How to implement export similar to export * as in TypeScript?

When migrating from Vue2 JavaScript to Vue3 TypeScript, developers often face module import/export challenges, especially when dealing with a large number export * as statements. export * as commonly used in JavaScript is not directly supported in TypeScript, but this does not mean that we cannot implement similar functions.

JavaScript code example:

 // api.js
import request from '@/utils/request';
export function apia(data) {
  return request({ ... });
}
export function apib(params) {
  return request({ ... });
}

// Use export * as api from './api.js';
api.apia();

In TypeScript, we can use the default export mechanism to achieve the same effect:

 // api.ts
import request from '@/utils/request';
export function apia(data: any): any {
  return request({ ... });
}
export function apib(params: any): any {
  return request({ ... });
}

export default {
  apia,
  apib,
};

Then, import and use in other modules:

 // Use import Api from './api.ts';

Api.apia();

Through this default export method, we can combine multiple functions into one object for export. When using it, we just need to import the object and then access the functions in it through point syntax, thus simulating the convenience of export * as in TypeScript, simplifying code migration and maintenance work. It should be noted that according to the actual situation, you need to add appropriate TypeScript type annotations to the function parameters and return values.

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