middleware-io

import { compose } from 'middleware-io'; interface MyContext { now?: number; customData?: string; } const composedMiddleware = compose<MyContext>([ async (context, next) => { // This is the first middleware in the chain. console.log('Step 1: Before next() in first middleware'); // Pass control to the next middleware in the stack. await next(); // Control returns here after subsequent middleware complete. console.log('Step 4: After next() in first middleware'); // Access data modified by later middleware. console.log(`Context.now from next middleware: ${context.now}`); }, async (context, next) => { // This is the second middleware. console.log('Step 2: Before next() in second middleware'); // Modify the context object, which is shared across the chain. context.now = Date.now(); context.customData = 'Hello from second middleware!'; // Pass control to the next middleware (or the final handler if no more middleware). await next(); // Control returns here after the next middleware (or final handler) completes. console.log('Step 3: After next() in second middleware'); } ]); // Execute the composed middleware with an initial context and a final handler. composedMiddleware({}, () => { console.log('Final handler reached (no more middleware).'); return Promise.resolve(); // Ensure the final handler also returns a Promise }) .then(() => { console.log('Middleware chain finished work successfully.'); }) .catch(console.error);