style: add type for better understanding

Author: piquark6046

sources/src/index.ts

@@ -22,7 +22,7 @@ Win.Function.prototype.toString = new Proxy(Win.Function.prototype.toString, {
 Win.Function.prototype.apply = new Proxy(Win.Function.prototype.apply, {
   // eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
   apply(Target: typeof Function.prototype.apply, ThisArg: Function, Args: unknown[]) {
-    if (OrignalFunctionToString.call(ThisArg).includes(',inventoryId:')) {
+    if ((OrignalFunctionToString.call(ThisArg) as string).includes(',inventoryId:')) {
       throw new Error()
     }