interface String {
    toLower(): string;
    toUpper(): string;
    trim(): string;
    equals(str: string, ignoreCase?: boolean): boolean;
    startsWith(str: string, ignoreCase?: boolean): boolean;
    endsWith(str: string, ignoreCase?: boolean): boolean;
    contains(str: string, ignoreCase?: boolean): boolean;
    containsOnly(characters: string, ignoreCase?: boolean): boolean;
    left(length: number): string;
    right(length: number): string;
    shuffle(): string;
    repeat(iterations: number): string;
    replaceAll(target: string, replacement: string): string;
    padLeft(length: number, character: string): string;
    padRight(length: number, character: string): string;
    format(...args: any[]): string;
    toDate(): Date;
    toInt(): number;
    isInt(): boolean;
}
interface Number {
    between(min: number, max: number): boolean;
    addPercent(percent: number): number;
    percentageOf(total: number): number;
    in(numbers: Array<number>): boolean;
    floor(): number;
    ceil(): number;
    round(): number;
}
interface Date {
    isToday(): boolean;
    isSameDay(value: Date): boolean;
    addYears(years: number): Date;
    addMonths(months: number): Date;
    addDays(days: number): Date;
    addHours(hours: number): Date;
    addMinutes(minutes: number): Date;
    addSeconds(seconds: number): Date;
    date(): Date;
    format(format: string): string;
    parse(format: string): Date;
    copy(): Date;
    isLeapYear(): boolean;
}
interface Array<T> {
    contains(value: T): boolean;
    remove(value: T): void;
    addOrRemoveIfExists(value: T): void;
    pushIfNotExists(value: T): void;
    addRange(arr: Array<T>): Array<T>;
    clone(): Array<T>;
    shuffle(): void;
    getRandomItem(): T;
}