export function flattenError(error: $ZodError, mapper = (issue: $ZodIssue) => issue.message) {}

export function treeifyError<T>(error: $ZodError, _mapper?: any) {
  const mapper: (issue: $ZodIssue) => any =
    _mapper ||
    function (issue: $ZodIssue) {
      return issue.message;
    };
  // ...
}

export function formatError<T>(error: $ZodError, _mapper?: any) {
  const mapper: (issue: $ZodIssue) => any =
    _mapper ||
    function (issue: $ZodIssue) {
      return issue.message;
    };
  // ...
}

export function flattenError<T, U>(error: $ZodError<T>, mapper = (issue: $ZodIssue) => issue.message as U) {}
export function treeifyError<T, U>(error: $ZodError<T>, mapper = (issue: $ZodIssue) => issue.message as U) {}
export function formatError<T, U>(error: $ZodError<T>, mapper = (issue: $ZodIssue) => issue.message as U) {}