prepareUpdate.js

  prepareUpdate(
    domElement,
    type,
    oldProps,
    newProps,
    rootContainerInstance,
    hostContext
  ) {
    const propKeys = new Set(
      Object.keys(newProps).concat(
        Object.keys(oldProps)
      )
    ).values();
    const payload = [];
    for (let key of propKeys) {
      if (
        key !== 'children' && // text children are already handled
        oldProps[key] !== newProps[key]
      ) {
        payload.push({ [key]: newProps[key] })
      }
    }
    return payload;
  },