Genarrative/scripts/pre-commit-format.test.mjs

import assert from 'node:assert/strict';
import { execFileSync, spawnSync } from 'node:child_process';
import { mkdtempSync, readFileSync, rmSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { delimiter, dirname, join, resolve } from 'node:path';
import { test } from 'node:test';
import { fileURLToPath } from 'node:url';

const repoRoot = resolve(dirname(fileURLToPath(import.meta.url)), '..');
const packageJson = JSON.parse(
  readFileSync(join(repoRoot, 'package.json'), 'utf8'),
);

test('pre-commit hook 仅格式化暂存的 TypeScript 快照', () => {
  assert.equal(packageJson.scripts.prepare, 'husky');
  assert.equal(packageJson.scripts['format:staged'], 'lint-staged');
  assert.deepEqual(packageJson['lint-staged'], {
    '*.{ts,tsx}': 'prettier --write',
  });
  assert.equal(
    readFileSync(join(repoRoot, '.husky', 'pre-commit'), 'utf8'),
    'npm run format:staged\n',
  );

  const tempRepo = mkdtempSync(
    join(tmpdir(), 'genarrative-pre-commit-format-'),
  );
  try {
    git(tempRepo, 'init', '--quiet');
    git(tempRepo, 'config', 'user.email', 'pre-commit-test@example.invalid');
    git(tempRepo, 'config', 'user.name', 'Pre-commit Test');

    const sourcePath = join(tempRepo, 'sample.ts');
    writeFileSync(sourcePath, 'const original = 1;\nconst keep = 2;\n');
    git(tempRepo, 'add', 'sample.ts');
    git(
      tempRepo,
      '-c',
      'commit.gpgsign=false',
      'commit',
      '--quiet',
      '-m',
      'baseline',
    );

    writeFileSync(sourcePath, 'const original={value:1}\nconst keep = 2;\n');
    git(tempRepo, 'add', 'sample.ts');
    writeFileSync(
      sourcePath,
      'const original={value:1}\nconst keep={unstaged:true}\n',
    );

    const lintStaged = spawnSync(
      process.execPath,
      [
        join(repoRoot, 'node_modules', 'lint-staged', 'bin', 'lint-staged.js'),
        '--config',
        '-',
      ],
      {
        cwd: tempRepo,
        encoding: 'utf8',
        env: {
          ...process.env,
          PATH: `${join(repoRoot, 'node_modules', '.bin')}${delimiter}${process.env.PATH ?? ''}`,
        },
        input: JSON.stringify(packageJson['lint-staged']),
      },
    );

    assert.equal(
      lintStaged.status,
      0,
      `${lintStaged.stdout ?? ''}${lintStaged.stderr ?? ''}`,
    );
    assert.equal(
      git(tempRepo, 'show', ':sample.ts'),
      'const original = { value: 1 };\nconst keep = 2;\n',
    );
    assert.equal(
      readFileSync(sourcePath, 'utf8'),
      'const original = { value: 1 };\nconst keep={unstaged:true}\n',
    );
  } finally {
    rmSync(tempRepo, { force: true, recursive: true });
  }
});

function git(cwd, ...args) {
  return execFileSync('git', args, { cwd, encoding: 'utf8' });
}