limbo

Writing native ESM and being compatibile with people who use require() in Node.js and older compilers is pretty broken. limbo is here to help.

Run the following command in the root of your package.

$ npx @mikeal/limbo test/test*.js

Compiles CJS versions of the target files and all the local files that are imported by those target files. Using the test files are a good target as they should import all the relevant local files for your package.

dist/cjs-node a CJS version of the package files in order to
support consumers of your library still using require().
dist/cjs-browser a CJS version of the package files targeted
for the browser in order to maintain compatibility with older compilers
like Webpack 4.x because they have terrible opinions about the CJS
representation of ESM modules

package.json

You'll still need to reference all of these files in your package.json.

It's a bit complicated to explain, so there's a flag you can use that will mutate the local package.json and add all the required browser and export fields.

What is still broken in native ESM?

You still can't use any versions of Node.js prior to v12 or even early versions of v12 and v14 that were released before ESM was behind a flag. There's not much we can do there.