Configure the nodeModules loader to do what its name suggests

Fixes #1892
Closes #1893

package/rules/node_modules.js

@@ -5,6 +5,7 @@ const { nodeEnv } = require('../env')
 // Compile standard ES features for JS in node_modules with Babel.
 module.exports = {
   test: /\.(js|mjs)$/,
+  include: /node_modules/,
   exclude: /@babel(?:\/|\\{1,2})runtime/,
   use: [
     {