myjs Lets You Run JavaScript Inside Python Without Node or a Browser

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A new open-source tool called myjs brings a JavaScript interpreter directly into the Python ecosystem, allowing developers to run .js files and render HTML pages without needing Node.js or a browser. It can be installed via pip or pipx and supports DOM scripting, server-side rendering, and calling native C libraries through FFI. The tool includes an interactive REPL with tab completion, multi-line input, and persistent history, as well as a command-line interface for running or evaluating JS files. myjs is built on top of a Python port of the Acorn JavaScript parser and runs on domonic's DOM implementation. It supports most modern JavaScript features including classes, async/await, generators, and ES5-style prototypes, though Proxy and the with statement are not yet covered.

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Developer uses 31B AI model to rewrite its own system prompt and agent code

A developer has built a setup where Flash, a terminal-based coding agent, and its underlying model Flash Onyx are both developed from within the agent itself, with the model actively editing its own configuration files and CLI code. The 31B model runs on a hosted base, with its entire configuration stored as a 96 KB file containing only a system prompt and sampling settings rather than full model weights. Because the model can modify the prompt it obeys, the developer acknowledges the risk of the AI quietly loosening its own constraints and has introduced two safeguards: personally reviewing every prompt diff and a rule requiring the model to re-examine rather than simply agree when challenged. Several behavioral quirks, such as the model repeatedly opening replies with its own name, were caught only through extended hands-on use rather than formal benchmarks. Version 2.4 is already in development, with the first two changes flagged by the model about its own behavior, and both the agent and model are publicly available under an MIT license.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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