diff --git a/core/package.json b/core/package.json
index 097cba4b5..ba959fa23 100644
--- a/core/package.json
+++ b/core/package.json
@@ -8,6 +8,10 @@
   "license": "MIT",
   "main": "./cjs/index.js",
   "module": "./esm/index.js",
+  "exports": {
+    "require": "./cjs/index.js",
+    "import": "./esm/index.js"
+  },
   "scripts": {
     "bundle": "ncc build src/index.tsx --target web --filename codemirror && npm run bundle:min",
     "bundle:watch": "ncc watch src/index.tsx --target web --filename codemirror",
diff --git a/extensions/basic-setup/package.json b/extensions/basic-setup/package.json
index c95f3e72e..98b3ae96b 100644
--- a/extensions/basic-setup/package.json
+++ b/extensions/basic-setup/package.json
@@ -8,6 +8,10 @@
   "license": "MIT",
   "main": "./cjs/index.js",
   "module": "./esm/index.js",
+  "exports": {
+    "require": "./cjs/index.js",
+    "import": "./esm/index.js"
+  },
   "scripts": {
     "watch": "tsbb watch src/*.ts --use-babel",
     "build": "tsbb build src/*.ts --use-babel"