From 4fa41bab0021f13250c7b643f77f3894cba21e3e Mon Sep 17 00:00:00 2001
From: "Xavier.Meng" <xavier.meng@fanruan.com>
Date: Sun, 1 Jan 2023 05:23:43 +0800
Subject: [PATCH] =?UTF-8?q?=E6=97=A0JIRA=20refactor(base/extend):=20?=
 =?UTF-8?q?=E5=AE=8C=E5=96=84=E6=B3=9B=E5=9E=8B?=
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---
 typescript/core/base.ts | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/typescript/core/base.ts b/typescript/core/base.ts
index 79dc317af..e681f2ac4 100644
--- a/typescript/core/base.ts
+++ b/typescript/core/base.ts
@@ -177,7 +177,8 @@ export interface _base {
 
     functions: (object: object) => string[];
 
-    extend: (object: object, ...sources: any[]) => object;
+    extend<T extends object>(object: T): T;
+    extend<T extends object, U extends object>(object: T, ...sources: U[]): T & UnionToIntersection<U>;
 
     defaults: (object: object, ...sources: any[]) => object;
 
@@ -399,3 +400,11 @@ type merge = {
 
     deepExtend(object: any, ...otherArgs: any[]): any;
 }
+
+type UnionToIntersection<Union> = (
+	Union extends unknown
+		? (x: Union) => void
+		: never
+) extends ((x: infer Intersection) => void)
+	? Intersection
+	: never;