ast-grep vs Chromium

ast-grep is a free, open-source tool for structural code search, linting, and rewriting. It matches patterns against syntax-tree nodes, helping developers locate and change code across a codebase rather than searching plain text. Its CLI can preview and apply rewrites interactively, and scan configurable YAML rules with error, warning, info, or hint severity. Rules can combine pattern, kind, regex, relational, and composite conditions, and CLI commands help create and snapshot-test them. The project says it supports more than 20 languages and can load custom languages. JavaScript and WebAssembly APIs allow programmatic syntax-tree work; a browser playground offers a way to try patterns without local installation. Editor options include a VS Code extension and language-server setups, including for Vim and Neovim. The tool is free, has a web interface, and is distributed through package managers or built from source. Its FAQ notes that some advanced static-analysis information is unsupported, and one rule cannot target multiple languages at once.

Chromium is a free, open-source browser project and codebase for developers who build, study, and contribute to it. The project publishes source code, design and architecture documents, testing information, and contribution guidance. It develops the V8 JavaScript engine and Blink rendering engine. Its documented security approach includes sandboxing, Safe Browsing, defense in depth, and safe defaults, with a security team reviewing architecture and helping address bugs. Chromium source code is released under a permissive BSD license, and Google uses the project as the basis for Google Chrome. Build instructions cover Windows, Mac, Linux, iOS, and Android; download archives list Mac, Windows, Linux, and ChromiumOS. Builds are supplied on a best-effort basis from arbitrary revisions, may differ from user-facing Chrome releases, do not auto-update, and do not include symbols. Site Isolation can increase memory use and has stated Android limitations.