diff --git a/.travis.yml b/.travis.yml
index d7697b851e..2613de27e6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,9 @@ before_script:
 - npm install -g bower gulp-cli@1
 - bower install
 - gulp lint-eslint
+- gulp generate-externs
+- gulp generate-typescript
+- git diff --exit-code
 script:
 - xvfb-run wct -l chrome
 - xvfb-run wct -l firefox