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tree-sitter.tree-sitter/crates/language/README.md
Max Brunsfeld 0e2af0d8d1
Allow using Tree-sitter rust lib in multi-threaded web apps compiled to wasm32-unknown-unknown (#5851) 
* feat(wasm): make syntax trees sendable

* test(wasm): transfer trees across workers

* test(wasm): use JSON grammar for tree transfer

* test(wasm): edit trees across workers

* test(wasm): share dlmalloc with tree-sitter

* test(wasm): simplify worker tree exchange

* test(wasm): drive tree exchange from Rust

* test(wasm): split sendable-tree xtask

* test(wasm): generalize Rust web fixture

* test(wasm): exercise parallel Rust tree access

* fix(wasm): use Rust global allocator for C core

* test(wasm): use default Rust allocator

* feat(wasm): support external scanners in Rust web apps

* Simplify example further, add a readme

* Regenerate wasm-stdlib

* Fix wasm_stdlib check script

* Vendor the Wasm standard library subset

* Test Unicode Ruby scanner behavior in Wasm

* Make Wasm tree languages instance-aware

* Test multi-threaded use of queries in wasm32-unknown

* Refactor reference-counted language storage

* Check ABI version compat before loading rest of language

* 🎨 Remove redundant #ifdef block

* Reject unsupported Rust Wasm builds on 0.26
2026-08-14 17:05:42 -07:00

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Tree-sitter Language

This crate provides a LanguageFn type for grammars to create Language instances from a parser, without having to worry about the tree-sitter crate version not matching.

When targeting wasm32-unknown-unknown, this crate also provides the C headers needed to compile generated parsers and external scanners. The final tree-sitter Rust application supplies the corresponding libc-compatible implementations.