tip

Don't know what a resolver is? See the Architecture section.

The best and most agnostic resolver is using promise, generally every serverless environment supports asynchronous handlers.

When the handler is created with getHandler, it will return an promise which is resolved when your framework send the response and the adapter transform the response in the way of your cloud can handle.

You can use this resolver with any cloud (except Huawei), with any framework or any adapter.

caution

Only Huawei doesn't support Promise, or it was buggy in my time, so I suggest you use Callback Resolver.

Usage

To use, you can import and call the method setResolver, as per the code below:

index.ts

import { ServerlessAdapter } from '@h4ad/serverless-adapter';
import { PromiseResolver } from '@h4ad/serverless-adapter/resolvers/promise';

const express = require('express');

const app = express();
export const handler = ServerlessAdapter.new(app)
  .setResolver(new PromiseResolver())
  // continue to set the other options here.
  //.setFramework(new ExpressFramework())
  //.setHandler(new DefaultHandler())
  //.addAdapter(new AlbAdapter())
  //.addAdapter(new SQSAdapter())
  //.addAdapter(new SNSAdapter())
  // after put all methods necessary, just call the build method.
  .build();

tip

To know more about how AWS deals with async handlers, see NodeJS Handler section.