beforeEach(() => {
    runner = new SchematicTestRunner('test', require.resolve('../migrations.json'));
    host = new TempScopedNodeJsSyncHost();
    tree = new UnitTestTree(new HostTree(host));

    writeFile('/tsconfig.json', JSON.stringify({
      compilerOptions: {
        lib: ['es2015'],
      }
    }));

    warnOutput = [];
    runner.logger.subscribe(logEntry => {
      if (logEntry.level === 'warn') {
        warnOutput.push(logEntry.message);
      }
    });

    previousWorkingDir = shx.pwd();
    tmpDirPath = getSystemPath(host.root);

    // Switch into the temporary directory path. This allows us to run
    // the schematic against our custom unit test tree.
    shx.cd(tmpDirPath);
  });

  beforeEach(() => {
    runner = new SchematicTestRunner('test', require.resolve('../migrations.json'));
    host = new TempScopedNodeJsSyncHost();
    tree = new UnitTestTree(new HostTree(host));

    writeFile('/tsconfig.json', JSON.stringify({
      compilerOptions: {
        lib: ['es2015'],
      }
    }));
    writeFile('/angular.json', JSON.stringify({
      projects: {t: {architect: {build: {options: {tsConfig: './tsconfig.json'}}}}}
    }));

    previousWorkingDir = shx.pwd();
    tmpDirPath = getSystemPath(host.root);

    // Switch into the temporary directory path. This allows us to run
    // the schematic against our custom unit test tree.
    shx.cd(tmpDirPath);
  });

export function bootstrapFromCli(additionRunners: RunnerWithSchema[] = []): Promise<any> {
  const argv = usage('Usage: $0 [options]')
    .example('$0 -c npt.config.test.js', `
      Run node-private-tools tasks. If config option is not set, try to follow the finding order blow:

            npt property in a package.json file.
            .nptrc(.json|.yml) file with JSON or YAML syntax.
            npt.config.js JS file exporting the object.`)
    .options({
      c: {
        alias: 'config',
        nargs: 1,
        describe: 'Config file path.',
      }
    })
    .help('h')
    .alias('h', 'help');

  let configPath = argv.argv.c;
  const searchPath = configPath ? null : pwd().toString();
  configPath = configPath ? normalize(configPath) : undefined;

  const load: Promise<{ config: any, filepath: string }> = cosmiconfig('npt', cosmiconfigOptions).load(searchPath, configPath);
  return load.then(({ config, filepath }) => {
    console.log(chalk.yellow(`Loading ${filepath}`));
    return bootstrap(config, additionRunners);
  }).catch(err => {
    if (configPath) {
      console.log();
      console.log(chalk.yellow(`Error from ${configPath}:`));
    } else {
      argv.showHelp();
    }
    return Promise.reject(err);
  });
}

export function reqCwdSilent(moduleId): any | null {
  return reqFrom.silent(pwd().toString(), moduleId);
}

export function reqCwd(moduleId) {
  return reqFrom(pwd().toString(), moduleId);
}