export declare function normalizePath(path: string): string;
/**
 * Compare mime-types ignoring charset or other params (application/json;charset=UTF-8)
 * @param a
 * @param b
 */
export declare function isSameMime(a?: string, b?: string): boolean;
/**
 * Removes the mime-types params e.g. charset (application/json;charset=UTF-8))
 * Removes any prefixes, e.g. application/hal+json => application/json
 * Spec is type/subtype;param1=value or type/semantic+format;param1=value
 * @param mimeType mime type string or undefined
 */
export declare function normalizeMimeType(mimeType?: string): string | undefined;
export declare function unescapeServerVariables(str: string): string;
export declare function arrayMergeStrategy<T>(target: T[], source: T[]): T[];
export declare function isEmptyObject(obj: GenericObject): boolean;
export declare const cryptoLib: Crypto | undefined;
export declare function randString(len?: number): string;
/**
 * Returns base-64 encoded ASCII string from a stringified JSON object
 */
export declare function encodeState<T extends GenericObject = GenericObject>(params: T): string;
export declare function sha256(str: string): Promise<ArrayBuffer | undefined>;
export declare function base64UrlEncode(arrayBuff?: ArrayBuffer): string | undefined;