Function prependToFile

tests/e2e/utils/fs.ts:73–77

(filePath: string, text: string, options?: any)

}

export function prependToFile(filePath: string, text: string, options?: any) {
  return readFile(filePath).then((content: string) =>
    writeFile(filePath, text.concat(content), options),
  );
}

export async function expectFileMatchToExist(dir: string, regex: RegExp): Promise<string> {
  const files = await fs.readdir(dir);