diff --git a/viewer/tsconfig.json b/viewer/tsconfig.json
index 46a05f27..5a1e9db3 100644
--- a/viewer/tsconfig.json
+++ b/viewer/tsconfig.json
@@ -12,6 +12,7 @@
         "noImplicitReturns": true,
         "noPropertyAccessFromIndexSignature": true,
         "noUncheckedIndexedAccess": true,
+        "noUncheckedSideEffectImports": true,
         "noUnusedLocals": true,
         "noUnusedParameters": true,
         "outDir": "../out/viewer",