitter = hook.getEmitter();
    const allowedSuite = await emitter.shouldRunTestSuite({ testPath: '/workspace/test/unit.test.js' });
    assert.equal(allowedSuite, true);

    plugin.filterPattern = 'component';
    const matchingSuite = await emitter.shouldRunTestSuite({ testPath: '/workspace/test/component.test.js' });
    assert.equal(matchingSuite, true);

    const nonMatchingSuite = await emitter.shouldRunTestSuite({ testPath: '/workspace/test/service.test.js' });
    assert.equal(nonMatchingSuite, false);
  }

  // 6. Custom watch plugin extending BaseWatchPlugin overrides onKey to handle terminal keypress input
  {
    const mockStdin = {};
    const mockStdout = {};
    const plugin = new CustomWatchPlugin({ stdin: mockStdin, stdout: mockStdout });
    const hook = new JestHook();
    plugin.apply(hook.getSubscriber());
    const emitter = hook.getEmitter();

    plugin.filterPattern = 'component';
    assert.equal(await emitter.shouldRunTestSuite({ testPath: '/workspace/test/service.test.js' }), false);

    plugin.onKey(KEYS.ESCAPE);
    assert.equal(plugin.filterPattern, null);
    assert.equal(await emitter.shouldRunTestSuite({ testPath: '/workspace/test/service.test.js' }), true);
  }

  // 7. Custom watch plugin extending BaseWatchPlugin overrides run to execute config updates and request test rerun
  {
    const mockStdin = {};
    const mockStdout = {};
    const plugin = new CustomWatchPlugin({ stdin: mockStdin, stdout: mockStdout });
    plugin.filterPattern = 'auth';

    let appliedConfig = null;
    const updateConfigAndRun = async (config) => {
      appliedConfig = config;
    };

    const rerun = await plugin.run({}, updateConfigAndRun);
    assert.equal(rerun, true);
    assert.deepEqual(appliedConfig, { testPathPattern: 'auth' });
  }

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

run();

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