Yes, realistically you need some kind of bridge. There's some software that can run on a Raspberry Pi that can act as a proxy - there's a little bit of info here: http://www.espruino.com/Puck.js+HTTP+Proxy
However, you can also connect an ESP8266 WiFi module or a GSM/LTE module directly to Puck.js and it can access the internet that way, using all the usual Espruino http & socket APIs.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Yes, realistically you need some kind of bridge. There's some software that can run on a Raspberry Pi that can act as a proxy - there's a little bit of info here: http://www.espruino.com/Puck.js+HTTP+Proxy
However, you can also connect an ESP8266 WiFi module or a GSM/LTE module directly to Puck.js and it can access the internet that way, using all the usual Espruino http & socket APIs.