Use env variables on JS on Laravel 8

According to the documentation you can pass env vars only by adding a prefix to a variable on you .env file

MIX_PUSHER_APP_KEY="${PUSHER_APP_KEY}"
MIX_PUSHER_APP_CLUSTER="${PUSHER_APP_CLUSTER}"

Then you can use that variable on your JS:

process.env.MIX_PUSHER_APP_KEY

Here is the link to the official documentation: Link