Creating a Middleware

A middleware must implement VCLightMiddleware.

Middleware interface

import { VCLightMiddleware, VCLightRequest, VCLightResponse, VCLightApp } from "vclight";

export default interface VCLightMiddleware {
    process(request: VCLightRequest, response: VCLightResponse, app: VCLightApp): Promise<void>;
    post(request: VCLightRequest, response: VCLightResponse, app: VCLightApp): Promise<void>;
}

• process runs in registration order
• post runs in reverse order after all process calls

Example middleware

import { VCLightMiddleware, VCLightRequest, VCLightResponse, VCLightApp } from "vclight";

class ExampleMiddleware implements VCLightMiddleware {
    async process(request: VCLightRequest, response: VCLightResponse, _app: VCLightApp): Promise<void> {
        if (request.url === "/hello/") {
            response.response = "Hello!";
            response.end = true;
        }
    }

    async post(_request: VCLightRequest, _response: VCLightResponse, _app: VCLightApp): Promise<void> {
        // Optional post-processing
    }
}

Apply middleware

const exampleMiddleware = new ExampleMiddleware();
app.use(exampleMiddleware);