common-js entrypoint for projects that are only available as ecmascript modules

index.cjs

const Module = require('module')
const orig = Module._extensions['.js']
const fs = require('fs')

const delegateEcmascriptModulePath = '../esm/index.js';
const dependenciesInEcmascriptModulesOnly = [basename(__dirname) + "/esm/", "/del/", "/p-map/"];

Module._extensions['.js'] = function (module, filename) {
    try {
        return orig(module, filename)
    } catch (e) {
        if (e.code === 'ERR_REQUIRE_ESM') {
            const content = fs.readFileSync(filename, 'utf8')
            module._compile(content, filename)
            // --
            return
        }
        throw e
    }
}
require("@babel/register")({
    "only": [
        (path) => {
            return dependenciesInEcmascriptModulesOnly.some(
                pattern => path.includes(pattern)
            );
        }],
    "presets": ["@babel/preset-env", "@babel/preset-react"],
    "plugins": ["babel-plugin-transform-import-meta"]
});

module.exports = require(ecmascriptModulePath)