Spark elixir import from node_modules

I'm building a custom component for Spark and want to import a couple of node modules.

I have the two modules installed in the project ('vue-strap' and 'load-google-maps-api').

In my component, I'm able to import the load-google-maps-api no problem:

import loadGoogleMapsAPI from 'load-google-maps-api'  <----- works

but can't get vue-strap to build:

import typeahead from 'vue-strap/src/typeahead'  <----doesn't work

[Error: Cannot find module 'vueify' from '/web/alex/navsolo/node_modules/vue-strap']

I'm using the out-of-the-box gulp file:

elixir(function(mix) {
    mix.less('app.less')
       .browserify('app.js', null, null, { paths: 'vendor/laravel/spark/resources/assets/js' })
       .copy('node_modules/sweetalert/dist/sweetalert.min.js', 'public/js/sweetalert.min.js')
       .copy('node_modules/sweetalert/dist/sweetalert.css', 'public/css/sweetalert.css');
});

What am I missing? Can't explain why the first import works (from the node_modules dir) and not the latter...