fix: Make package importable for type="module" projects

Explicitly set the type of the dist files by changing the file
extension to `mjs` or `cjs` respectively.

Signed-off-by: Ferdinand Thiessen <rpm@fthiessen.de>

package.json

@@ -2,12 +2,15 @@
   "name": "@nextcloud/event-bus",
   "version": "3.0.2",
   "description": "A simple event bus to communicate between Nextcloud components.",
-  "main": "dist/index.js",
-  "module": "dist/index.esm.js",
+  "type": "module",
+  "main": "dist/index.es5.cjs",
   "types": "dist/index.d.ts",
   "exports": {
-    "import": "./dist/index.esm.js",
-    "require": "./dist/index.js"
+    ".": {
+      "import": "./dist/index.esm.mjs",
+      "require": "./dist/index.es5.cjs",
+      "types": "./dist/index.d.ts"
+    }
   },
   "files": [
     "dist/"

rollup.config.js

@@ -25,7 +25,7 @@ export default [
     ],
     output: [
       {
-        dir: 'dist',
+        file: 'dist/index.es5.cjs',
         format: 'cjs',
         sourcemap: true,
       },
@@ -37,7 +37,7 @@ export default [
     plugins: [typescript(), replacePlugin],
     output: [
       {
-        file: 'dist/index.esm.js',
+        file: 'dist/index.esm.mjs',
         format: 'esm',
         sourcemap: true,
       },