Added Typescript/Mixin (#26256)

guide/english/typescript/mixin/index.md

@@ -0,0 +1,28 @@
+---
+title: Mixin
+---
+## Mixin
+
+In TypeScript, making a mixin is quite tricky due to its static typing. A good solution for mixin is to make a function receives a class and return a new class, which is similar to a higher-order function.
+
+```typescript
+type Constructor<T = {}> = new (...args: any[]) => T;
+
+class User {
+    constructor(name: string) {
+        this.name = name
+    }
+}
+
+function Loggable<ClassBase extends Constructor>(Base: ClassBase) {
+    return class extends Base {
+        constructor(...args: any[]) {
+            super(...args)
+            console.log(`arguments: ${args}`)
+        }
+    }
+}
+
+const LoggableUser = Loggable(User)
+const someUser = new LoggableUser('John Doe')
+```