add conditional exports

package.json

@@ -25,6 +25,14 @@
     "trace-opt": "clear && rollup -c  && node --trace-opt dist/test.cjs",
     "postinstall": "node ./sponsor-y.js"
   },
+  "exports": {
+    ".": {
+      "import": "./dist/yjs.mjs",
+      "require": "./dist/yjs.cjs"
+    },
+    "./src/index.js": "./src/index.js",
+    "./tests/testHelper.js": "./tests/testHelper.js"
+  },
   "files": [
     "dist/yjs.*",
     "dist/src",

sponsor-y.js

@@ -1,6 +1,6 @@
 
 try {
-  const log = require('lib0/dist/logging.cja2s')
+  const log = require('lib0/dist/logging.cjs')
 
   log.print()
   log.print(log.BOLD, log.GREEN, log.BOLD, 'Thank you for using Yjs ', log.RED, '❤\n')