class Scissor{

    constructor(me){
        this.me;
        this.situation;
    }
}

let Biggy = new Scissor(Game.creeps['Biggy']);

TypeError: Cannot read property 'Biggy' of undefined

class Scissor{

constructor(me){
    this.me = me; // Здесь ошибка = me
    this.situation;
}

let Biggy = new Scissor(Game.creeps['Biggy']);

SyntaxError: Unexpected strict mode reserved word