Alternative Node Main Entrypoint with Babel (babel-plugin-module-resolver)

babel.config.js

const { join } = require('path');

module.exports = {
	plugins: [
		[
			'module-resolver',
			{
				root: ['./packages'],
				alias: {
					'^@my-scope\\/([^/]+)$': (match) => {
						const [original, pkg] = match;
						const manifest = require(`./packages/${pkg}/package.json`);
						const src = manifest['main:src'];
						return join(original, src);
					},
				},
			},
		],
	],
};