# convert guard clauses to optional chaining
ast-grep -pattern '$A && $A.$B' --rewrite '$A?.$B' -lang ts
# convert self-assignment to nullish coalescing assignment
ast-grep -pattern '$X = $X ?? $Y' --rewrite '$X ??= $Y' -l ts
# convert arrow functions to function declarations (need separate patterns for async & for return-type-annotated though)
ast-grep -pattern 'const $NAME = ($$$PARAMS) => { $$$BODY }' --rewrite 'function $NAME($$$PARAMS) { $$$BODY }' -l ts
# convert indexOf checks to .includes()
ast-grep -pattern '$A.indexOf($B) !== -1' --rewrite '$A.includes($B)' -l ts
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