angular-cli/packages/angular/cli/lib/init.ts

/**
 * @license
 * Copyright Google Inc. 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.io/license
 */
import 'symbol-observable';
// symbol polyfill must go first
// tslint:disable-next-line:ordered-imports import-groups
import * as fs from 'fs';
import * as path from 'path';
import { SemVer } from 'semver';
import { Duplex } from 'stream';
import { colors } from '../utilities/color';
import { isWarningEnabled } from '../utilities/config';

// Check if we need to profile this CLI run.
if (process.env['NG_CLI_PROFILING']) {
  let profiler: {
    startProfiling: (name?: string, recsamples?: boolean) => void;
    stopProfiling: (name?: string) => unknown;
  };
  try {
    profiler = require('v8-profiler-node8'); // tslint:disable-line:no-implicit-dependencies
  } catch (err) {
    throw new Error(
      `Could not require 'v8-profiler-node8'. You must install it separetely with ` +
        `'npm install v8-profiler-node8 --no-save'.\n\nOriginal error:\n\n${err}`,
    );
  }

  profiler.startProfiling();

  const exitHandler = (options: { cleanup?: boolean; exit?: boolean }) => {
    if (options.cleanup) {
      const cpuProfile = profiler.stopProfiling();
      fs.writeFileSync(
        path.resolve(process.cwd(), process.env.NG_CLI_PROFILING || '') + '.cpuprofile',
        JSON.stringify(cpuProfile),
      );
    }

    if (options.exit) {
      process.exit();
    }
  };

  process.on('exit', () => exitHandler({ cleanup: true }));
  process.on('SIGINT', () => exitHandler({ exit: true }));
  process.on('uncaughtException', () => exitHandler({ exit: true }));
}

(async () => {
  /**
   * Disable Browserslist old data warning as otherwise with every release we'd need to update this dependency
   * which is cumbersome considering we pin versions and the warning is not user actionable.
   * `Browserslist: caniuse-lite is outdated. Please run next command `npm update`
   * See: https://github.com/browserslist/browserslist/blob/819c4337456996d19db6ba953014579329e9c6e1/node.js#L324
   */
  process.env.BROWSERSLIST_IGNORE_OLD_DATA = '1';

  const disableVersionCheckEnv = process.env['NG_DISABLE_VERSION_CHECK'];
  /**
   * Disable CLI version mismatch checks and forces usage of the invoked CLI
   * instead of invoking the local installed version.
   */
  const disableVersionCheck =
    disableVersionCheckEnv !== undefined &&
    disableVersionCheckEnv !== '0' &&
    disableVersionCheckEnv.toLowerCase() !== 'false';

  if (disableVersionCheck) {
    return (await import('./cli')).default;
  }

  let cli;
  try {
    // No error implies a projectLocalCli, which will load whatever
    // version of ng-cli you have installed in a local package.json
    const projectLocalCli = require.resolve('@angular/cli', { paths: [process.cwd()] });
    cli = await import(projectLocalCli);

    const globalVersion = new SemVer(require('../package.json').version);

    // Older versions might not have the VERSION export
    let localVersion = cli.VERSION?.full;
    if (!localVersion) {
      try {
        localVersion = require(path.join(path.dirname(projectLocalCli), '../../package.json'))
          .version;
      } catch (error) {
        // tslint:disable-next-line no-console
        console.error(
          'Version mismatch check skipped. Unable to retrieve local version: ' + error,
        );
      }
    }

    let isGlobalGreater = false;
    try {
      isGlobalGreater = !!localVersion && globalVersion.compare(localVersion) > 0;
    } catch (error) {
      // tslint:disable-next-line no-console
      console.error('Version mismatch check skipped. Unable to compare local version: ' + error);
    }

    if (isGlobalGreater) {
      // If using the update command and the global version is greater, use the newer update command
      // This allows improvements in update to be used in older versions that do not have bootstrapping
      if (process.argv[2] === 'update') {
        cli = await import('./cli');
      } else if (await isWarningEnabled('versionMismatch')) {
        // Otherwise, use local version and warn if global is newer than local
        const warning =
          `Your global Angular CLI version (${globalVersion}) is greater than your local ` +
          `version (${localVersion}). The local Angular CLI version is used.\n\n` +
          'To disable this warning use "ng config -g cli.warnings.versionMismatch false".';

        // tslint:disable-next-line no-console
        console.error(colors.yellow(warning));
      }
    }
  } catch {
    // If there is an error, resolve could not find the ng-cli
    // library from a package.json. Instead, include it from a relative
    // path to this script file (which is likely a globally installed
    // npm package). Most common cause for hitting this is `ng new`
    cli = await import('./cli');
  }

  if ('default' in cli) {
    cli = cli['default'];
  }

  return cli;
})().then(cli => {
  return cli({
    cliArgs: process.argv.slice(2),
    inputStream: process.stdin,
    outputStream: process.stdout,
  });
}).then((exitCode: number) => {
  process.exit(exitCode);
})
.catch((err: Error) => {
  // tslint:disable-next-line no-console
  console.error('Unknown error: ' + err.toString());
  process.exit(127);
});