How to use the assert-js.instanceOf function in assert-js

constructor(gfxEngine, pathFinder)
    {
        Assert.instanceOf(gfxEngine, Engine);
        Assert.instanceOf(pathFinder, PathFinder);

        this._gfxEngine = gfxEngine;
        this._pathFinder = pathFinder;
        this._version = '1.0.0-DEV';
        this._resetState();
    }

constructor(position, ground, tileLayers, moveSpeedModifier = 0)
    {
        Assert.instanceOf(position, Position);
        Assert.instanceOf(ground, Item);
        Assert.instanceOf(tileLayers, TileLayers);
        Assert.integer(moveSpeedModifier);

        this._position = position;
        this._ground = ground;
        this._tileLayers = tileLayers;
        this._moveSpeedModifier = moveSpeedModifier;
        this._characters = new Map();
        this._monster = null;
    }

constructor(position, ground, tileLayers, moveSpeedModifier = 0)
    {
        Assert.instanceOf(position, Position);
        Assert.instanceOf(ground, Item);
        Assert.instanceOf(tileLayers, TileLayers);
        Assert.integer(moveSpeedModifier);

        this._position = position;
        this._ground = ground;
        this._tileLayers = tileLayers;
        this._moveSpeedModifier = moveSpeedModifier;
        this._characters = new Map();
        this._monster = null;
    }

constructor(character)
    {
        Assert.instanceOf(character, Character);

        this._character = character;
        this._incomeMessages = [];
    }

constructor(kernel, accounts, characters, incomeMessages, broadcaster, logger)
    {
        Assert.instanceOf(kernel, Kernel);
        Assert.instanceOf(accounts, Accounts);
        Assert.instanceOf(characters, Characters);
        Assert.instanceOf(incomeMessages, IncomeMessageQueue);
        Assert.instanceOf(broadcaster, Broadcaster);

        this._kernel = kernel;
        this._accounts = accounts;
        this._characters = characters;
        this._incomeMessages = incomeMessages;
        this._broadcaster = broadcaster;
        this._logger = logger;
    }