Vue components not loading

I was given this problematic codebase, where the Vue components aren't loading in.

Vue is mounting, but without any components.

This is a Laravel 5.7 app, using blade templates with some Vue added in.

This is the initial code:

Vue.use(BootstrapVue)
export function createApp() {
  const i18n = createLocales(window.locale)

  // Components
  Vue.component('sign-in-form', signInForm)
  Vue.component('sign-up-form', signUpForm)
  Vue.component('forgot-pass-form', forgotPassForm)
  // Vue.component('register-to-agency', RegisterToAgency)
  Vue.component('send-email-form', SendEmailForm)
  Vue.component('agency-service-categories', AgencyServiceCategories)
  Vue.component('dropdown-with-checkboxes', DropdownWithCheckboxes)
  Vue.component('lasi-coalition-agencies', LasiCoalitionAgencies)
  Vue.component('service-providers', ServiceProviders)
  Vue.component('service-provider', ServiceProvider)


  new Vue({
    i18n
  }).$mount('#app')

}

Any ideas help!

Thanks

via Chebli Mohamed