cls-hooked-example.ts

import { createNamespace } from 'cls-hooked';
// https://www.npmjs.com/package/cls-hooked

interface MyContext {
  // ...
}

const ns = createNamespace('abc');
const key = 'context';

export function setContext(context: MyContext, callback: () => void): void {
  ns.run(() => {
    ns.set(key, context);
    callback(); // Note: cannot promisify this callback since it modifies the call chain
  });
}

export default function getContext(): MyContext {
  if (ns && ns.active) {
    const context = ns.get(key);
    if (!context) {
      throw new Error('Context not defined');
    }
    return context;
  } else {
    throw new Error('Cannot access context outside call chain');
  }
}