angular/scripts/diff-release-package.mts

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.dev/license
 */

/**
 * Script that can be used to compare the local `npm_package` snapshot artifact
 * with the snapshot artifact from GitHub at upstream `HEAD`.
 *
 * This is useful during the `rules_js` migration to verify the npm artifact
 * doesn't differ unexpectedly.
 *
 * Example command: pnpm diff-release-package @angular/cli
 */

import {GitClient} from '@angular/ng-dev';
import childProcess from 'node:child_process';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import sh from 'shelljs';
import {glob} from 'tinyglobby';

// Do not remove `.git` as we use Git for comparisons later.
// Also preserve `uniqueId` as it's irrelevant for the diff and not included via Bazel.
// The `README.md` is also put together outside of Bazel, so ignore it too.
const SKIP_FILES = [/^README\.md$/, /^uniqueId$/, /\.map$/];

const packageName = process.argv[2];
if (!packageName) {
  console.error('Expected package name to be specified.');
  process.exit(1);
}

try {
  await main(packageName);
} catch (e) {
  console.error(e);
  process.exitCode = 1;
}

async function main(packageName: string) {
  const bazel = process.env.BAZEL ?? 'bazel';
  const git = await GitClient.get();
  const targetDir = packageName.replace(/^@/g, '').replace(/-/g, '_');

  const snapshotRepoName = `angular/${packageName}-builds`;

  const tmpDir = await fs.promises.mkdtemp(
    path.join(os.tmpdir(), `diff-release-package-${snapshotRepoName.replace(/\//g, '_')}`),
  );

  console.info(`Cloning snapshot repo (${snapshotRepoName}) into ${tmpDir}..`);
  git.run(['clone', '--depth=1', `https://github.com/${snapshotRepoName}.git`, tmpDir]);
  console.info(`--> Cloned snapshot repo.`);

  const bazelBinDir = childProcess
    .spawnSync(bazel, ['info', 'bazel-bin'], {
      shell: true,
      encoding: 'utf8',
      stdio: ['pipe', 'pipe', 'inherit'],
    })
    .stdout.trim();
  if (bazelBinDir === '') {
    throw new Error('Could not determine bazel-bin directory.');
  }

  const outputPath = path.join(bazelBinDir, 'packages/', targetDir, 'npm_package');

  // Delete old directory to avoid surprises, or stamping being outdated.
  await deleteDir(outputPath);

  childProcess.spawnSync(
    bazel,
    ['build', `//packages/${targetDir}:npm_package`, '--config=snapshot-build'],
    {
      shell: true,
      stdio: 'inherit',
      encoding: 'utf8',
    },
  );

  console.info('--> Built npm package with --config=snapshot-build');
  console.error(`--> Output: ${outputPath}`);

  const removeTasks: Promise<void>[] = [];
  for (const subentry of await glob('**/*', {
    dot: true,
    cwd: tmpDir,
    onlyFiles: true,
    ignore: ['.git'],
  })) {
    if (!SKIP_FILES.some((s) => s.test(subentry))) {
      continue;
    }

    removeTasks.push(fs.promises.rm(path.join(tmpDir, subentry), {maxRetries: 3}));
  }
  await Promise.all(removeTasks);

  // Stage all removed files that were skipped; to exclude them from the diff.
  git.run(['add', '-A'], {cwd: tmpDir});
  git.run(['commit', '-m', 'Delete skipped files for diff'], {cwd: tmpDir});

  const copyTasks: Promise<void>[] = [];
  for (const subentry of await glob('**/*', {
    dot: true,
    cwd: outputPath,
    onlyFiles: true,
    ignore: ['.git'],
  })) {
    if (SKIP_FILES.some((s) => s.test(subentry))) {
      continue;
    }

    copyTasks.push(
      fs.promises.cp(path.join(outputPath, subentry), path.join(tmpDir, subentry), {
        recursive: true,
      }),
    );
  }
  await Promise.all(copyTasks);

  git.run(['config', 'core.filemode', 'false'], {cwd: tmpDir});

  const diff = git.run(['diff', '--color'], {cwd: tmpDir}).stdout;

  console.info('\n\n----- Diff ------');
  console.info(diff);

  await deleteDir(tmpDir);
}

async function deleteDir(dirPath: string) {
  if (!fs.existsSync(dirPath)) {
    return;
  }

  // Needed as Bazel artifacts are readonly and cannot be deleted otherwise.
  sh.chmod('-R', 'u+w', dirPath);
  await fs.promises.rm(dirPath, {recursive: true, force: true, maxRetries: 3});
}