nodejs/test/parallel/test-watch-file-shared-dependency.mjs

// Flags: --expose-internals
import * as common from '../common/index.mjs';
import { describe, it } from 'node:test';
import assert from 'node:assert';
import tmpdir from '../common/tmpdir.js';
import watcher from 'internal/watch_mode/files_watcher';
import { writeFileSync } from 'node:fs';

if (common.isIBMi)
  common.skip('IBMi does not support `fs.watch()`');

if (common.isAIX)
  common.skip('folder watch capability is limited in AIX.');

tmpdir.refresh();

const { FilesWatcher } = watcher;

tmpdir.refresh();

// Set up test files and dependencies
const fixtureContent = {
  'dependency.js': 'module.exports = {};',
  'test.js': 'require(\'./dependency.js\');',
  'test-2.js': 'require(\'./dependency.js\');',
};

const fixturePaths = Object.fromEntries(Object.keys(fixtureContent)
  .map((file) => [file, tmpdir.resolve(file)]));

Object.entries(fixtureContent)
  .forEach(([file, content]) => writeFileSync(fixturePaths[file], content));

describe('watch file with shared dependency', () => {
  it('should not remove shared dependencies when unfiltering an owner', () => {
    const controller = new AbortController();
    const watcher = new FilesWatcher({ signal: controller.signal, debounce: 200 });

    watcher.on('changed', ({ owners }) => {
      assert.strictEqual(owners.size, 2);
      assert.ok(owners.has(fixturePaths['test.js']));
      assert.ok(owners.has(fixturePaths['test-2.js']));
      controller.abort();
    });
    watcher.filterFile(fixturePaths['test.js']);
    watcher.filterFile(fixturePaths['test-2.js']);
    watcher.filterFile(fixturePaths['dependency.js'], fixturePaths['test.js']);
    watcher.filterFile(fixturePaths['dependency.js'], fixturePaths['test-2.js']);
    watcher.unfilterFilesOwnedBy([fixturePaths['test.js']]);
    watcher.filterFile(fixturePaths['test.js']);
    watcher.filterFile(fixturePaths['dependency.js'], fixturePaths['test.js']);
    writeFileSync(fixturePaths['dependency.js'], 'module.exports = { modified: true };');
  });
});