Model.js

class Model {
    constructor(tree, path) {
        this.path = path ? path.split(".") : []
        this.tree = tree ? tree : {}
        this.changes = []
    }
    get(path) {
        return this.path.concat(path.split(".")).reduce((o,k) => o && o[k], this.tree)
    }
    set(path, value) {
        const keys = this.path.concat(path.split("."))
        keys.reduce((o,k,i,keys) => keys.length-1===i ? o[k] = value : (o[k]=o[k]||{}), this.tree)
        return this.changes.push({
            root: this.path,
            path: keys,
            args: [value]
        })
    }
}