diff --git a/.npmignore b/.npmignore
index e9e859a..4fba090 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,5 +1,6 @@
-coverage/
-codegen/
+coverage/*
+codegen/*
 jest.config.json
 .travis.yml
 tslint.json
+src/*
diff --git a/package.json b/package.json
index ae5a9ec..afa9200 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,7 @@
         "lint:fix": "yarn lint --fix",
         "node:codegen": "node codegen/dist/emit",
         "test": "jest --config jest.config.json",
+        "prepack": "yarn build",
         "verify": "npm-run-all -s build lint test"
     },
     "devDependencies": {