ast-grep Code Search FAQs

Question 1

How do I find the correct 'kind' name for a code element?

Accepted Answer

You can use the included debug-query command to inspect the Concrete Syntax Tree (CST) of a code snippet, which reveals the exact names used by the parser for different code nodes.

Question 2

What is 'stopBy: end' in the rules?

Accepted Answer

It is a critical parameter for relational rules that ensures ast-grep continues searching through the entire code subtree rather than stopping at the first node it encounters.

Question 3

Can I test rules before running them on my whole project?

Accepted Answer

Yes, the skill provides a workflow for testing rules against small code snippets using inline CLI commands or temporary rule files to ensure accuracy before scanning the entire codebase.

Question 4

What makes ast-grep different from regular grep?

Accepted Answer

Unlike traditional grep which uses text strings, ast-grep understands the code's structure (AST), allowing it to find patterns like 'functions missing try-catch' regardless of formatting or whitespace.

Question 5

Which programming languages are supported?

Accepted Answer

This skill supports a wide range of popular languages including JavaScript, TypeScript, Python, Java, Go, Rust, and C++, leveraging the broad language support of the underlying ast-grep tool.

ast-grep Code Search

Key Features

Use Cases

ast-grep Code Search

Key Features

Use Cases