/**
 * Items drawn together in one call, in paint order. A change of blend or of
 * `key` closes the run, since a blend belongs to the pipeline and a key to
 * whatever else the draw shares. So does an item whose blend needs the
 * backdrop, which meets the frame on its own the way canvas composites it.
 */
export declare class DrawRun<T> {
    private readonly opaqueBackdrop;
    private readonly draw;
    private items;
    private blend;
    private key;
    constructor(opaqueBackdrop: boolean, draw: (items: T[], blend: string) => void);
    add(item: T, blend: string, key?: unknown): void;
    flush(): void;
}