diff --git a/packages/labextension/package.json b/packages/labextension/package.json
index 41683b03..e2777ad1 100644
--- a/packages/labextension/package.json
+++ b/packages/labextension/package.json
@@ -25,7 +25,8 @@
     "lib/*.js.map",
     "lib/*.d.ts",
     "style/*.css",
-    "schema/*.json"
+    "schema/*.json",
+    "src/*.ts"
   ],
   "style": "style/index.css",
   "scripts": {
diff --git a/packages/nbdime/package.json b/packages/nbdime/package.json
index 58e45182..b8c9049c 100644
--- a/packages/nbdime/package.json
+++ b/packages/nbdime/package.json
@@ -10,6 +10,10 @@
   "directories": {
     "lib": "lib/"
   },
+  "files": [
+    "lib/**/*.{js,js.map,d.ts}",
+    "src/**/*.ts"
+  ],
   "scripts": {
     "build": "tsc --project . && node scripts/copy-files.js",
     "build:dev": "tsc --project .",