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ast-grep provides a powerful alternative to traditional text-based search and edit tools by leveraging Abstract Syntax Trees (AST) for code manipulation. It allows for precise refactoring of complex code structures—such as function signatures and class definitions—regardless of whitespace, line breaks, or naming variations. By using structural patterns instead of exact string matches, it effectively eliminates the common 'old_string not unique' error, making it an essential tool for large-scale codebase migrations and systematic structural changes.
