Ways to enhance the Response in Opine (Deno framework)

Here is my question:

Is there a way to extend the response in Opine (Deno framework) in order to create custom responses?

For instance, I would like to have the ability to use:

res.success(message)

Instead of having to set HTTP codes manually each time like this:

res.setStatus(200).json({data: "success" });

I attempted to extend the response using the method shown in this link: https://deno.land/x/[email protected]/test/units/app.response.test.ts

This is the code snippet I tried:

import { opine } from "https://deno.land/x/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="046b746d6a6144362a352a#" >[email protected]</a>/mod.ts";

const app = opine();

(app.response as any).shout = function (str: string) {
    this.send(str.toUpperCase());
};

app.get("/", (req, res) => {
    res.shout("hello")
})

app.listen(3000);
console.log("Opine started on port 3000");

export { app };

However, when I run the program, I encounter the following error:

error: TS2339 [ERROR]: Property 'shout' does not exist on type 'OpineResponse<any>'.
    res.shout("hello")
        ~~~~~

Your help is greatly appreciated.

Answer №1

There isn't a straightforward way to accomplish this task without branching off opine and adjusting the fundamental functions and methods that are integral to the library.

To satisfy the compiler, one option is to declare the types at the specific invocation points (for example, by utilizing any similar to what's done in the linked test file). Another approach involves using an assertion function like demonstrated in the code refactor sample below:

so-71990454.ts:

import { assert } from "https://deno.land/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="d4a7a0b094e4fae5e7e2fae4">[email protected]</a>/testing/asserts.ts";
import {
  type Opine,
  opine,
  type OpineResponse,
} from "https://deno.land/x/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="a5cad5cccbc0e5978b948b9
0">[email protected]</a>/mod.ts";

// Add your custom type extensions here
type ExtendedOpineResponse = {
  shout(body: string): void;
};

// Implement the custom extensions in this section
function extendOpineApp(app: Opine): void {
  // deno-lint-ignore no-explicit-any
  (app.response as any).shout = function (str: string) {
    this.send(str.toUpperCase());
  };
}

// This function asserts feature tests for each item
function assertIsExtendedResponse<T extends OpineResponse>(
  response: T,
): asserts response is T & ExtendedOpineResponse {
  assert(
    // deno-lint-ignore no-explicit-any
    typeof (response as any).shout === "function",
    'Method "shout" not found on response',
  );
}

export const app = opine();
// Call the extension function after creating the app
extendOpineApp(app);

app.get("/", (_req, res) => {
  assertIsExtendedResponse(res);
  res.shout("hello");
});

app.listen(3000);
console.log("Opine started on port 3000");

You can observe that running type-checking on the module does not yield any diagnostic errors:

$ deno --version
deno 1.21.0 (release, x86_64-unknown-linux-gnu)
v8 10.0.139.17
typescript 4.6.2

$ deno check so-71990454.ts

$ echo $?
0

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