从打字稿中的文件中获取导出的函数名称

Question

I need to get exported function names from a file for intelliSense purpose.

let's say we have the following file with some functions:

//demo.ts
export const foo = () => {};
export const bor = () => {};

Now let import everything from the file and passes it to a generic function:

import * as demo from './demo'

function myGenericFunction<T>(module: T, functionName: ? ){
}

myGenericFunction(demo ,'foo');

The question is how to set the type of functionName to become like foo|bar .

Answer 1

You can use keyof T just as you would for the key of any other type:

import * as demo from './demo'

function myGenericFunction<T>(module: T, functionName: keyof T ){
}

myGenericFunction(demo ,'foo');
myGenericFunction(demo ,'bor');
myGenericFunction(demo ,'bar'); // error