How to properly export TypeScript methods in node.js app

Question

In my node.js app, I have a TypeScript file (util.ts) that defines methods:

export function myFunc() { console.log(42); }

And I use it in another typescript file:

const util = require('./util');
util.myFunc();

This works fine, but the type of util const is any. How can I make it typed, in a way that when I type util., my editor will know how to auto-complete, and when I write:

util.myOtherFunc();

TypeScript compiler will fail and say that util doesn't have a myOtherFunc method?

basarat · Accepted Answer · 2016-01-07 22:36:58Z

1

How can I make it typed

Instead of :

const util = require('./util');

Do :

import util = require('./util');

More

https://basarat.gitbooks.io/typescript/content/docs/project/modules.html

answered Jan 7, 2016 at 22:36

basarat

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1 Comment

splintor Over a year ago

I tried using import, but it failed. Further checking revealed that because our TypeScript project was ported from JavaScript, we were still using the node.js syntax exports.myFunc (and not as I wrote in my question), and when I tried to import it, I got "error TS2306: File 'util.ts' is not a module.". I now realize that I need to use the TypeScript syntax "export function" for the TypeScript compiler to consider this as a module and transform it to the "exports.myFunc =" form. Thanks for answering!

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