import { Expression } from '../abstract/expression.js';
export type ArithmeticOperator = '+' | '-' | '*' | '/';
export declare class ArithmeticExpression extends Expression {
    items: ArithmeticExpressionItem[];
    constructor();
    append(op: ArithmeticOperator, expression: Expression): this;
    toString(): string;
}
export declare class ArithmeticExpressionItem {
    op: ArithmeticOperator;
    expression: Expression;
    constructor(o: ArithmeticExpressionItem);
}