sg

Ast-grep is a tool for code structural search, lint, and rewriting. More information: https://ast-grep.github.io/guide/introduction.html.

• 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