Function warnOnFunctionTypeImpl

packages/react-reconciler/src/ReactChildFiber.js:333–368

(returnFiber: Fiber, invalidChild: Function)

}

function warnOnFunctionTypeImpl(returnFiber: Fiber, invalidChild: Function) {
  if (__DEV__) {
    const parentName = getComponentNameFromFiber(returnFiber) || 'Component';

    if (ownerHasFunctionTypeWarning[parentName]) {
      return;
    }
    ownerHasFunctionTypeWarning[parentName] = true;

    const name = invalidChild.displayName || invalidChild.name || 'Component';

    if (returnFiber.tag === HostRoot) {
      console.error(
        'Functions are not valid as a React child. This may happen if ' +
          'you return %s instead of <%s /> from render. ' +
          'Or maybe you meant to call this function rather than return it.\n' +
          '  root.render(%s)',
        name,
        name,
        name,
      );
    } else {
      console.error(
        'Functions are not valid as a React child. This may happen if ' +
          'you return %s instead of <%s /> from render. ' +
          'Or maybe you meant to call this function rather than return it.\n' +
          '  <%s>{%s}</%s>',
        name,
        name,
        parentName,
        name,
        parentName,
      );
    }
  }
}

function warnOnFunctionType(returnFiber: Fiber, invalidChild: Function) {
  const debugTask = getCurrentDebugTask();