Fix content and children props type

index.d.ts

@@ -4,7 +4,7 @@ import { Instance, Options, GroupOptions } from 'tippy.js'
 type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>
 
 export interface TippyProps extends Omit<Options, 'content'> {
-  content: React.ReactElement<any> | string
+  content: React.ReactChild | React.ReactChild[]
   children: React.ReactElement<any>
   onCreate?: (instance: Instance) => void
   /** @deprecated Use `visible` instead */

src/Tippy.js

@@ -126,16 +126,23 @@ function Tippy({
   )
 }
 
-Tippy.propTypes = {
-  content: PropTypes.oneOfType([PropTypes.string, PropTypes.element])
-    .isRequired,
-  children: PropTypes.element.isRequired,
-  onCreate: PropTypes.func,
-  isVisible: PropTypes.bool, // deprecated
-  isEnabled: PropTypes.bool, // deprecated
-  visible: PropTypes.bool,
-  enabled: PropTypes.bool,
-  className: PropTypes.string,
+if (process.env.NODE_ENV !== 'production') {
+  const ContentType = PropTypes.oneOfType([
+    PropTypes.number,
+    PropTypes.string,
+    PropTypes.element,
+  ])
+  Tippy.propTypes = {
+    content: PropTypes.oneOf([ContentType, PropTypes.arrayOf(ContentType)])
+      .isRequired,
+    children: PropTypes.element.isRequired,
+    onCreate: PropTypes.func,
+    isVisible: PropTypes.bool, // deprecated
+    isEnabled: PropTypes.bool, // deprecated
+    visible: PropTypes.bool,
+    enabled: PropTypes.bool,
+    className: PropTypes.string,
+  }
 }
 
 export default forwardRef(function TippyWrapper({ children, ...props }, ref) {

src/TippyGroup.js

@@ -21,6 +21,8 @@ export default function TippyGroup({ children, ...props }) {
   })
 }
 
-TippyGroup.propTypes = {
-  children: PropTypes.arrayOf(PropTypes.element).isRequired,
+if (process.env.NODE_ENV !== 'production') {
+  TippyGroup.propTypes = {
+    children: PropTypes.arrayOf(PropTypes.element).isRequired,
+  }
 }