fiber.js

//NB: ALL DOM nodes have their corresponding fibers in our new implementation
// most of this properties will make sense once we begin using them
let fiber = {
  tag: HOST_COMPONENT, // we can have either host of class component
  type: "input",
  parent: parentFiber, // the parentNode’s fiber
  child: childFiber, // the childNode’s fiber if it has any
  sibling: null, // the element that is in the same tree level as this input
  alternate: currentFiber, // the fiber that has been rendered on the dom. Will be null if its on initial render
  stateNode: document.createElement(“div”),
  props: { children: [], id: "image", type: "text"}, 
  effectTag: PLACEMENT,// can either be PLACEMENT | DELETION | UPDATe depending on the dom operation to be done
  effects: [] // this array will contain fibers of its childComponent
};