Is it possible to es6 import a commonjs module?

Short Answer: No

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When using es6, you need to export using export and not exports. exports is a commonjs feature primarily used within node and not a web browser.

If you would like to use commonjs you need to use a third party library like requirejs, but this uses require() and not import, and exports and not export. You will then be able to write your code using import/export with typescript but it will be compiled using require and requirejs will handle the rest.

So, to use it in the browser properly, you would do it like so:

test.js

export function Test() {
  console.log('hello')
}

index.js

import { Test } from './test.js'
Test()

Then when you load the file in your html, the function test will execute.

<script src="index.js" type="module"></script>