Function shouldUpdateComponent

web/main.js:4153–4196

(prevVNode, nextVNode, optimized)

  return res;
};
function shouldUpdateComponent(prevVNode, nextVNode, optimized) {
  const { props: prevProps, children: prevChildren, component } = prevVNode;
  const { props: nextProps, children: nextChildren, patchFlag } = nextVNode;
  const emits = component.emitsOptions;
  if (nextVNode.dirs || nextVNode.transition) {
    return true;
  }
  if (optimized && patchFlag >= 0) {
    if (patchFlag & 1024) {
      return true;
    }
    if (patchFlag & 16) {
      if (!prevProps) {
        return !!nextProps;
      }
      return hasPropsChanged(prevProps, nextProps, emits);
    } else if (patchFlag & 8) {
      const dynamicProps = nextVNode.dynamicProps;
      for (let i = 0; i < dynamicProps.length; i++) {
        const key = dynamicProps[i];
        if (hasPropValueChanged(nextProps, prevProps, key) && !isEmitListener(emits, key)) {
          return true;
        }
      }
    }
  } else {
    if (prevChildren || nextChildren) {
      if (!nextChildren || !nextChildren.$stable) {
        return true;
      }
    }
    if (prevProps === nextProps) {
      return false;
    }
    if (!prevProps) {
      return !!nextProps;
    }
    if (!nextProps) {
      return true;
    }
    return hasPropsChanged(prevProps, nextProps, emits);
  }
  return false;
}
function hasPropsChanged(prevProps, nextProps, emitsOptions) {
  const nextKeys = Object.keys(nextProps);
  if (nextKeys.length !== Object.keys(prevProps).length) {