Update sample-rollup.config.js

packages/addon-dev/sample-rollup.config.js

@@ -1,15 +1,28 @@
-import babel from '@rollup/plugin-babel';
+import { babel } from '@rollup/plugin-babel';
+import { nodeResolve } from '@rollup/plugin-node-resolve';
+
 import { Addon } from '@embroider/addon-dev/rollup';
 
+import packageJson from './package.json';
+
 const addon = new Addon({
   srcDir: 'src',
   destDir: 'dist',
 });
 
+const extensions = ['.js', '.ts'];
+
 export default {
+  // This tells rollup to follow the node-resolution algorithm for finding
+  // dependencies / and files within those dependencies
+  nodeResolve({ extensions }),
+
   // This provides defaults that work well alongside `publicEntrypoints` below.
   // You can augment this if you need to.
   output: addon.output(),
+
+  // This prevents peerDependencies from being included in your bundle
+  external: Object.keys(packageJson['peerDependencies']),
 
   plugins: [
     // These are the modules that users should be able to import from your
@@ -26,6 +39,7 @@ export default {
     // template colocation.
     babel({
       plugins: ['@embroider/addon-dev/template-colocation-plugin'],
+      extensions,
     }),
 
     // Ensure that standalone .hbs files are properly integrated as Javascript.