jest-watcher 29.7.0: BaseWatchPlugin

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.

{"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"}

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;
  }
}

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  "lockfileVersion": 3,
  "requires": true,
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    "": {
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{
  "name": "sample-jest-watcher-base-watch-plugin",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "jest-watcher": "29.7.0"
  }
}

{
  "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"
  ]
}

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();