/**
 * Calculates scroll interval based on distance from viewport edge.
 * Uses logarithmic interpolation for natural feel (fast drop-off near edge, slower further out).
 *
 * @param {number} distance Distance from viewport edge in pixels.
 * @param {{ min: number, max: number }} intervalRange Min/max interval range in milliseconds.
 * @param {number} rampDistance Distance at which interval reaches minimum.
 * @param {number} [logScale] Logarithmic scale factor for natural feel.
 * @returns {number} Interval in milliseconds.
 */
export declare function calculateInterval(distance: number, intervalRange: {
    min: number;
    max: number;
}, rampDistance: number, logScale?: number): number;