Merge pull request #3907 from backstage/rugvip/exts

cli: use same extension for chunks as for the main built file

.changeset/dry-dolls-run.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Use consistent file extensions for JS output when building packages.

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

@@ -62,7 +62,7 @@ export const makeConfigs = async (
       output.push({
         dir: 'dist',
         entryFileNames: 'index.cjs.js',
-        chunkFileNames: 'cjs/[name]-[hash].js',
+        chunkFileNames: 'cjs/[name]-[hash].cjs.js',
         format: 'commonjs',
         sourcemap: true,
       });
@@ -71,7 +71,7 @@ export const makeConfigs = async (
       output.push({
         dir: 'dist',
         entryFileNames: 'index.esm.js',
-        chunkFileNames: 'esm/[name]-[hash].js',
+        chunkFileNames: 'esm/[name]-[hash].esm.js',
         format: 'module',
         sourcemap: true,
       });