Show all block categories

Hi all, I am using the following bit of code to collapse all the block categories, what would the code be to expand them all?

const categories = editor.BlockManager.getCategories();
categories.each(category => {
	category.set('open', false).on('change:open', opened => {
		opened.get('open') && categories.each(category => {
            category !== opened && category.set('open', false)
        })
	})
})