September 2025: Delivered cross-repo platform stabilization and performance improvements across tree-sitter, nixpkgs, emscripten, and related tooling. Key outcomes include CI optimization for ARM builds, robust wasi-sdk provisioning, automated and deterministic test fixtures, expanding WASM target support, and enhanced cross-building workflows. These changes reduce CI time, improve build reliability, enable broader platform support, and strengthen developer productivity.

Month: 2025-08 for tree-sitter/tree-sitter focused on delivering correctness, reliability, and developer experience improvements. Key features and bugs addressed include: - Documentation and correctness: Grammar DSL docs updated to require terminal reserved rules and ensure they exist within the grammar to prevent arbitrary tokens (commit 99d8b58868bc62cd3cbd4c9759732021d2995ad6). - CLI correctness: Grammar Rule Name Display Correctness fix to properly show rule names for rules with metadata by extracting the underlying rule (commit 1152bf4c9de862f822a49e30cebeaca26fec8fd1). - Robustness in parsing and queries: Improved error handling and query matching to correctly handle ERROR nodes, including anonymous ones, and to match regardless of position in the syntax tree (commits b7f36a13bad7c9b672022d21d741e034096dda4d and 8387101a6183e63b35ac034443a1d2c042dc70e6). - Debuggability and web build improvements: Source map improvements by embedding original sources into source maps for WASM builds and streamlining sourcemap processing for the web build (commits f2e71ec95c75f0e1815d8739a32f64f94d3768e7 and 94996b26e5014774eb4a482ad8365ba4117d068f). - Dependency optimization: Moved @types/emscripten to development dependencies to reduce production bundle size (commit f0cfaffd5e538d8a626ea9bef8f9d2cfaa1ba1f0). - WASI support flexibility: Added support for specifying a custom WASI SDK path via TREE_SITTER_WASI_SDK_PATH to accommodate non-standard installations (commit 22d658518b99c95e40841fcd41b115009a3c67f4).