import duckdb from '@duckdb/node-bindings';
export declare class DuckDBValidity {
    private data;
    private readonly offset;
    private readonly itemCount;
    private constructor();
    static fromVector(vector: duckdb.Vector, itemCount: number): DuckDBValidity;
    itemValid(itemIndex: number): boolean;
    setItemValid(itemIndex: number, valid: boolean): void;
    flush(vector: duckdb.Vector): void;
    slice(offset: number, itemCount: number): DuckDBValidity;
}