Import matter-js in typescript project

You can try to load it using import * as matter from 'matter-js', that should work.

I load the matter.js library with a script tag. Did you forget that?

<script src="js/matter.min.js"></script>

And I installed the typings with

npm install @types/matter-js

Unfortunately, the typescript lib seems outdated. Last commit 2 years ago. Parameters that should be optional are instead required in the typescript definitions...