setPath.js

const setPath = (value, path, json) => {
    // We reached the end, return the value as a leaf
    if (!path.length) return value

    // Figure out if we are going down an array or object
    const isArrayMatch = path[0].match(/^\[(\d+)\]$/)
    const name = isArrayMatch ? isArrayMatch[1] : path[0]

    // Add the value to our json recursivly
    json = json || (isArrayMatch ? [] : {})
    json[name] = setPath(value, path.slice(1), json[name])
    return json
}

const inflateTreeArray = (prop, treeArray) => {
    return treeArray.reduce(
        (tree, node) => setPath(node[prop], node.path.split('.'), tree),
        {}
    )
}