AsyncLocalStorage

ctx.ts

import { AsyncLocalStorage } from 'async_hooks';

class App {
  private asyncLocalStorage = new AsyncLocalStorage();
  private middlewares = [];

  async use(fn, opts) {
    const mw = fn(this, opts);
    this.middlewares.push(mw);
  }

  getContext() {
    return this.asyncLocalStorage.getStore();
  }

  async run() {
    try {
      const ctx = { url: 'https://github.com' };
      await this.asyncLocalStorage.run(ctx, async () => {
        for (const fn of this.middlewares) {
          await fn();
        }
      });
    } catch (err) {
      console.error(err);
    }
  }
}

function m1(app, opts) {
  return async () => {
    const ctx = app.getContext();
    Object.assign(ctx, opts);
    console.log('m1', ctx);
  };
}

const app = new App();
app.use(m1, { a: 1 });
app.use(m1, { b: 1 });
app.run();