add version check

Author: robertjarske

packages/core/src/hooks/useTransition.tsx

@@ -1,4 +1,5 @@
 import * as React from 'react'
+import { version as reactVersion } from 'react/package.json'
 import { useContext, useRef, useMemo } from 'react'
 import { Lookup, OneOrMore, UnknownProps } from '@react-spring/types'
 import {
@@ -436,6 +437,7 @@ export function useTransition(
           <elem.type
             {...elem.props}
             key={is.str(t.key) || is.num(t.key) ? t.key : t.ctrl.id}
+            ref={reactVersion < '19.0.0' ? elem.ref : elem.props.ref}
           />
         ) : (
           elem

tsconfig.json

@@ -26,6 +26,7 @@
     "allowSyntheticDefaultImports": true,
     "esModuleInterop": true,
     "skipLibCheck": true,
-    "strictNullChecks": true
+    "strictNullChecks": true,
+    "resolveJsonModule": true
   }
 }