diff --git a/types/graphlib-dot/graphlib-dot-global-tests.ts b/types/graphlib-dot/graphlib-dot-global-tests.ts
new file mode 100644
index 0000000000..7c427f21da
--- /dev/null
+++ b/types/graphlib-dot/graphlib-dot-global-tests.ts
@@ -0,0 +1,6 @@
+// Global tests
+const graph = graphlibDot.read('digraph {node 1}');
+
+const graphs = graphlibDot.readMany('digraph { node1 }');
+
+const dotStr = graphlibDot.write(graph);
diff --git a/types/graphlib-dot/graphlib-dot-tests.ts b/types/graphlib-dot/graphlib-dot-tests.ts
index 5d88bd7d01..138b9fdfe7 100644
--- a/types/graphlib-dot/graphlib-dot-tests.ts
+++ b/types/graphlib-dot/graphlib-dot-tests.ts
@@ -2,15 +2,8 @@ import { Graph } from "graphlib";
 import { read, readMany, write } from 'graphlib-dot';
 
 // Module tests
-let graph: Graph = read('digraph {node 1}');
+const graph: Graph = read('digraph {node 1}');
 
-let graphs: Graph[] = readMany('digraph { node1 }');
+const graphs: Graph[] = readMany('digraph { node1 }');
 
-let dotStr: string = write(graph);
-
-// Global tests
-graph = graphlibDot.read('digraph {node 1}');
-
-graphs = graphlibDot.readMany('digraph { node1 }');
-
-dotStr = graphlibDot.write(graph);
+const dotStr: string = write(graph);
diff --git a/types/graphlib-dot/tsconfig.json b/types/graphlib-dot/tsconfig.json
index 74b1bf8906..06e72c02f2 100644
--- a/types/graphlib-dot/tsconfig.json
+++ b/types/graphlib-dot/tsconfig.json
@@ -18,6 +18,7 @@
     },
     "files": [
         "index.d.ts",
-        "graphlib-dot-tests.ts"
+        "graphlib-dot-tests.ts",
+        "graphlib-dot-global-tests.ts"
     ]
 }