export type VirtualItem = {
    index: number;
    start: number;
    size: number;
    end: number;
    key: string;
};
export type VirtualizerOptions = {
    count: number;
    /**
     * Per-item size. Pass a number for a uniform layout (fast path) or a
     * function for variable sizing - the virtualizer will build cumulative
     * offsets and use binary lookup to find the visible window. The function
     * receives the item index and must return its pixel size.
     */
    estimateSize: number | ((index: number) => number);
    overscan?: number;
    viewportHeight: number;
    scrollOffset?: number;
};
export type VirtualizerState = {
    items: Array<VirtualItem>;
    totalSize: number;
    startIndex: number;
    endIndex: number;
    scrollOffset: number;
    viewportHeight: number;
};