fix(ui-motion,ui-alerts): capture child DOM via elementRef in Transition to avoid React 'ref is not a prop' warning

packages/ui-alerts/src/Alert/v1/index.tsx

@@ -99,6 +99,10 @@ class Alert extends Component<AlertProps, AlertState> {
 
   handleRef = (el: Element | null) => {
     this.ref = el
+    const { elementRef } = this.props
+    if (typeof elementRef === 'function') {
+      elementRef(el)
+    }
   }
 
   handleTimeout = () => {

packages/ui-alerts/src/Alert/v1/props.ts

@@ -109,6 +109,11 @@ type AlertOwnProps = {
    * An icon, or function that returns an icon. Setting it will override the variant's icon.
    */
   renderCustomIcon?: Renderable
+
+  /**
+   * provides a reference to the underlying html root element
+   */
+  elementRef?: (element: Element | null) => void
 }
 
 type PropKeys = keyof AlertOwnProps
@@ -137,7 +142,8 @@ const allowedProps: AllowedPropKeys = [
   'transition',
   'open',
   'hasShadow',
-  'renderCustomIcon'
+  'renderCustomIcon',
+  'elementRef'
 ]
 
 type AlertState = {

packages/ui-alerts/src/Alert/v2/index.tsx

@@ -98,6 +98,10 @@ class Alert extends Component<AlertProps, AlertState> {
 
   handleRef = (el: Element | null) => {
     this.ref = el
+    const { elementRef } = this.props
+    if (typeof elementRef === 'function') {
+      elementRef(el)
+    }
   }
 
   handleTimeout = () => {

packages/ui-alerts/src/Alert/v2/props.ts

@@ -110,6 +110,11 @@ type AlertOwnProps = {
    * An icon, or function that returns an icon. Setting it will override the variant's icon.
    */
   renderCustomIcon?: Renderable
+
+  /**
+   * provides a reference to the underlying html root element
+   */
+  elementRef?: (element: Element | null) => void
 }
 
 type PropKeys = keyof AlertOwnProps
@@ -138,7 +143,8 @@ const allowedProps: AllowedPropKeys = [
   'transition',
   'open',
   'hasShadow',
-  'renderCustomIcon'
+  'renderCustomIcon',
+  'elementRef'
 ]
 
 type AlertState = {

packages/ui-motion/src/Transition/BaseTransition/index.ts

@@ -22,13 +22,14 @@
  * SOFTWARE.
  */
 
-import { Component, ReactElement } from 'react'
+import { Component, ReactElement, ReactInstance } from 'react'
 
 import { getClassList, findDOMNode } from '@instructure/ui-dom-utils'
 import {
   ensureSingleChild,
   safeCloneElement
 } from '@instructure/ui-react-utils'
+import { createChainedFunction } from '@instructure/ui-utils'
 
 import { allowedProps } from './props.js'
 import type {
@@ -334,19 +335,43 @@ class BaseTransition extends Component<
   }
 
   renderChildren() {
-    return this.props.children
-      ? safeCloneElement(
-          ensureSingleChild(this.props.children) as ReactElement,
-          {
-            'aria-hidden': !this.props.in ? true : undefined,
-            ref: (el: React.ReactInstance | null) => {
-              const ref = (findDOMNode(el) as Element) || null
-
-              this.handleRef(ref)
-            }
+    if (!this.props.children) {
+      return null
+    }
+
+    const child = ensureSingleChild(this.props.children) as ReactElement
+
+    const elementOnlyRef = (el: ReactInstance | Element | null) => {
+      if (el instanceof Element) {
+        this.handleRef(el)
+      }
+    }
+
+    // `typeof type === 'object'` => forwardRef wrapper (withStyle-decorated InstUI components)
+    const refProps =
+      typeof child.type === 'object'
+        ? {
+            // chain so the child's own elementRef still fires instead of being overwritten
+            elementRef: createChainedFunction(
+              (child.props as { elementRef?: (el: Element | null) => void })
+                ?.elementRef,
+              this.handleRef
+            ),
+            // fallback for forwardRef children that expose their node via `ref`, not elementRef
+            ref: elementOnlyRef
           }
-        )
-      : null
+        : {
+            // for host el / plain class|fn: findDOMNode is the fallback
+            ref: (el: ReactInstance | Element | null) =>
+              this.handleRef(
+                el instanceof Element ? el : (findDOMNode(el) as Element) ?? null
+              )
+          }
+
+    return safeCloneElement(child, {
+      'aria-hidden': !this.props.in ? true : undefined,
+      ...refProps
+    })
   }
 
   render() {