import { BaseError } from 'make-error';
import { Constrained } from '../../core';
export declare class InvalidBooleanAsStringError extends BaseError {
    constructor();
}
export declare const booleanAsStringSymbol: unique symbol;
export type BooleanAsString = Constrained<typeof booleanAsStringSymbol, string>;
export declare const truthyBooleanStrings: string[];
export declare const falsyBooleanStrings: string[];
export declare function isBooleanAsString(input: unknown): input is BooleanAsString;
export declare function sanitizeBooleanFromString(input: unknown): boolean;