Espruino is a JavaScript interpreter for microcontrollers. It is designed for devices with as little as 128kB Flash and 8kB RAM.
Before anyone says that an ESP32 isn't actually a microcontroller let me just point out that it doesn't really matter. A few years ago a board with an ATmega 2560, lets say an Arduino, would cost around 30€, today you can get ESP32 boards with WiFi and way better performance for 3€ making the Arduino 2560 mostly useless / not cost effective.
In just 5 years with all those new RISC and ARM chips will most like triple their performance and take over what is now done by high end AVR and PIC microcontrollers. Costs will go even further into cents and microcontrollers as we know them will become irrelevant. With the extra performance JS will become the most popular language simply because developer time is more expensive than hardware.
20 years? Ahahah
https://github.com/espruino/Espruino
Before anyone says that an ESP32 isn't actually a microcontroller let me just point out that it doesn't really matter. A few years ago a board with an ATmega 2560, lets say an Arduino, would cost around 30€, today you can get ESP32 boards with WiFi and way better performance for 3€ making the Arduino 2560 mostly useless / not cost effective.
In just 5 years with all those new RISC and ARM chips will most like triple their performance and take over what is now done by high end AVR and PIC microcontrollers. Costs will go even further into cents and microcontrollers as we know them will become irrelevant. With the extra performance JS will become the most popular language simply because developer time is more expensive than hardware.