diff --git a/.deepsource.toml b/.deepsource.toml
new file mode 100644
index 000000000..852f1a7c0
--- /dev/null
+++ b/.deepsource.toml
@@ -0,0 +1,20 @@
+version = 1
+
+test_patterns = [
+    "**/*.test.ts",
+    "**/*.test.tsx"
+]
+
+exclude_patterns = ["/assets/**"]
+
+[[analyzers]]
+name = "javascript"
+enabled = true
+
+  [analyzers.meta]
+  environment = [
+    "nodejs",
+    "browser",
+    "jest"
+  ]
+  dialect = "typescript"
diff --git a/src/hooks/useInterval.ts b/src/hooks/useInterval.ts
index c4d7db5ea..cfda92fc7 100644
--- a/src/hooks/useInterval.ts
+++ b/src/hooks/useInterval.ts
@@ -18,7 +18,7 @@ export const useInterval = (callback, delay) => {
     }
 
     if (delay !== null) {
-      let id = setInterval(tick, delay);
+      const id = setInterval(tick, delay);
       return () => clearInterval(id);
     }
   }, [delay]);