chore(api): add guardDefined

Author: sciborrudnicki

packages/type/src/public-api.ts

@@ -11,6 +11,7 @@ export {
   guardBigInt,
   guardBoolean,
   guardClass,
+  guardDefined,
   guardFunction,
   guardInstance,
   guardKey,
@@ -74,4 +75,4 @@ export {
 } from './is/not';
 
 // Types.
-export { Constructor, CycleHook, Func, Key, Primitive, Primitives, ResultCallback, Type, Types } from './type';
+export { Constructor, CycleHook, Defined, Func, Key, Primitive, Primitives, ResultCallback, Type, Types } from './type';