From c558eaf35cb6dd29f5415dbd7763937fd3a2b802 Mon Sep 17 00:00:00 2001
From: EnixCoda <enixcoda@gmail.com>
Date: Fri, 3 Jun 2022 21:44:17 +0800
Subject: [PATCH] feat: is.not

---
 src/utils/is.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/utils/is.ts b/src/utils/is.ts
index b2ad89d..9ea15f4 100644
--- a/src/utils/is.ts
+++ b/src/utils/is.ts
@@ -2,6 +2,14 @@ export const is = {
   boolean: (d: unknown): d is boolean => typeof d === 'boolean',
   number: (d: unknown): d is number => typeof d === 'number',
   string: (d: unknown): d is string => typeof d === 'string',
+  not: {
+    undefined: <T>(d: T | undefined): d is T => d !== undefined,
+    null: <T>(d: T | null): d is T => d !== null,
+    true: <T>(d: T | true): d is T => d !== true,
+    false: <T>(d: T | false): d is T => d !== false,
+    number: <T>(d: T | number): d is T => typeof d !== 'number',
+    string: <T>(d: T | string): d is T => typeof d !== 'string',
+  },
   JSON: {
     object(d: unknown): d is JSONObject {
       return (typeof d === 'object' && d && !Array.isArray(d)) || false