interface IBulletItem {
    travel: number;
    param: string;
    speed: string;
    end: string;
    volume: string;
    effect1: number;
    bullet2: string;
    cd: number;
}

export class BulletItem {
    id: number;
    data: IBulletItem;

    constructor(id, data) {
        this.id = id;
        this.data = data;
    }
}