export type CustomTypeCheck<T> = (input: unknown) => input is T;
export type CustomCoerce<T> = (input: unknown) => T | null;
export type CustomTransform<T> = (input: T) => T;
export type CustomValidate<T> = (input: T) => boolean;
export interface IsCustomOptions<T> {
    typecheck: CustomTypeCheck<T>;
    validate?: CustomValidate<T>;
}
export interface CustomOptions<T> {
    typecheck: CustomTypeCheck<T>;
    coerce?: CustomCoerce<T>;
    transform?: CustomTransform<T>;
    validate?: CustomValidate<T>;
    defaultTypecheckError?: string;
    defaultValidateError?: string;
}