export declare const INITIAL_BOUNDS: {
    width: number;
    height: number;
};
/**
 * Gets the extension of a file name.
 *
 * @param filename The file name.
 * @return  The extension of the file name.
 */
export declare function getExtension(filename?: string): string;
/**
 * Checks if a file is a video.
 *
 * @param filename The file name.
 * @return Whether the file is a video.
 */
export declare function isVideoType(filename?: string): boolean;
/**
 * Transforms a fraction value to a percentage value.
 *
 * @param fraction The fraction value.
 * @return A percentage value.
 */
export declare function fractionToPercentage(fraction: number): number;
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