Issue implementing google autocomplete in vue.js

I'm trying to use google auto complete in vue.js with laravel but it is giving me error :

[Vue warn]: Error in mounted hook: "ReferenceError: google is not defined" 
found in
---> <VueGoogleAutocomplete> at /src/components/VueGoogleAutocomplete.vue
       <App> at /src/App.vue

         <Root>

here is the link to the code which i'm trying to implement:

https://codesandbox.io/s/nifty-bardeen-5eock

via Chebli Mohamed