How to define default settings for TinyMCE?

Question

JavaScript

We can define settings for TinyMCE on initialization:

tinymce.init({
        skin: false,
        selector: 'textarea.tinymce',
        height: 500,
        menubar: false,
        plugins: [
            'advlist autolink lists link image charmap print preview anchor textcolor',
            'searchreplace visualblocks code fullscreen',
            'insertdatetime media table contextmenu paste code help'
        ],
        toolbar: 'insert | undo redo |  formatselect | bold italic backcolor  | alignleft aligncenter alignright alignjustify | bullist numlist outdent indent | removeformat | help',
    });

I can’t find how to define the same settings in advance as default ones - by default, something like:

tinymce.defaults({
        skin: false,
        selector: 'textarea.tinymce',
        height: 500,
        menubar: false,
    });