import { AttributeTypes } from './interfaces/AttributeTypes';
import { IValue } from './interfaces/Expressions';
import { OperatorTypes } from './interfaces/OperatorTypes';
export declare class Expression {
    values: IValue[];
    private conditions;
    and(subQuery?: Expression): this;
    or(subQuery?: Expression): this;
    /**
     * @param {string} key
     * @param {OperatorTypes | any} param1 - Value of key or an expression operator
     * @param {any | undefined} param2 - Value of key
     */
    where(key: string, param1: OperatorTypes | any, param2?: any | undefined): this;
    whereBetween(key: string, firstValue: number, secondValue: number): this;
    whereIn(key: string, values: Array<string | number>): this;
    attributeExists(key: string): this;
    attributeNotExists(key: string): this;
    attributeType(key: string, type: AttributeTypes): this;
    beginsWith(key: string, beginStr: string): this;
    contains(key: string, valueSet: Array<string | number>): this;
    toString(isSub?: boolean): string;
}