export declare class SimpleExtensionMethods {
    static arrayDifference<T>(arr1: T[], arr2: T[]): T[];
    static arrayDifferenceSymmetrical<T>(arr1: T[], arr2: T[]): T[];
    static arrayIntersection<T>(arr1: T[], arr2: T[]): T[];
    static arrayPrepend<T>(arr: T[], value: T): T[];
    static arrayRemove<T>(arr: T[], value: T): T[];
    static arrayRemoveByIndex<T>(arr: T[], index: number): T[];
    static arrayUnion<T>(arr1: T[], arr2: T[]): T[];
    static arrayToObject(arr: any[], key: string): any;
    static convertBlobToBase64(blob: Blob): Promise<string>;
    static convertFileDataToBase64(fileData: Blob | number[], fileName: string): Promise<string>;
    static fileFromBase64(fileBase64String: string, fileName: string): File;
    static fileToBytesObject(file: File): Promise<any>;
    static fileToBlobObject(file: File): Promise<any>;
    static elementRemove(element: HTMLElement): void;
    static numberRound(number: any, decimals?: number): number;
    static objectChangese(oldObject: any, newObject: any): any;
    static objectClone(obj: any): any;
    static objectFilter<T>(obj: Object, filterFunction: (key: string, value: T) => boolean): Object;
    static stringToCapitalCase(str: string): string;
    static stringIsJson(str: string): boolean;
    static stringIsNumeric(str: string): boolean;
    static stringRandom(): string;
}