feat(packaging): ship CommonJS builds alongside ESM for v2 packages (#2405)

packages/middleware/hono/package.json

@@ -23,10 +23,17 @@
     ],
     "exports": {
         ".": {
-            "types": "./dist/index.d.mts",
-            "import": "./dist/index.mjs"
+            "import": {
+                "types": "./dist/index.d.mts",
+                "default": "./dist/index.mjs"
+            },
+            "require": {
+                "types": "./dist/index.d.cts",
+                "default": "./dist/index.cjs"
+            }
         }
     },
+    "main": "./dist/index.cjs",
     "types": "./dist/index.d.mts",
     "files": [
         "dist"

packages/middleware/hono/tsdown.config.ts

@@ -3,7 +3,8 @@ import { defineConfig } from 'tsdown';
 export default defineConfig({
     failOnWarn: 'ci-only',
     entry: ['src/index.ts'],
-    format: ['esm'],
+    format: ['esm', 'cjs'],
+    fixedExtension: true,
     outDir: 'dist',
     clean: true,
     sourcemap: true,