import type { Source } from '../source-elements/source';
import { SourceQueryElement } from './source-query-element';
import type { View } from '../view-elements/view';
import type { QueryElement } from '../types/query-element';
/**
 * An expression that adds a segment to a source or query.
 * This generates a `QueryArrow`, which either creates a new query
 * from scratch with the LHS as the source, or creates a new query
 * by adding a segment to the LHS (when it is already a query).
 * When this element is treated as a source, the resulting query is
 * wrapped in a `QuerySource` element.
 *
 * e.g. `flights -> by_carrier`
 */
export declare class SQArrow extends SourceQueryElement {
    readonly applyTo: SourceQueryElement;
    readonly operation: View;
    elementType: string;
    constructor(applyTo: SourceQueryElement, operation: View);
    getQuery(): QueryElement | undefined;
    getSource(): Source | undefined;
}