Function getUnchangedComponents

docs/lib/react.js:9845–9879

(measurement)

}

function getUnchangedComponents(measurement) {
  // For a given reconcile, look at which components did not actually
  // render anything to the DOM and return a mapping of their ID to
  // the amount of time it took to render the entire subtree.
  var cleanComponents = {};
  var writes = measurement.writes;
  var dirtyComposites = {};
  Object.keys(writes).forEach(function (id) {
    writes[id].forEach(function (write) {
      // Root mounting (innerHTML set) is recorded with an ID of ''
      if (id !== '') {
        measurement.hierarchy[id].forEach(function (c) {
          return dirtyComposites[c] = true;
        });
      }
    });
  });
  var allIDs = _assign({}, measurement.exclusive, measurement.inclusive);

  for (var id in allIDs) {
    var isDirty = false;
    // See if any of the DOM operations applied to this component's subtree.
    if (dirtyComposites[id]) {
      isDirty = true;
    }
    // check if component newly created
    if (measurement.created[id]) {
      isDirty = true;
    }
    if (!isDirty && measurement.counts[id] > 0) {
      cleanComponents[id] = true;
    }
  }
  return cleanComponents;
}

var ReactDefaultPerfAnalysis = {
  getExclusiveSummary: getExclusiveSummary,