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import as Async component way with Vue.extend beforeRouteLeave throw error parentVal.concat is not a function #3004
3.0.3, also 3.1.3
Steps to reproduce
To see the error:
What is expected?
Get into the page as usually without the error.
What is actually happening?
When entered the page got the error:
vue-router.esm.js?8c4f:2079 TypeError: parentVal.concat is not a function
To make its work 3 ways: