/**
 * InterventionRequest Utils
 * @description Useful functions
 */
/**
 * Check if file contain webp extension
 * @param filename
 * @return boolean
 */
export declare function isWebp(filename: string): boolean;
/**
 * Check file extension
 * @param filename
 * @param extension
 * @return boolean
 */
export declare function checkFileExtension(filename: string, extension: string): boolean;
/**
 * Extract file extension
 * @param filename
 * @return string
 */
export declare function extractFileExtension(filename: string): string;
/**
 * Add extension to src URL
 * A src (URL) can be like /path/to/image.jpg or /path/to/image.jpg?param=value,
 * so we need to parse it properly.
 * A use case is when we want to add webp extension to an URL,
 * but we need to keep the original query parameters.
 * Ie: /path/to/image.jpg -> /path/to/image.jpg.webp
 *     /path/to/image.jpg?param=value -> /path/to/image.jpg.webp?param=value
 *
 * @param src
 * @param extension
 * @return string
 */
export declare function addExtensionToSrc(src: string, extension: string): string;