interface PluginManagerInterface {
    _plugins: {
        [name: string]: {
            [status: string]: boolean
        }
    }
}

class PluginManager implements PluginManagerInterface {

    _plugins: {
        [key: string]: {
            [status: string]: boolean
        }
    }

    constructor() {
        this._plugins = {};
    }

    // ...code
}