support react 19

.lintstagedrc.js

@@ -26,7 +26,7 @@ const sh_cd = (directory, command) => {
 
 module.exports = {
     // Python checks (run from root, using root venv)
-    "dash/*.py": (filenames) => [
+    "dash/**/*.py": (filenames) => [
         `${venvBin("python")} -m pylint --rcfile=.pylintrc ${filenames.join(
             " "
         )}`,

dash/_dash_renderer.py

@@ -3,8 +3,8 @@
 
 __version__ = "3.0.0"
 
-_available_react_versions = {"18.3.1", "18.2.0", "16.14.0"}
-_available_reactdom_versions = {"18.3.1", "18.2.0", "16.14.0"}
+_available_react_versions = {"18.3.1", "18.2.0", "19.2.0"}
+_available_reactdom_versions = {"18.3.1", "18.2.0", "19.2.0"}
 _js_dist_dependencies: List[Dict[str, Any]] = []  # to be set by _set_react_version
 
 
@@ -19,19 +19,51 @@ def _set_react_version(v_react, v_reactdom=None):
     assert v_react in _available_react_versions, react_err
     assert v_reactdom in _available_reactdom_versions, reactdom_err
 
+    # React 19+ removed UMD builds, use umd-react package instead
+    is_react19 = v_react.startswith("19.")
+    is_reactdom19 = v_reactdom.startswith("19.")
+
+    if is_react19:
+        react_prod_url = (
+            f"https://unpkg.com/umd-react@{v_react}/dist/react.production.min.js"
+        )
+        react_dev_url = (
+            f"https://unpkg.com/umd-react@{v_react}/dist/react.development.js"
+        )
+    else:
+        react_prod_url = (
+            f"https://unpkg.com/react@{v_react}/umd/react.production.min.js"
+        )
+        react_dev_url = f"https://unpkg.com/react@{v_react}/umd/react.development.js"
+
+    if is_reactdom19:
+        reactdom_prod_url = (
+            f"https://unpkg.com/umd-react@{v_reactdom}/dist/react-dom.production.min.js"
+        )
+        reactdom_dev_url = (
+            f"https://unpkg.com/umd-react@{v_reactdom}/dist/react-dom.development.js"
+        )
+    else:
+        reactdom_prod_url = (
+            f"https://unpkg.com/react-dom@{v_reactdom}/umd/react-dom.production.min.js"
+        )
+        reactdom_dev_url = (
+            f"https://unpkg.com/react-dom@{v_reactdom}/umd/react-dom.development.js"
+        )
+
     _js_dist_dependencies[:] = [
         {
             "external_url": {
                 "prod": [
                     "https://unpkg.com/@babel/polyfill@7.12.1/dist/polyfill.min.js",
-                    f"https://unpkg.com/react@{v_react}/umd/react.production.min.js",
-                    f"https://unpkg.com/react-dom@{v_reactdom}/umd/react-dom.production.min.js",
+                    react_prod_url,
+                    reactdom_prod_url,
                     "https://unpkg.com/prop-types@15.8.1/prop-types.min.js",
                 ],
                 "dev": [
                     "https://unpkg.com/@babel/polyfill@7.12.1/dist/polyfill.min.js",
-                    f"https://unpkg.com/react@{v_react}/umd/react.development.js",
-                    f"https://unpkg.com/react-dom@{v_reactdom}/umd/react-dom.development.js",
+                    react_dev_url,
+                    reactdom_dev_url,
                     "https://unpkg.com/prop-types@15.8.1/prop-types.js",
                 ],
             },

dash/dash-renderer/init.template

@@ -19,19 +19,51 @@ def _set_react_version(v_react, v_reactdom=None):
     assert v_react in _available_react_versions, react_err
     assert v_reactdom in _available_reactdom_versions, reactdom_err
 
+    # React 19+ removed UMD builds, use umd-react package instead
+    is_react19 = v_react.startswith("19.")
+    is_reactdom19 = v_reactdom.startswith("19.")
+
+    if is_react19:
+        react_prod_url = (
+            f"https://unpkg.com/umd-react@{v_react}/dist/react.production.min.js"
+        )
+        react_dev_url = (
+            f"https://unpkg.com/umd-react@{v_react}/dist/react.development.js"
+        )
+    else:
+        react_prod_url = (
+            f"https://unpkg.com/react@{v_react}/umd/react.production.min.js"
+        )
+        react_dev_url = f"https://unpkg.com/react@{v_react}/umd/react.development.js"
+
+    if is_reactdom19:
+        reactdom_prod_url = (
+            f"https://unpkg.com/umd-react@{v_reactdom}/dist/react-dom.production.min.js"
+        )
+        reactdom_dev_url = (
+            f"https://unpkg.com/umd-react@{v_reactdom}/dist/react-dom.development.js"
+        )
+    else:
+        reactdom_prod_url = (
+            f"https://unpkg.com/react-dom@{v_reactdom}/umd/react-dom.production.min.js"
+        )
+        reactdom_dev_url = (
+            f"https://unpkg.com/react-dom@{v_reactdom}/umd/react-dom.development.js"
+        )
+
     _js_dist_dependencies[:] = [
         {
             "external_url": {
                 "prod": [
                     "https://unpkg.com/@babel/polyfill@$polyfill/dist/polyfill.min.js",
-                    f"https://unpkg.com/react@{v_react}/umd/react.production.min.js",
-                    f"https://unpkg.com/react-dom@{v_reactdom}/umd/react-dom.production.min.js",
+                    react_prod_url,
+                    reactdom_prod_url,
                     "https://unpkg.com/prop-types@$proptypes/prop-types.min.js",
                 ],
                 "dev": [
                     "https://unpkg.com/@babel/polyfill@$polyfill/dist/polyfill.min.js",
-                    f"https://unpkg.com/react@{v_react}/umd/react.development.js",
-                    f"https://unpkg.com/react-dom@{v_reactdom}/umd/react-dom.development.js",
+                    react_dev_url,
+                    reactdom_dev_url,
                     "https://unpkg.com/prop-types@$proptypes/prop-types.js",
                 ],
             },

dash/development/build_process.py

@@ -143,7 +143,21 @@ def bundles(self, build=None):  # pylint:disable=too-many-locals
                 versions[f"extra_{name_squashed}_versions"] = f'"{extras_str}"'
 
                 for extra_version in extras:
-                    url = f"https://unpkg.com/{name}@{extra_version}/umd/{filename}"
+                    # React 19+ removed UMD builds, use umd-react package instead
+                    if name in ("react", "react-dom") and extra_version.startswith(
+                        "19."
+                    ):
+                        # Map filename to umd-react dist path
+                        if "production.min" in filename:
+                            umd_filename = f"{name}.production.min.js"
+                        elif "development" in filename:
+                            umd_filename = f"{name}.development.js"
+                        else:
+                            umd_filename = filename
+                        url = f"https://unpkg.com/umd-react@{extra_version}/dist/{umd_filename}"
+                    else:
+                        url = f"https://unpkg.com/{name}@{extra_version}/umd/{filename}"
+
                     res = requests.get(url)
                     extra_target = f"{name}@{extra_version}.{ext}"
                     extra_path = self._concat(self.deps_folder, extra_target)
@@ -169,7 +183,7 @@ def __init__(self):
         """dash-renderer's path is binding with the dash folder hierarchy."""
         extras = [
             "18.2.0",
-            "16.14.0",
+            "19.2.0",
         ]  # versions to include beyond what's in package.json
         super().__init__(
             self._concat(os.path.dirname(__file__), os.pardir, "dash-renderer"),