Vue: prop sync modifier warning in vue v2.5.4

[rawbin-]

https://vuejs.org/v2/guide/components.html#sync-Modifier

prop with sync modifier used as v-model to control dialog visibility

vue.esm.js?65d7:574 [Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "visible"

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