import { Expression } from "./Expression";
import { UnaryOperator } from "./UnaryOperator";
export declare class UnaryExpression extends Expression {
    get sortOrder(): number;
    readonly operator: UnaryOperator;
    readonly argument: Expression;
    constructor(operator: UnaryOperator, argument: Expression, source?: unknown);
    compareSortOrderSameType(b: UnaryExpression): number;
    toStringInternal(): string;
}