Function forwardRef

packages/react/src/ReactForwardRef.js:12–83

(
  render: (
    props: Props,
    ref: React$RefSetter<React$ElementRef<ElementType>>,
  ) => React$Node,
)

import {REACT_FORWARD_REF_TYPE, REACT_MEMO_TYPE} from class="st">'shared/ReactSymbols';

export function forwardRef<Props, ElementType: React$ElementType>(
  render: (
    props: Props,
    ref: React$RefSetter<React$ElementRef<ElementType>>,
  ) => React$Node,
) {
  if (__DEV__) {
    if (render != null && render.$$typeof === REACT_MEMO_TYPE) {
      console.error(
        class="st">'forwardRef requires a render function but received a `memo` ' +
          class="st">'component. Instead of forwardRef(memo(...)), use ' +
          class="st">'memo(forwardRef(...)).',
      );
    } else if (typeof render !== class="st">'function') {
      console.error(
        class="st">'forwardRef requires a render function but was given %s.',
        render === null ? class="st">'null' : typeof render,
      );
    } else {
      if (render.length !== 0 && render.length !== 2) {
        console.error(
          class="st">'forwardRef render functions accept exactly two parameters: props and ref. %s',
          render.length === 1
            ? class="st">'Did you forget to use the ref parameter?'
            : class="st">'Any additional parameter will be undefined.',
        );
      }
    }

    if (render != null) {
      if (render.defaultProps != null) {
        console.error(
          class="st">'forwardRef render functions do not support defaultProps. ' +
            class="st">'Did you accidentally pass a React component?',
        );
      }
    }
  }

  const elementType = {
    $$typeof: REACT_FORWARD_REF_TYPE,
    render,
  };
  if (__DEV__) {
    let ownName;
    Object.defineProperty(elementType, class="st">'displayName', {
      enumerable: false,
      configurable: true,
      get: function () {
        return ownName;
      },
      set: function (name) {
        ownName = name;

        class="cm">// The inner component shouldn't inherit this display name in most cases,
        class="cm">// because the component may be used elsewhere.
        class="cm">// But it's nice for anonymous functions to inherit the name,
        class="cm">// so that our component-stack generation logic will display their frames.