Update Solution.ts

Author: yanglbme

solution/2600-2699/2666.Allow One Function Call/Solution.ts

@@ -1,6 +1,7 @@
-function once<T extends (...args: any[]) => any>(
-    fn: T,
-): (...args: Parameters<T>) => ReturnType<T> | undefined {
+type JSONValue = null | boolean | number | string | JSONValue[] | { [key: string]: JSONValue };
+type OnceFn = (...args: JSONValue[]) => JSONValue | undefined;
+
+function once(fn: Function): OnceFn {
     let called = false;
     return function (...args) {
         if (!called) {