DefinitelyTyped/types/chance/chance-tests.ts

// Instantiation
var globalInstance: Chance.Chance = chance;
var createYourOwn = new Chance(Math.random);

// Basic usage
var randBool: boolean = chance.bool();

var birthday: Date = chance.birthday();
var birthdayStr: Date|string = chance.birthday({ string: true });

var strArr: string[] = chance.n(chance.string, 42);

var uniqInts: number[] = chance.unique(chance.integer, 99);

var currencyPair = chance.currency_pair();
var firstCurrency = currencyPair[0];
var secondCurrency = currencyPair[1];

// Mixins can be used with on-the-fly type declaration
declare namespace Chance {
    interface Chance {
        time(): string;
    }
}

chance.mixin({
    time: function () {
        var h = chance.hour({ twentyfour: true }),
            m = chance.minute();
        return `${h}:${m}`;
    }
});

var timeString: string = chance.time();

var chanceConstructedWithSeed100 = new Chance(100);
var chanceCalledWithSeed100 = Chance()