import { AnySchema } from './AnySchema';
import { SchemaMap } from './types';
import { ExtractObject, ConvertObject } from './convert-types';
export declare class ObjectSchema<TReq = true, TNull = false, TKeys = {}> extends AnySchema<TReq, TNull> {
    schema: string;
    private _keys;
    private _allowUnknown;
    constructor();
    keys<K extends SchemaMap>(schema: K): ObjectSchema<TReq, TNull, ConvertObject<ExtractObject<K>>>;
    unknown(): ObjectSchema<TReq, TNull, TKeys & {
        [key: string]: any;
    }>;
}