Types/FormItem (carbon-design-system#14899)

* refactor: migrate to ts

* Update packages/react/src/components/FormItem/FormItem.tsx

Co-authored-by: Guilherme Datilio Ribeiro <guilhermedatilio@gmail.com>

* Update packages/react/src/components/FormItem/FormItem.tsx

Co-authored-by: Guilherme Datilio Ribeiro <guilhermedatilio@gmail.com>

---------

Co-authored-by: Guilherme Datilio Ribeiro <guilhermedatilio@gmail.com>
Co-authored-by: Taylor Jones <tay1orjones@users.noreply.github.com>

packages/react/src/components/FormItem/FormItem.js → packages/react/src/components/FormItem/FormItem.tsx

@@ -10,7 +10,19 @@ import React from 'react';
 import classnames from 'classnames';
 import { usePrefix } from '../../internal/usePrefix';
 
-function FormItem({ className, children, ...rest }) {
+type FormItemProps = {
+ /**
+ * Provide content to be rendered in the form item
+ */
+ children?: React.ReactNode;
+
+ /**
+ * Provide a custom className to be applied to the containing node
+ */
+ className?: string;
+};
+
+function FormItem({ className, children, ...rest }: FormItemProps) {
  const prefix = usePrefix();
  const classNames = classnames(`${prefix}--form-item`, className);