Search and transform code patterns using AST structure with ast-grep.
npx skills add https://github.com/pbdeuchler/llm-plugins --skill howto-ast-grep
Please help me install this Agent Skill. Skill: howto-ast-grep Source: https://github.com/pbdeuchler/llm-plugins/tree/main/plugins/tooling/skills/howto-ast-grep Command: npx skills add https://github.com/pbdeuchler/llm-plugins --skill howto-ast-grep
ast-grep matches code by AST structure, not text, enabling precise searches and safe rewrites across languages.
Run sg with a language flag to search for an AST pattern in your codebase, for example sg run -p 'use$HOOK($$$)' -l typescript src/.
High-intent search queries and answers about installing and using this skill.
Code search and refactoring by AST structure uses abstract syntax trees to match precise code patterns, ignoring text formatting. This enables safe rewrites and anti-pattern detection across multi-language codebases using metavariables.
Static analysis with ast-grep applies across multiple programming languages, specifically supporting JavaScript, TypeScript, Python, Go, and Rust. Language-specific patterns ensure accurate code analysis for each unique syntax structure.
Function call detection and replacement during migrations is best handled using AST pattern matching with metavariables. Describing concrete AST shapes allows you to identify exact function structures and transform them safely.
The sg CLI is required to run AST pattern matching. You must execute it with a valid language flag and structural patterns describing the code shapes you want to search or transform within your project directory.
AST-based code analysis matches structural syntax shapes rather than literal text strings like grep. This prevents false positives from variable naming or formatting differences and enables precise structural transformations.
Complex matching rules for anti-pattern detection are defined using YAML rules and JSON output options. These configurations allow you to specify intricate structural patterns and metavariables for accurate codebase scanning.
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