/**
 * Validate args for default-dispatch paths (e.g. `pr-shepherd [PR] [flags]`).
 * Returns false when an unexpected token is found; calls onError with the
 * offending arg so callers can print their own usage message.
 */
export declare function validateDefaultArgs(args: string[], flagsWithValues: ReadonlySet<string>, booleanFlags: ReadonlySet<string>, onError: (arg: string) => void): boolean;