Function findUp

packages/angular_devkit/schematics_cli/bin/schematics.ts:179–200

(names: string | string[], from: string)

}

function findUp(names: string | string[], from: string) {
  const filenames = Array.isArray(names) ? names : [names];

  let currentDir = path.resolve(from);
  while (true) {
    for (const name of filenames) {
      const p = path.join(currentDir, name);
      if (existsSync(p)) {
        return p;
      }
    }

    const parentDir = path.dirname(currentDir);
    if (parentDir === currentDir) {
      break;
    }

    currentDir = parentDir;
  }

  return null;
}

/**
 * return package manager' name by lock file