A guide on crafting a precise description for the 'module.exports' feature

I have successfully exported a function in the following way:

module.exports = function (options: any): RequestHandler {
    // Do something
}

Now, I am attempting to define the exported function properly. However, I am unsure if this is the correct approach:

declare global {
  export function tsm(options: any): RequestHandler
}

While testing, both of the following methods indicate that it is valid:

const tsm = require('ts-middleware')

global.tsm() // Provides intellisense
tsm()        // Also provides intellisense

The fact that global.tsm() is being recognized leads me to believe that my definition may be incorrect. How can I create a proper function definition?

I prefer not to use the function like this:

const tsm = require('ts-middleware')
tsm.tsm()

Instead, I would like to use it like this:

const tsm = require('ts-middleware')
tsm()

Answer №1

If you want to specify typings for a module, use the syntax declare module 'x' {...}. For example:

declare module 'ts-middleware' {
  export = (option: any): RequestHandler
}

However, this step may not be necessary if you are already writing your code in TypeScript. The compiler can automatically generate the typings for you.

All you have to do is include declaration: true in your tsconfig.json:

// tsconfig.json
{
  "compilerOptions": {
    "declaration": true
  }
}

Furthermore, I recommend utilizing ESM in your code. Instead of using module.exports = ..., consider the following:

// named export, recommended
export function foo(options: any): RequestHandler { ... }

// or default export
export default function foo(options: any): RequestHandler { ... }

// importing a named export in TypeScript
import { foo } from 'ts-middleware'

// importing a default export in TypeScript
import foo from 'ts-middleware'

// requiring in JavaScript commonjs
const middleware = require('ts-middleware')
middleware.foo(...)

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