Function onlyChild

packages/react/src/ReactChildren.js:446–454

* Returns the first child in a collection of children and verifies that there * is only one child in the collection. * * See https://reactjs.org/docs/react-api.html#reactchildrenonly * * The current implementation of this function assumes that a single child gets * passed without a wrapper, bu

(children: T)

 * structure.
 */
function onlyChild<T>(children: T): T {
  if (!isValidElement(children)) {
    throw new Error(
      'React.Children.only expected to receive a single React element child.',
    );
  }

  return children;
}

export {
  forEachChildren as forEach,