@directus/format-title/dist/utils/decamelize.js

Custom string formatter that converts any string into [Title Case](http://www.grammar-monster.com/lessons/capital_letters_title_case.htm)

export function decamelize(string) {
    return string
        .replace(/([a-z\d])([A-Z])/g, '$1_$2')
        .replace(/([A-Z]+)([A-Z][a-z\d]+)/g, '$1_$2')
        .toLowerCase();
}