Function createPortal

packages/react-reconciler/src/ReactPortal.js:15–33

(
  children: ReactNodeList,
  containerInfo: any,
  // TODO: figure out the API for cross-renderer implementation.
  implementation: any,
  key: ?string = null,
)

import type {ReactNodeList, ReactPortal} from 'shared/ReactTypes';

export function createPortal(
  children: ReactNodeList,
  containerInfo: any,
  // TODO: figure out the API for cross-renderer implementation.
  implementation: any,
  key: ?string = null,
): ReactPortal {
  if (__DEV__) {
    checkKeyStringCoercion(key);
  }
  return {
    // This tag allow us to uniquely identify this as a React Portal
    $$typeof: REACT_PORTAL_TYPE,
    key: key == null ? null : '' + key,
    children,
    containerInfo,
    implementation,
  };
}