// main function to run the lib/internal/main scripts and make sure that
  // the main function set in the snapshot building process takes precedence.
  validateFunction(callback, 'callback');
  if (deserializeMainIsSet) {
    throw new ERR_DUPLICATE_STARTUP_SNAPSHOT_MAIN_FUNCTION();
  }
  deserializeMainIsSet = true;

  _setDeserializeMainFunction(function deserializeMain() {
    const {
      prepareMainThreadExecution,
      markBootstrapComplete,
    } = require('internal/process/pre_execution');

    // This should be in sync with run_main_module.js until we make that
    // a built-in main function.
    // TODO(joyeecheung): make a copy of argv[0] and insert it as argv[1].
    prepareMainThreadExecution(false);
    markBootstrapComplete();
    callback(data);
  });
}

module.exports = {
  initializeCallbacks,
  runDeserializeCallbacks,
  throwIfBuildingSnapshot,
  // Exposed to require('v8').startupSnapshot
  namespace: {
    addDeserializeCallback,
    addSerializeCallback,
    setDeserializeMainFunction,
    isBuildingSnapshot,
  },
  addAfterUserSerializeCallback,
};