Using treeize to generate JSON heirarchies

treeize.js

import Treeize from 'treeize'

const treeized = rs => {
    var authors = new Treeize();

    const seed = rs.map(r => ({
        name: [r.last_name, r.first_name].join(', '),
        'categories:type': r.category,
        'categories:titles:name': r.title
    }))

    authors.grow(seed);
    return authors.getData();
}