Hooks

onMapResponse

This is the last hook that is ran before the response is sent to the client, running after the response has been validated.

Building the Response

Most of the time, Zeta is capable of automatically build the Response object for you based on the value returned by the handler and it's content type. However, if you come across a situation where Zeta does not support the content type you need, use this hook to build the response manually.

import { Sharp } from "sharp";

const app = createApp().onMapResponse(({ set, response }) => {
  if (response instanceof Sharp) {
    return new Response(await response.jpeg().toBuffer(), {
      status: set.status,
      headers: {
        ...set.headers,
        "Content-Type": "image/jpeg",
      },
    });
  }
});

In this example, we are converting a Sharp instance (class storing image modifications) to a response.