Ambigious imports/inferred file extensions TS (might make package unusable in other projects if not fixed)

[Gustav-Eikaas]

Context

When creating npm packages you have to transpile them without knowing the hosts environment. This can result in major compatibility issues if not done correctly.

Setting the following compilerOptions in tsconfig

module: NodeNext,
moduleResolution: NodeNext

Problem

Today we use the

import { add } from './math' 

But we should use

import { add } from './math.js'

Reference

https://www.typescriptlang.org/docs/handbook/modules/theory.html#module-resolution-for-libraries