How to use JS functions/variables defined in another file?

Question

Currently I have a file src/index.re. I also have a file src/util.js which defines some helper functions I’d like to use. How do I use those functions in src/index.re?

Answer 1

As Neil said in the comments, you'll want to use the bs.module attribute.

Here's a concrete example:

[@bs.module "./util"] external helper : string => int = "";

This says that helper is a function in ./util.js that takes a string and returns an int. You can now use it as an ordinary function:

let n : int = helper("hello");