resolve_dom_node.js

/**
 * Convenience method to resolve a component or a DOM node to a DOM node. If the
 * passed in `node` is a React component, the root DOM node of the component is
 * returned. If `node` is already a DOM node, that node is returned in itself.
 *
 * @param {Object} node A React component or a DOM node
 * @return {?Object} a DOM node
 */
var resolveDOMNode = (node) => {
  if (!node) {
    throw new Error(`
      Can't resolve DOM node for an undefined node. The component may not be
      initialized, or "Utils.findElement" returned undefined.
    `);
  }

  if (node.getDOMNode) {
    node = node.getDOMNode();
  }

  // As of React 0.11.0, components can render as null, which means that they
  // are still React components but `getDOMNode()` will return `null`.
  if (node === null) {
    return null;
  }

  if (!(node instanceof HTMLElement)) {
    throw new Error(`node is not an HTMLElement, got ${node.constructor.name}: ${node.toString()}`);
  }

  return node;
};
module.exports = resolveDOMNode;