puppeteer/src/util/getPackageDirectory.ts

import {existsSync} from 'fs';
import {dirname, join, parse} from 'path';

/**
 * @internal
 */
export const getPackageDirectory = (from: string): string => {
  let found = existsSync(join(from, 'package.json'));
  const root = parse(from).root;
  while (!found) {
    if (from === root) {
      throw new Error('Cannot find package directory');
    }
    from = dirname(from);
    found = existsSync(join(from, 'package.json'));
  }
  return from;
};