refactor: keep single source of truth (vuejs#8334)

liximomo · aJean · commit bd114b2ab344 · 2020-08-19T17:10:06.000+08:00
diff --git a/src/core/instance/state.js b/src/core/instance/state.js
@@ -86,7 +86,7 @@ function initProps (vm: Component, propsOptions: Object) {
         )
       }
       defineReactive(props, key, value, () => {
-        if (vm.$parent && !isUpdatingChildComponent) {
+        if (!isRoot && !isUpdatingChildComponent) {
           warn(
             `Avoid mutating a prop directly since the value will be ` +
             `overwritten whenever the parent component re-renders. ` +

Original file line number	Diff line number	Diff line change
`@@ -86,7 +86,7 @@ function initProps (vm: Component, propsOptions: Object) {`
`86`	`86`	`)`
`87`	`87`	`}`
`88`	`88`	`defineReactive(props, key, value, () => {`
`89`		`- if (vm.$parent && !isUpdatingChildComponent) {`
	`89`	`+ if (!isRoot && !isUpdatingChildComponent) {`
`90`	`90`	`warn(`
`91`	`91`	`Avoid mutating a prop directly since the value will be ` +
`92`	`92`	`overwritten whenever the parent component re-renders. ` +