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[yonathan06]

NowRequestHandler

No longer part of fastify module type, need to be imported directly from fastify-now

import { NowRequestHandler } from 'fastify-now';

also, must include request types in typescript:

export const POST: NowRequestHandler<{ Body: { name: string }; Params: { id: string } }> = async (
  req,
  rep,
) => {
  if (req.body.name === 'Jon Doe') {
    /**
     * in async function, you can return undefined if you already sent a response
     * then it won't try to send a response again with the returned value;
     */
    rep.status(400).send({ message: 'Name can not be Jon Doe' });
    return;
  }
  return { userId: req.params.id };
};