refactor(deps): simplify pluginutils handling after rolldown move

Match the lighter-weight handling from #1569:

- packages/core/package.json: collapse the two pluginutils exports back
  to single .mjs strings. TypeScript already resolves a sibling .d.mts
  for an .mjs path under moduleResolution: bundler / node16, so the
  explicit `types` entries were redundant.
- packages/tools/src/sync-remote-deps.ts: drop the parallel .mjs
  branch in transformPluginutilsExport — once we stop wrapping string
  exports into objects, the matching `types` derivation isn't needed
  either.
- .github/actions/build-upstream/action.yml, justfile: drop the
  `pnpm --filter @rolldown/pluginutils build` step. Since rolldown
  moved pluginutils out of its workspace into a standalone npm
  package (rolldown/plugins), no workspace package matches that
  filter — the step was a silent no-op (`No projects matched the
  filters`).

Author: fengmk2

.github/actions/build-upstream/action.yml

@@ -60,7 +60,6 @@ runs:
     - name: Build upstream TypeScript packages
       shell: bash
       run: |
-        pnpm --filter @rolldown/pluginutils build
         pnpm --filter rolldown build-node
         pnpm --filter vite build-types
         pnpm --filter "@voidzero-dev/*" build

justfile

@@ -42,7 +42,6 @@ _fix_symlinks:
 
 build:
   pnpm install
-  pnpm --filter @rolldown/pluginutils build
   pnpm --filter rolldown build-binding:release
   pnpm --filter rolldown build-node
   pnpm --filter vite build-types

packages/core/package.json

@@ -85,14 +85,8 @@
       "default": "./dist/rolldown/plugins-index.mjs",
       "types": "./dist/rolldown/plugins-index.d.mts"
     },
-    "./rolldown/pluginutils": {
-      "default": "./dist/pluginutils/index.mjs",
-      "types": "./dist/pluginutils/index.d.mts"
-    },
-    "./rolldown/pluginutils/filter": {
-      "default": "./dist/pluginutils/filter/index.mjs",
-      "types": "./dist/pluginutils/filter/index.d.mts"
-    },
+    "./rolldown/pluginutils": "./dist/pluginutils/index.mjs",
+    "./rolldown/pluginutils/filter": "./dist/pluginutils/filter/index.mjs",
     "./rolldown/utils": {
       "default": "./dist/rolldown/utils-index.mjs",
       "types": "./dist/rolldown/utils-index.d.mts"

packages/tools/src/sync-remote-deps.ts

@@ -277,15 +277,6 @@ function transformPluginutilsExport(
         },
       ];
     }
-    if (newValue.endsWith('.mjs')) {
-      return [
-        newExportPath,
-        {
-          default: newValue,
-          types: newValue.replace(/\.mjs$/, '.d.mts'),
-        },
-      ];
-    }
     return [newExportPath, newValue];
   }
 
@@ -296,8 +287,6 @@ function transformPluginutilsExport(
     if (importPath && !('types' in newValue)) {
       if (importPath.endsWith('.js')) {
         newValue.types = importPath.replace(/\.js$/, '.d.ts');
-      } else if (importPath.endsWith('.mjs')) {
-        newValue.types = importPath.replace(/\.mjs$/, '.d.mts');
       }
     }
   }