import duckdb from '@duckdb/node-bindings';
import { DuckDBUnionType } from '../DuckDBType';
import { DuckDBUnionValue } from '../values';
import { DuckDBVector } from './DuckDBVector';
import { DuckDBStructVector } from './DuckDBStructVector';
export declare class DuckDBUnionVector extends DuckDBVector<DuckDBUnionValue> {
    private readonly unionType;
    private readonly structVector;
    constructor(unionType: DuckDBUnionType, structVector: DuckDBStructVector);
    static fromRawVector(unionType: DuckDBUnionType, vector: duckdb.Vector, itemCount: number): DuckDBUnionVector;
    get type(): DuckDBUnionType;
    get itemCount(): number;
    getItem(itemIndex: number): DuckDBUnionValue | null;
    setItem(itemIndex: number, value: DuckDBUnionValue | null): void;
    flush(): void;
    slice(offset: number, length: number): DuckDBUnionVector;
}