diff --git a/rc-tree/tsconfig.json b/rc-tree/tsconfig.json
index 4e24118cf2..3af3996eaf 100644
--- a/rc-tree/tsconfig.json
+++ b/rc-tree/tsconfig.json
@@ -9,7 +9,7 @@
         "noImplicitThis": true,
         "noUnusedParameters": true,
         "noUnusedLocals": true,
-        "strictNullChecks": false,
+        "strictNullChecks": true,
         "baseUrl": "../",
         "jsx": "react",
         "typeRoots": [
diff --git a/rc-tree/tslint.json b/rc-tree/tslint.json
new file mode 100644
index 0000000000..377cc837d4
--- /dev/null
+++ b/rc-tree/tslint.json
@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }