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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.
@allObjects
.espruino.com/modules/ESP8266WiFi_0v25.js was (initially) created for the combination of an original or PICO Espruino board - or similar - with no Wifi on-board and a (classic) ESP8266 (ESP-01). Espruino an ESP8266 are communicating with each other over serial USART. The version indicator 0v25 for the JS module on the Espruino side matches up with the version of the firmware on the ESP8266 - namely the AT commands and sequencing of the communication.
With the advent of Espruino 'directly' on ESP8266 ESP-01 (and ESP-12 or a-like), Esruino uses a different, dedicated - bult-in module. The Espruino firmware / binary - which is flashed onto the ESP8266 - includes the Wifi stack of ESP8266.