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You should not use window globals to pass around your configuration. You should set up a route in Laravel and make an ajax call with your Vue.js application to get your configuration for the specific user.
Something like Axios can help with your ajax calls:
https://github.com/mzabriskie/axios
Laracasts has plenty of Vue.js material including how to work this into Vue.js.
To generate a json response you can use:
Source:stackexchange.com