export declare const extensions: {
    png: RegExp;
    svg: RegExp;
};
/**
 * Check image type
 * @param type - Image extension without dot.
 * @returns Image type is supported or not.
 */
export declare function isSupportedType(type: string): boolean;
/**
 * Check is "ico" or not.
 * @param filename - File name to check.
 * @returns Result of checking.
 */
export declare function isIco(filename: string): boolean;
/**
 * Check is "svg" or not.
 * @param filename - File name to check.
 * @returns Result of checking.
 */
export declare function isSvg(filename: string): boolean;
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