chore(watch): use polyfill instead of object.is (#898)

Author: webfansplz

src/apis/watch.ts

@@ -11,6 +11,7 @@ import {
   isPlainObject,
   isSet,
   isMap,
+  isSame,
 } from '../utils'
 import { defineComponentInstance } from '../utils/helper'
 import { getVueConstructor } from '../runtimeContext'
@@ -346,7 +347,7 @@ function createWatcher(
     if (
       !deep &&
       isMultiSource &&
-      n.every((v: any, i: number) => Object.is(v, o[i]))
+      n.every((v: any, i: number) => isSame(v, o[i]))
     )
       return
     // cleanup before running cb again

src/utils/utils.ts

@@ -112,3 +112,15 @@ export function logError(err: Error, vm: Vue, info: string) {
     throw err
   }
 }
+
+/**
+ * Object.is polyfill
+ * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
+ * */
+export function isSame(value1: any, value2: any): boolean {
+  if (value1 === value2) {
+    return value1 !== 0 || 1 / value1 === 1 / value2
+  } else {
+    return value1 !== value1 && value2 !== value2
+  }
+}