/**
 * Calculates the scale factor for an image to fit inside a container
 * while preserving its aspect ratio.
 *
 * @param imageWidth - The width of the image.
 * @param imageHeight - The height of the image.
 * @param containerWidth - The width of the container.
 * @param containerHeight - The height of the container.
 * @returns The scale factor to apply to the image.
 */
export declare function calculateSpriteScale(imageWidth: number, imageHeight: number, containerWidth: number, containerHeight: number): number;