[Vuejs]-Bootstrap-vue.js with laravel Unknown custom element: <b-alert> error

You will have to register the component as in Component registration

import { Alert } from 'bootstrap-vue/es/components';

components: { BAlert }

Since all html tags are turned into dashed by camelcase BAlert = '<b-alert>'

Alertenativly you can also use

components: { 'b-alert': BAlert }