packages/cli: always treat nodejs builtins as external, bit disallow infrontend code

packages/cli/.eslintrc.js

@@ -1,5 +1,5 @@
 module.exports = {
-  extends: [require.resolve('@backstage/cli/config/eslint')],
+  extends: [require.resolve('@backstage/cli/config/eslint.backend')],
   ignorePatterns: ['templates/**'],
   rules: {
     'no-console': 0,

packages/cli/config/eslint.js

@@ -67,6 +67,7 @@ module.exports = {
             name: '@material-ui/icons',
             message: "Please import '@material-ui/icons/<Icon>' instead.",
           },
+          ...require('module').builtinModules,
         ],
       },
     ],

packages/cli/src/lib/packager/config.ts

@@ -72,6 +72,7 @@ export const makeConfigs = async (
       input: 'src/index.ts',
       output,
       preserveEntrySignatures: 'strict',
+      external: require('module').builtinModules,
       plugins: [
         peerDepsExternal({
           includeDependencies: true,

packages/config-loader/.eslintrc.js

@@ -1,3 +1,3 @@
 module.exports = {
-  extends: [require.resolve('@backstage/cli/config/eslint')],
+  extends: [require.resolve('@backstage/cli/config/eslint.backend')],
 };