How to dynamically export in typescript - Stack Overflow

Question

I came into contact with typescript not long ago, and now I need to rewrite the previous project using ts. I encountered a problem:
The ORM of the db in the project needs to be instantiated before it can be used. The explanation is difficult. Please look at the original js code:

    //const Redis =  require('redis')
    let initRedis = function(port, host){
         return new Promise((success, fail) => {
             module.exports.redis = Redis.createClient(port, host);
             success();
         })
    }
    

The following is the ts code I converted:

    const initRedis = function (port:number, host:string): Promise<void> {
        return new Promise((success,fail)=>{
            export let redis = Redis.createClient(port, host);
            success();
        })
    }

Error encountered:

 error TS1184: Modifiers cannot appear here.

How can I correctly export redis after executing the initRedis method?

Answer 1

// xxx.ts
export function initRedis() {}

use

import { initRedis } from 'xx';

Answer 2

This is impossible.
Typescript modules are in compliance with the ES6 module standard, and both import and export are static.

But you can use code like the following to do some workarounds.

// dynamic.ts

const _dynamic = {}

export function addDynamic() {
  _dynamic['Redis'] = function () {
    console.log('I am redis')
  }
}

export const DYNAMIC = _dynamic

// app.ts
import { addDynamic, DYNAMIC } from '@/models'

addDynamic()
DYNAMIC['Redis']()

Answer 3

You can refer here https://blogs.msdn.microsoft....

2.4 is already supported. I’ll write you an example when I get home from work