/**
 * Calculates the starting boundary index for virtualized content rendering.
 *
 * This function determines the first item that should be included in the viewport
 * during virtualized rendering. It uses binary search to find the earliest visible
 * position based on the current scroll offset, then subtracts an overscan amount
 * to pre-render additional items above the visible area.
 *
 * The result is constrained between minStart (typically representing pinned items that
 * must always be rendered) and maxStart (to prevent exceeding the bounds of available data).
 * This ensures we maintain the correct rendering boundaries regardless of scroll position.
 */
export declare function getBoundStart(positions: Uint32Array, offset: number, overscan: number, minStart: number, maxStart: number): number;