import { _decorator, Component, Node } from 'cc';
const { ccclass, property } = _decorator;

type SingletonConstructor<T> = {
    new (...args: any[]): T;
}

export class Singleton {
    private static instances: Map<Function, any> = new Map();

    private constructor() {}

    public static getInstance<T>(cls: SingletonConstructor<T>): T {
        if (!this.instances.has(cls)) {
            this.instances.set(cls, new cls());
        }
        return this.instances.get(cls);
    }
}