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Ast-grep is a tool for code structural search, lint, and rewriting. More information:

  • Scan for possible queries using interactive mode:

sg scan --interactive

  • Rewrite code in the current directory using patterns:

sg run --pattern '{{foo}}' --rewrite '{{bar}}' --lang {{python}}

  • Visualize possible changes without applying them:

sg run --pattern '{{useState<number>($A)}}' --rewrite '{{useState($A)}}' --lang {{typescript}}

  • Output results as JSON, extract information using jq and interactively view it using jless:

sg run --pattern '{{Some($A)}}' --rewrite '{{None}}' --json | jq '{{.[].replacement}}' | jless