ask-sdk で非同期処理してからレスポンス ref: https://qiita.com/isann_tech/items/2cfbff4a336d0389d2db

file0.txt

export interface RequestHandler {
    canHandle(handlerInput: HandlerInput): Promise<boolean> | boolean;
    handle(handlerInput: HandlerInput): Promise<Response> | Response;
}

file1.txt

function execute(msg) {
  return new Promise(resolve => {
    setTimeout(() => {
        resolve();
    }, 1000);
  });
}

const MyIntentHandler = {
  canHandle(handlerInput) {
    return handlerInput.requestEnvelope.request.type === 'IntentRequest'
      && handlerInput.requestEnvelope.request.intent.name === 'MyIntent';
  },
  async handle(handlerInput) {
    await execute('なんか非同期処理');
    return handlerInput.responseBuilder
      .speak('Hello My Intent')
      .reprompt('Hello')
      .getResponse();
  }
};