Add Node ESM Loader and Register Entrypoints (#20274)

* Add Node ESM loader build

This adds a loader build as a first-class export. This will grow in
complexity so it deserves its own module.

* Add Node CommonJS regiter build

This adds a build as a first-class export for legacy CommonJS registration
in Node.js. This will grow in complexity so it deserves its own module.

* Simplify fixture a bit to easier show usage with or without esm

* Bump es version

We leave async function in here which are newer than ES2015.

scripts/rollup/bundles.js

@@ -286,6 +286,24 @@ const bundles = [
     externals: [],
   },
 
+  /******* React Transport DOM Webpack Node.js Loader *******/
+  {
+    bundleTypes: [NODE_ESM],
+    moduleType: RENDERER_UTILS,
+    entry: 'react-transport-dom-webpack/node-loader',
+    global: 'ReactFlightWebpackNodeLoader',
+    externals: [],
+  },
+
+  /******* React Transport DOM Webpack Node.js CommonJS Loader *******/
+  {
+    bundleTypes: [NODE_ES2015],
+    moduleType: RENDERER_UTILS,
+    entry: 'react-transport-dom-webpack/node-register',
+    global: 'ReactFlightWebpackNodeRegister',
+    externals: ['url'],
+  },
+
   /******* React Transport DOM Server Relay *******/
   {
     bundleTypes: [FB_WWW_DEV, FB_WWW_PROD],

scripts/rollup/validate/eslintrc.esm.js

@@ -45,7 +45,7 @@ module.exports = {
     jest: true,
   },
   parserOptions: {
-    ecmaVersion: 2015,
+    ecmaVersion: 2017,
     sourceType: 'module',
   },
   rules: {

scripts/shared/pathsByLanguageVersion.js

@@ -10,6 +10,7 @@
 const esNextPaths = [
   // Internal forwarding modules
   'packages/*/*.js',
+  'packages/*/esm/*.js',
   // Source files
   'packages/*/src/**/*.js',
   'packages/dom-event-testing-library/**/*.js',