From 08d7738f6810e7f22653224d6b2c40a41f2ce31f Mon Sep 17 00:00:00 2001
From: xingyu <xingyu4j@vip.qq.com>
Date: Sat, 10 Jun 2023 12:17:22 +0800
Subject: [PATCH] fix(deepMerge): the default merge strategy

---
 src/utils/index.ts | 55 +++++++++++++++++++++++++++++++++++-----------
 1 file changed, 42 insertions(+), 13 deletions(-)

diff --git a/src/utils/index.ts b/src/utils/index.ts
index 58b5a38..9726cfa 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -1,7 +1,7 @@
 import type { App, Component } from 'vue'
 import type { RouteLocationNormalized, RouteRecordNormalized } from 'vue-router'
 
-import { cloneDeep, mergeWith, uniq } from 'lodash-es'
+import { intersectionWith, isEqual, mergeWith, unionWith } from 'lodash-es'
 import { unref } from 'vue'
 import { isArray, isObject } from '@/utils/is'
 
@@ -34,21 +34,50 @@ export function setObjToUrlParams(baseUrl: string, obj: any): string {
 }
 
 /**
- * 递归合并两个对象。
  * Recursively merge two objects.
- * @param target 目标对象，合并后结果存放于此。The target object to merge into.
- * @param source 要合并的源对象。The source object to merge from.
- * @returns 合并后的对象。The merged object.
+ * 递归合并两个对象。
+ *
+ * @param source The source object to merge from. 要合并的源对象。
+ * @param target The target object to merge into. 目标对象，合并后结果存放于此。
+ * @param mergeArrays How to merge arrays. Default is "replace".
+ *        如何合并数组。默认为replace。
+ *        - "union": Union the arrays. 对数组执行并集操作。
+ *        - "intersection": Intersect the arrays. 对数组执行交集操作。
+ *        - "concat": Concatenate the arrays. 连接数组。
+ *        - "replace": Replace the source array with the target array. 用目标数组替换源数组。
+ * @returns The merged object. 合并后的对象。
  */
-export function deepMerge<T extends object | null | undefined, U extends object | null | undefined>(target: T, source: U): T & U {
-  return mergeWith(cloneDeep(target), source, (objValue, srcValue) => {
-    if (isObject(objValue) && isObject(srcValue)) {
-      return mergeWith(cloneDeep(objValue), srcValue, (prevValue, nextValue) => {
-        // 如果是数组，合并数组(去重) If it is an array, merge the array (remove duplicates)
-        return isArray(prevValue) ? uniq(prevValue, nextValue) : undefined
-      })
+export function deepMerge<T extends object | null | undefined, U extends object | null | undefined>(
+  source: T,
+  target: U,
+  mergeArrays: 'union' | 'intersection' | 'concat' | 'replace' = 'replace'
+): T & U {
+  if (!target) {
+    return source as T & U
+  }
+  if (!source) {
+    return target as T & U
+  }
+  if (isArray(target) && isArray(source)) {
+    switch (mergeArrays) {
+      case 'union':
+        return unionWith(target, source, isEqual) as T & U
+      case 'intersection':
+        return intersectionWith(target, source, isEqual) as T & U
+      case 'concat':
+        return target.concat(source) as T & U
+      case 'replace':
+        return source as T & U
+      default:
+        throw new Error(`Unknown merge array strategy: ${mergeArrays}`)
     }
-  })
+  }
+  if (isObject(target) && isObject(source)) {
+    return mergeWith({}, target, source, (targetValue, sourceValue) => {
+      return deepMerge(targetValue, sourceValue, mergeArrays)
+    }) as T & U
+  }
+  return source as T & U
 }
 
 export function openWindow(url: string, opt?: { target?: TargetContext | string; noopener?: boolean; noreferrer?: boolean }) {