diff --git a/.gitignore b/.gitignore
index 42ffcf79..cfda3195 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,3 +46,19 @@ logs/
 
 # Test coverage
 ui/coverage/
+
+# UI build artifacts (generated by tsc -b in pre-commit hooks)
+ui/src/lib/*.js
+ui/src/lib/*.d.ts
+ui/src/lib/*.js.map
+ui/src/lib/*.d.ts.map
+
+# Test mock build artifacts
+tests/mocks/*.js
+tests/mocks/*.d.ts
+tests/mocks/*.js.map
+tests/mocks/*.d.ts.map
+tests/mocks/fixtures/*.js
+tests/mocks/fixtures/*.d.ts
+tests/mocks/fixtures/*.js.map
+tests/mocks/fixtures/*.d.ts.map