interface ClassInfo {
    resolver?: (props: Record<string, any>) => Function;
}
interface PropertyInfo {
    type?: Function;
    indexed?: boolean;
    aliases?: string[];
}
declare class Builder<T> {
    /**
     * Creates new instance of `T` class.
     * @param props properties to pass to the constructor of the instance.
     * @returns new instance of `T`
     */
    static create<T>(props: Partial<T>): T;
    save(): Record<keyof T, any>;
    with(props: Partial<T>): T;
}
declare function Entity(info?: ClassInfo): ClassDecorator;
declare function Property(info?: PropertyInfo): PropertyDecorator;

declare function rgbFromHex(color: string): {
    r: number;
    g: number;
    b: number;
};
declare function rgbToHex(r: number, g: number, b: number): string;
declare function colorContrast(color: string): "black" | "white";
declare function colorTint(color: string, factor?: number): string;
declare function colorShade(color: string, factor?: number): string;

declare function deepEqual(a: any, b: any): boolean;

declare function ensuresNonNull<T>(value?: T, message?: string): value is T;
declare function ensuresNonNullArray<T>(value?: T[], message?: string): value is T[];
declare function ensuresNonNullString(value?: string, message?: string): value is string;
declare function ensures(condition: any, message?: string): asserts condition;

declare function deepCopy<T>(obj: T): T;

declare function epoch(): Date;
declare function addDays(date: Date, days: number): Date;
/** Gets current value of unix timestamp */
declare function timestamp(): number;
/**
 * Gets unix timestamp value of `date`
 * @param date the date.
 */
declare function toTimestamp(date: Date): number;
/**
 * Converts an unix timestamp to a Date object
 * @param time an unix timestamp
 */
declare function dateFromTimestamp(time: number): Date;
/**
 * Converts an unix timestamp to a date in the format 'day month hours mins'
 * @param time an unix timestamp.
 * @param locale target language locale tag.
 * @returns string representation of the date.
 */
declare function fullDate(time: number, locale?: string): string;
/**
 * Converts an unix timestamp to a date in the format 'day month'
 * @param time an unix timestamp.
 * @param locale target language locale tag.
 * @returns string representation of the date.
 */
declare function shortDate(time: number, locale?: string): string;
/**
 * Converts an unix timestamp to a date in the format 'hours mins'
 * @param time an unix timestamp.
 * @returns string representation of the date.
 */
declare function hours(time: number): string;
/**
 * Gets a value indicating whether the timestamp is today.
 * @param time an unix timestamp.
 */
declare function isToday(time: number): boolean;
/**
 * Gets a value indicating whether the given dates representes the same year, month and day.
 * @param d1 the first date.
 * @param d2 the second date.
 */
declare function compareDays(d1: Date, d2: Date): boolean;
declare function convertDate(time: number, format: Intl.DateTimeFormatOptions, locale?: string): string;
declare function weeksDiff(d1: Date, d2: Date): number;
declare function dateRangeOverlaps(a_start: Date, a_end: Date, b_start: Date, b_end: Date): boolean;

declare function isImage(extension: string): boolean;
declare function isPdf(extension: string): boolean;
declare function isWordDoc(extension: string): boolean;
declare function isText(extension: string): boolean;
declare function isExcelDoc(extension: string): boolean;
declare function isPowerPointDoc(extension: string): boolean;
/**
 * Gets the extension of the file (without the dot '.').
 * Throws an exception if the file is undefined.
 * @param file the file
 * @returns the extension of the file.
 */
declare function extensionOf(file: File | Blob): string;

declare function isNullOrEmpty(text: string): boolean;
declare function anyNullOrEmpty(...args: string[]): boolean;
declare const urlPattern: string;
declare function isURL(str: string): boolean;
declare function hashCode(str: string): number;

export { Builder, Entity, Property, addDays, anyNullOrEmpty, colorContrast, colorShade, colorTint, compareDays, convertDate, dateFromTimestamp, dateRangeOverlaps, deepCopy, deepEqual, ensures, ensuresNonNull, ensuresNonNullArray, ensuresNonNullString, epoch, extensionOf, fullDate, hashCode, hours, isExcelDoc, isImage, isNullOrEmpty, isPdf, isPowerPointDoc, isText, isToday, isURL, isWordDoc, rgbFromHex, rgbToHex, shortDate, timestamp, toTimestamp, urlPattern, weeksDiff };