Add just the necessary files to rollup watch mode

packages/addon-dev/src/rollup-keep-assets.ts

@@ -14,12 +14,6 @@ export default function keepAssets({
   return {
     name: 'copy-assets',
 
-    // Prior to https://github.com/rollup/rollup/pull/5270, we cannot call this
-    // from within `generateBundle`
-    buildStart() {
-      this.addWatchFile(from);
-    },
-
     // imports of assets should be left alone in the source code. This can cover
     // the case of .css as defined in the embroider v2 addon spec.
     async resolveId(source, importer, options) {
@@ -44,6 +38,8 @@ export default function keepAssets({
         globs: include,
         directories: false,
       })) {
+        this.addWatchFile(join(from, name));
+
         this.emitFile({
           type: 'asset',
           fileName: name,

packages/addon-dev/src/rollup-public-entrypoints.ts

@@ -16,14 +16,14 @@ export default function publicEntrypoints(args: {
   return {
     name: 'addon-modules',
     async buildStart() {
-      this.addWatchFile(args.srcDir);
-
       let matches = walkSync(args.srcDir, {
         globs: [...args.include, '**/*.hbs', '**/*.ts', '**/*.gts', '**/*.gjs'],
         ignore: args.exclude,
       });
 
       for (let name of matches) {
+        this.addWatchFile(path.join(args.srcDir, name));
+
         // the matched file, but with the extension swapped with .js
         let normalizedName = normalizeFileExt(name);