diff --git a/.travis.yml b/.travis.yml
index d8101e571..a961ba23c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -86,6 +86,11 @@ jobs:
       after_success:
         - travis_retry curl -s --connect-timeout 30 --fail https://codecov.io/bash | bash -s -- -F ui
 
+    - stage: Lint
+      name: Check for non-typescript UI components
+      if: (repo = prymitive/karma AND type != pull_request) OR (fork = true AND type = pull_request)
+      script: make -C ui lint-typescript
+
     - stage: Lint
       name: Lint git commit
       if: (repo = prymitive/karma AND type != pull_request) OR (fork = true AND type = pull_request)
diff --git a/ui/Makefile b/ui/Makefile
index 61f0431c7..b98c62c60 100644
--- a/ui/Makefile
+++ b/ui/Makefile
@@ -41,6 +41,11 @@ lint-docs: node_modules/markdownlint-cli/markdownlint.js
 lint-deps: node_modules/depcheck/bin/depcheck.js
 	node_modules/depcheck/bin/depcheck.js $(CURDIR)
 
+.PHONY: lint-typescript
+lint-typescript:
+	@$(eval JSFILES := $(shell find $(CURDIR)/src/Components -name \*.js -not -name \*.test.js  -not -name \*.stories.js))
+	@if [ "$(JSFILES)" != "" ]; then echo "$(JSFILES)" | tr " " "\n"; exit 1 ; fi
+
 .PHONY: format
 format: node_modules/prettier/bin-prettier.js
 	node_modules/prettier/bin-prettier.js --write 'src/**/*.js' 'src/**/*.ts' 'src/**/*.tsx'