GlobExtglobOperator

GlobExtglobOperator = "?" | "*" | "+" | "@" | "!"

Defined in: packages/format-glob/src/ast.ts:26

Which repetition an extglob group takes, spelled as the character that introduces it: ?(a|b) zero or one, *(a|b) zero or more, +(a|b) one or more, @(a|b) exactly one, !(a|b) anything the branches do not match.