Cloudflare Workers

Workers provide URLPattern natively, so use the native entry point.

Install


npm install @drashland/drash
npm install --save-dev wrangler

App

A Worker’s module entry point is a default export with a fetch method. Build the chain once at module scope — it is reused across requests in the same isolate.


import {
  Application,
  Resource,
} from "@drashland/drash/modules/http.native.js";
 
class Home extends Resource {
  paths = ["/"];
 
  GET(request) {
    return new Response("Oh so easy");
  }
}
 
const app = Application
  .builder()
  .resources(Home)
  .build();
 
const handleRequest = (request, _bindings) => {
  return app
    .handle(request)
    .catch(() => {
      return new Response("Sorry, but we hit an error!", {
        status: 500,
        statusText: "Internal Server Error",
      });
    });
};
 
export default { fetch: handleRequest };

Run


npx wrangler dev app.js

Then visit the address wrangler prints (http://localhost:8787 by default).

Notes

Every named export of a Worker entry module must be a function, a class, or an ExportedHandler. workerd treats named exports as potential entrypoints and validates them at startup, so a stray constant like:


export const hostname = "localhost";

aborts the Worker before it serves anything, with an error naming that export:


Uncaught TypeError: Incorrect type for map entry 'hostname':
the provided value is not of type 'function or ExportedHandler'.

Keep configuration values as module-local consts, not exports.

A runnable version lives in examples/cloudflare-workers-js.