{"id":73645,"library":"watt","title":"Watt","description":"Runtime for executing Rust procedural macros compiled as WebAssembly.","status":"active","version":"0.5.0","language":"rust","source_language":null,"source_url":"https://github.com/dtolnay/watt","tags":["proc-macro","wasm","runtime","macro"],"install":[{"cmd":"# Cargo.toml\n[dependencies]\nwatt = \"0.5.0\"","lang":"toml","label":"Cargo.toml"},{"cmd":"cargo add watt","lang":"bash","label":"cargo add"}],"dependencies":[],"imports":[{"symbol":"Jit","correct":"use watt::Jit;"}],"quickstart":{"code":"use watt::Jit;\n\nfn main() {\n    let jit = Jit::new(\"path/to/macro.wasm\").unwrap();\n    println!(\"JIT runtime initialized\");\n}","lang":"rust","description":"Initializes a JIT runtime from a WebAssembly macro."},"warnings":[{"fix":"Migrate to proc-macro2 and syn for procedural macros.","message":"Watt is no longer maintained; consider using proc-macro2 directly.","severity":"breaking","affected_versions":">=0.5.0"}],"env_vars":null,"search_vec":"'compil':8 'execut':4 'macro':7,13,16 'proc':12 'proc-macro':11 'procedur':6 'runtim':2,15 'rust':5 'wasm':14 'watt':1 'webassembl':10","created_at":"2026-06-17T18:53:20.642602+00:00","updated_at":"2026-06-17T18:53:20.642602+00:00","problems":[],"ecosystem":"crates","meta_description":null,"install_score":null,"quickstart_score":null,"quickstart_tag":null,"pypi_latest":null,"cli_name":null,"cli_version":null,"type":"library","homepage":"https://github.com/dtolnay/watt","github":"https://github.com/dtolnay/watt","docs":"https://docs.rs/watt/","changelog":null,"pypi":null,"npm":null,"openapi_spec":null,"status_page":null,"smithery":null,"categories":["build-tool"],"base_url":null,"auth_type":null,"provenance":{"verified_status":null,"verified_at":null,"last_verified":"2026-06-17","next_check":"2026-12-14","install_tag":null}}