Method constructor

contextKeyExpr/src/contributes.ts:15–20

()

    private readonly _config: Config;
    private readonly _contexts: Contexts;
    constructor() {
        // 缓存所有配置项
        this._config = new Config();
        // 缓存所有作用域
        this._contexts = new Contexts();
    }

    // 深度克隆配置项
    private _cloneContribute(confg: Config) {