单例模式 装饰器

src/common/utils/sington.ts

@@ -0,0 +1,24 @@
+/** 单例模式 装饰器
+ * @param clz
+ * @returns
+ */
+export function singtonPattern<T extends new (...args: any[]) => any>(clz: T) {
+  // 添加判断，确保装饰器只能用于类
+  if (typeof clz !== 'function') {
+    throw new Error('单例模式装饰器只能修饰在类上')
+  }
+
+  let instance: InstanceType<T>
+  const proxy = new Proxy(clz, {
+    construct(target, args, newTarget) {
+      if (!instance) {
+        instance = Reflect.construct(target, args, newTarget)
+      }
+      return instance
+    }
+  })
+
+  proxy.prototype.constructor = proxy
+
+  return proxy
+}