From 568d300506b9f8456de980eb77235c63dfb884c1 Mon Sep 17 00:00:00 2001
From: Omar Rodriguez <oarodriguez.cs@gmail.com>
Date: Thu, 7 Mar 2024 22:08:04 -0800
Subject: [PATCH] Add isValid and isValidSync to ISchema interface

- Updates Lazy.isValidSync definition to serve as a type guard
---
 src/Lazy.ts  | 2 +-
 src/types.ts | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Lazy.ts b/src/Lazy.ts
index 41af84c60..7920c5488 100644
--- a/src/Lazy.ts
+++ b/src/Lazy.ts
@@ -136,7 +136,7 @@ class Lazy<T, TContext = AnyObject, TFlags extends Flags = any>
     return this._resolve(value, options).isValid(value, options);
   }
 
-  isValidSync(value: any, options?: ValidateOptions<TContext>) {
+  isValidSync(value: any, options?: ValidateOptions<TContext>): value is this['__outputType']  {
     return this._resolve(value, options).isValidSync(value, options);
   }
 
diff --git a/src/types.ts b/src/types.ts
index 4a04d59a0..3fb17cb9d 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -22,6 +22,8 @@ export interface ISchema<T, C = any, F extends Flags = any, D = any> {
   cast(value: any, options: CastOptionalityOptions<C>): T | null | undefined;
 
   validate(value: any, options?: ValidateOptions<C>): Promise<T>;
+  isValid(value: any, options?: ValidateOptions<C>): Promise<boolean>;
+  isValidSync(value: any, options?: ValidateOptions<C>): value is T;
 
   asNestedTest(config: NestedTestConfig): Test;