Function resolveSingletonInstance

docs/index.js:17033–17051

(type, props, rootContainerInstance)

  return null;
}
function resolveSingletonInstance(type, props, rootContainerInstance) {
  props = getOwnerDocumentFromRootContainer(rootContainerInstance);
  switch (type) {
    case "html":
      type = props.documentElement;
      if (!type) throw Error(formatProdErrorMessage(452));
      return type;
    case "head":
      type = props.head;
      if (!type) throw Error(formatProdErrorMessage(453));
      return type;
    case "body":
      type = props.body;
      if (!type) throw Error(formatProdErrorMessage(454));
      return type;
    default:
      throw Error(formatProdErrorMessage(451));
  }
}
var preloadPropsMap = new Map(),
  preconnectsSet = new Set();
function getHoistableRoot(container) {