basilisk-zed

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Zed editor extension for Basilisk — WASM-based Python type checking and language server integration.

Basilisk is the only Python type checker scoring 100% on the official python/typing conformance suite — and the fastest we've measured. A complete, open-source Python dev environment in Rust: type checker, language server, debugger, profiler, plus VS Code, Cursor, Zed & Neovim extensions. Strict by default.

Role in Basilisk

This is the Zed editor integration. It is a native Zed extension compiled to WASM that connects the Basilisk language server to Zed, providing real-time diagnostics, hover, go-to-definition, code actions, and debugging via DAP.

Key concepts

• WASM extension — compiled as a cdylib crate targeting wasm32-wasip1, loaded natively by Zed.
• zed_extension_api — uses Zed's official extension API for language server lifecycle management.
• basilisk-common — shares diagnostic codes and constants with the rest of the Basilisk workspace (also WASM-compatible).
• Tree-sitter grammars — provides Python syntax highlighting via tree-sitter.
• DAP debugging — supports the Debug Adapter Protocol for integrated Python debugging.

Building

make package-zed

Dependencies

Crate	Purpose
zed_extension_api	Zed extension API
basilisk-common	Shared constants and types

Status

Phase 2 — extension structure complete, connecting to the Basilisk LSP.

License

MIT.