index.js
function(){
        Object.keys(this.windows).forEach(key => {
            let window = this.windows[key];
            window.close();
        });
    }
function(){
        Object.keys(this.windows).forEach(key => {
            let window = this.windows[key];
            window.close();
        });
    }
function ( ) { Object . keys ( this . windows ) . forEach ( key => { let window = this . windows [ key ] ; window . close ( ) ; } ) ; }
Close all windows created by this module
Close all windows created by this module