Vibe-coding an ESP32 version of Micro QuickJS

Conor O’Neill notes that Fabrice Bellard has released a tiny new JavaScript engine called Micro QuickJS. He says:

I looked at the small stack of ESP32 C6, H2 and S3 boards on my desk and thought “well this could be fun”. So I set about Vibe Coding an ESP32 port of MQuickJS.

I’m an unapologetic Vibe Coder and absolutely reject a lot of the hatred directed at it. I see it as a tool to get things done faster or enable me to do things I wouldn’t otherwise be able to do. Running MQuickJS on an ESP32 is definitely in the latter category.

Cursor with ChatGPT 5.1 Codex Max and Opus 4.5 got me a fully functional REPL running on an ESP32-S3 in less than 3 intermittent hours. Another hour to get LED Blinken-Lights working. Less than 30 minutes to switch from ESP32-S3 (240Mhz dual-core Xtensa LX7) to ESP32-C6 (160MHz single-core RISC-V) and ESP32-H2 (96Mhz single core RISC-V) microcontrollers.

Read more in the post here and see the project on GitHub.

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