/// <reference types="validator" />
import _toBoolean from 'validator/lib/toBoolean';
import { IStringProps, TStringValidatorResult } from '../_types';
declare type TParameters = Parameters<typeof _toBoolean>;
export interface IToBooleanProps {
    /**
     * In strict mode only `1` and `true` return true.
     */
    strict?: TParameters[1];
}
/**
 * Convert the input string to a `boolean`. Everything except for `0`, `false` and `(empty string)` returns true.
 */
export declare const toBoolean: (props?: IToBooleanProps & Omit<IStringProps, 'message'>) => TStringValidatorResult;
export {};