make memoize arguments type weakmap

Author: saihaj

src/jsutils/memoize3.ts

@@ -2,9 +2,9 @@
  * Memoizes the provided three-argument function.
  */
 export default function memoize3<
-  A1 extends { } | ReadonlyArray<unknown>,
-  A2 extends { } | ReadonlyArray<unknown>,
-  A3 extends { } | ReadonlyArray<unknown>,
+  A1 extends WeakMap<{},ReadonlyArray<unknown>>,
+  A2 extends WeakMap<{},ReadonlyArray<unknown>>,
+  A3 extends WeakMap<{},ReadonlyArray<unknown>>,
   R extends unknown,
 >( fn: (a1: A1, a2: A2, a3: A3) => R): (a1: A1, a2: A2, a3: A3) => R {
   let cache0;