This is an example of a bucklescript project that runs using ES6 modules without bundling.
The main limitation is that you can only depend on other ES6-compatible modules, which probably means only other bucklescript projects. As soon as you try to require anything else out of your node_modules folder a bundler is almost certainly required (since they're generally distributed as commonjs).
This works without bundling on all current browsers except IE and FireFox (which still has it behind a flag until v60).
npm link bs-platformbsb -w- load
demo.htmlin a browser (must use a webserver due to CORS restrictions)
At this point changes made in the source code will be ready for a browser refresh before you're able to trigger the refresh 😉
It wouldn't be difficult to create a server with livereload, but I don't need that nor am I very familiar with setting it up.
The HTML demo includes a nomodule fallback for older browsers, to compile it:
npm inpm run bundle
Tnis uses rollup, with a dual config in order to minify output on npm publish.