Request Context creation example for module federation request context cache

requestContext.js

// utils/requestContext.js
import { createNamespace } from 'cls-hooked'

// context variable here may be global, but the data stored is 
// not shared among different requests
const context = createNamespace(`app:requestData`)

// use this middleware in your express middleware chain, as early as possible
export function expressMiddleware (req, res, next) {
  context.run(function () {
    context.set('requestContext', {})
    next()
  })
}
export const getFromRequestContext = () => {
  return context.get('requestContext')
}

export const addToRequestContext = (slave, container) => {
  const ctx = context.get('requestContext')
  ctx[slave] = container
}