ESM Compiler

ESM Compiler is a Rust-based compiler for the esm.sh playground, leveraging swc for JavaScript/TypeScript/JSX transformation and lightningcss for CSS. Built as a WebAssembly module, it compiles modern frontend code into ESM-compatible output with import maps. Version 0.9.2 is the current stable release; it is actively developed as part of the esm.sh ecosystem. Key differentiators include its Wasm-first architecture, Rust performance, and tight integration with esm.sh's import map resolution, making it suitable for in-browser code transformation without a server.