Function markRef

code/composition/public/app.js:9955–9961

(current, workInProgress)

  }

  function markRef(current, workInProgress) {
    var ref = workInProgress.ref;
    if (current === null && ref !== null || current !== null && current.ref !== ref) {
      // Schedule a Ref effect
      workInProgress.effectTag |= Ref;
    }
  }

  function updateFunctionalComponent(current, workInProgress) {
    var fn = workInProgress.type;