Bun 1.0.9; Deno 1.38; service workers server WinterJS; deprecation of ESLint formatting rules; Test2

“Bun is a fast, all-in-one toolkit for running, building, testing, and debugging JavaScript and TypeScript, from a single file to a full-stack application.”

Version 1.0.9 is a minor upgrade. The last major upgrade was version 1.0 on 2023-09-08 (while ECMAScript News was on a break). The quote in the previous paragraph is from a blog post on this version which gives a good overview of Bun.

• deno doc improvements: The new deno doc --html command generates a static site with documentation for your project.
• Hot Module Replacement: The new --unstable-hmr flag will detect changes, reload your server, while preserving state, so you can stay productive.
Node.js compatibility improvements: It’s now even easier to use Deno when migrating from Node, now that you can use your npm package manager of choice. Install npm modules with npm and run it with Deno.
• Fast(est) JSX Transforms: This release includes JSX transforms about 7-20x faster with string concatenation instead of object allocation.
• deno run --env: built-in support for .env files.

“WinterJS is a JavaScript Service Workers server written in Rust, that uses the SpiderMonkey runtime to execute JavaScript (the same runtime that Firefox uses). We chose to follow the WinterCG specification to aim for maximum compatibility with other services such as Cloudflare Workers, Deno Deploy and Vercel (hence the name WinterJS).”

“WinterJS [can] be compiled to WebAssembly thanks to WASIX [...]”. That means it can be deployed on WebAssembly platforms.