JSIR is a high-level intermediate representation for JavaScript that preserves all information from the abstract syntax tree (AST) and supports high-fidelity round-trip conversions between source code, AST, and JSIR. It utilizes MLIR regions for representing control flow structures and is deployed in production at Google for code analysis and transformation use cases, with open-source availability on GitHub.

Ataraxy Labs' sem is a semantic version control CLI that provides entity-level diffs, blame, graph, and impact analysis for code across 16 programming languages using tree-sitter. Instead of traditional line changes, sem identifies specific functions or properties that were added, modified, or deleted in the codebase.