fix(globalThis): Fix type of globalThis

Author: raon0211

src/_internal/globalThis.ts

@@ -1,10 +1,12 @@
+declare let global: typeof globalThis;
+
 // eslint-disable-next-line @typescript-eslint/naming-convention
-const globalThis_ =
+const globalThis_: typeof globalThis =
   (typeof globalThis === 'object' && globalThis) ||
   (typeof window === 'object' && window) ||
   (typeof self === 'object' && self) ||
   (typeof global === 'object' && global) ||
-  (function () {
+  (function (this: unknown) {
     return this;
   })() ||
   Function('return this')();