JS API to compile ReScript to JS

I’ve tried adding this to Svelte like so:

import { svelte, vitePreprocess } from "@sveltejs/vite-plugin-svelte";
import { exec } from "node:child_process";
import { readFileSync } from "node:fs";
import { promisify } from "node:util";
import { defineConfig } from "vite";

const rescriptPreprocess = () => {
	return {
		name: 'svelte-rescript',
		/**
		 * @param {object} options
		 * @param {string} options.content
		 * @param {string} options.filename
		 * @param {object} options.attributes
		 * @param {'res'} options.attributes.lang
		 */
		script: async ({ content, attributes }) => {
			if (attributes.lang == 'res') {
        console.info('content', content)
        const cmd = `./node_modules/.bin/bsc -bs-package-name svelte-rescript -bs-package-output esmodule:.:esmodule -o tmp -e "${content}"`;

				await promisify(exec)(cmd);
        const jsContent = readFileSync('tmpesmodule').toString();

				return {
					code: jsContent
				};
			}
		}
	};
};

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    svelte({
      preprocess: [
        vitePreprocess(),
        rescriptPreprocess(),
      ]
    })
  ],
});

I have a module like this:

let a = 19

module Testing = {
  let b = a + 10
}

And then a svelte component like this

<script lang="res">
    let a = 44;
    let b = Test.Testing.b;
</script>

<h1>{a + b}</h1>

Then it fails, because it can’t see that module, so this might be one limitation of this method, or maybe I missed something.

9:16:31 AM [vite] Pre-transform error: Error while preprocessing /home/kamov/Desktop/svelte-test/src/App.svelte - Command failed: ./node_modules/.bin/bsc -bs-package-name svelte-rescript -bs-package-output esmodule:.:esmodule -o tmp -e "
    let a = 44;
    let b = Test.Testing.b;
"

  We've found a bug for you!
  /tmp/evalba84ce.res:3:13-26

  1 ┆
  2 ┆ let a = 44;
  3 ┆ let b = Test.Testing.b;
  4 ┆

  The module or file Test can't be found.
  - If it's a third-party dependency:
    - Did you add it to the "bs-dependencies" or "bs-dev-dependencies" in bsconfig.json?
  - Did you include the file's directory to the "sources" in bsconfig.json?