Function shouldComponentUpdate

packages/nerv/src/memo.ts:7–16

(this: Component, nextProps)

export function memo (component: Function, propsAreEqual?: Function) {
  function shouldComponentUpdate (this: Component, nextProps): boolean {
    const prevRef = this.props.ref
    const nextRef = nextProps.ref
    if (prevRef !== nextRef) {
      Ref.detach(this.vnode, prevRef, this.dom)
      Ref.attach(this.vnode, nextRef, this.dom)
      return true
    }
    return isFunction(propsAreEqual) ? !propsAreEqual(this.props, nextProps) : !shallowEqual(this.props, nextProps)
  }

  function Memoed (this: Component, props) {
    this.shouldComponentUpdate = shouldComponentUpdate