Function execAndWaitForOutputToMatch

tests/e2e/utils/process.ts:329–357

(
  cmd: string,
  args: string[],
  match: RegExp,
  env?: NodeJS.ProcessEnv,
)

}

export async function execAndWaitForOutputToMatch(
  cmd: string,
  args: string[],
  match: RegExp,
  env?: NodeJS.ProcessEnv,
) {
  if (cmd === 'ng' && args[0] === 'serve') {
    // Accept matches up to 20 times after the initial match.
    // Useful because the Webpack watcher can rebuild a few times due to files changes that
    // happened just before the build (e.g. `git clean`).
    // This seems to be due to host file system differences, see
    // https://nodejs.org/docs/latest/api/fs.html#fs_caveats
    const maxRetries = 20;
    let lastResult = await _exec({ waitForMatch: match, env }, cmd, args);

    for (let i = 0; i < maxRetries; i++) {
      try {
        lastResult = await waitForAnyProcessOutputToMatch(match, 2500);
      } catch {
        // If we timeout (no new match found), we assume the process is stable.
        break;
      }
    }

    return lastResult;
  } else {
    return _exec({ waitForMatch: match, env }, cmd, args);
  }
}

export function ng(...args: string[]) {
  const argv = getGlobalVariable('argv');