Function mountLegacyApp

packages/react-devtools-shell/src/app/index.js:83–98

(App: () => React$Node)

}

function mountLegacyApp(App: () => React$Node) {
  // $FlowFixMe[prop-missing]: These are removed in 19.
  const {render, unmountComponentAtNode} = require('react-dom');

  function LegacyRender() {
    return createElement(App);
  }

  const container = createContainer();

  // $FlowFixMe[not-a-function]: These are removed in 19.
  render(createElement(LegacyRender), container);

  // $FlowFixMe: These are removed in 19.
  unmountFunctions.push(() => unmountComponentAtNode(container));
}

const shouldRenderLegacy = semver.lte(
  process.env.E2E_APP_REACT_VERSION,