@gullerya/object-observer
object-observer utility provides simple means to (deeply) observe specified object/array changes; implemented via native Proxy; changes delivered in a synchronous way
on-change
Watch an object or array for changes
jobserve.js
A lightweight JavaScript library that allows developers to keep track of changes to JavaScript objects and/or DOM elements.
objix
A powerfull, high performance, lightweight library to injecs many usefull methods into the Object prototype to sugar many use cases working with common Javascript object.