Function onlyChild

dash/deps/react@18.2.0.js:1217–1223

* 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

(children)

  function onlyChild(children) {
    if (!isValidElement(children)) {
      throw new Error('React.Children.only expected to receive a single React element child.');
    }

    return children;
  }

  function createContext(defaultValue) {
    // TODO: Second argument used to be an optional `calculateChangedBits`