A Language Server for WebAssembly Text Format (.wat files) written in Rust.
Hover, completions, signature help, go to definition, find references, and rename.
Supports WasmGC, Relaxed SIMD, Exception Handling, and Reference Types.
VS Code: Install from the Marketplace or Open VSX.
Other editors: Configure to launch wat-lsp-rust for .wat files.
| Package | Description |
|---|---|
packages/wat-lsp |
WASM build of the LSP for browser and Node.js (@emnudge/wat-lsp) |
packages/vscode-extension |
VS Code extension |
packages/playground |
Browser-based playground |
packages/docs |
Documentation site |
Requires tree-sitter-cli (npm install -g tree-sitter-cli).
# Generate parser (required first)
cd grammars/tree-sitter-wat && tree-sitter generate && cd ../..
# Build native LSP server
cargo build --release # outputs to target/release/wat-lsp-rust
# Build WASM module (for browser)
cd grammars/tree-sitter-wat && tree-sitter build --wasm && cd ../..
wasm-pack build --target web --features wasm --no-default-featuresMIT