Function launchChildProcess

lib/internal/debugger/inspect_helpers.js:136–181

(childArgs, inspectHost, inspectPort,
                                  childOutput, options = { __proto__: null })

}

async function launchChildProcess(childArgs, inspectHost, inspectPort,
                                  childOutput, options = { __proto__: null }) {
  if (!options.skipPortPreflight) {
    await portIsFree(inspectHost, inspectPort);
  }

  const args = [`--inspect-brk=${inspectPort}`];
  ArrayPrototypePushApply(args, childArgs);

  const child = spawn(process.execPath, args);
  child.stdout.setEncoding('utf8');
  child.stderr.setEncoding('utf8');
  child.stdout.on('data', (chunk) => childOutput(chunk, 'stdout'));
  child.stderr.on('data', (chunk) => childOutput(chunk, 'stderr'));

  let stderrOutput = '';
  return new Promise((resolve, reject) => {
    function rejectLaunch(message) {
      reject(new ERR_DEBUGGER_STARTUP_ERROR(message, { childStderr: stderrOutput }));
    }

    function onExit(code, signal) {
      const suffix = signal !== null ? ` (${signal})` : ` (code ${code})`;
      rejectLaunch(`Target exited before the inspector was ready${suffix}`);
    }

    function onError(error) {
      rejectLaunch(error.message);
    }

    function onStderr(text) {
      stderrOutput += text;
      const debug = RegExpPrototypeExec(debugRegex, stderrOutput);
      if (debug) {
        child.stderr.removeListener('data', onStderr);
        child.removeListener('exit', onExit);
        child.removeListener('error', onError);
        resolve([child, Number(debug[2]), debug[1]]);
      }
    }

    child.once('exit', onExit);
    child.once('error', onError);
    child.stderr.on('data', onStderr);
  });
}

module.exports = {
  ensureTrailingNewline,