sg

all

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

Examples (4)

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