Add web dev style guide presubmit checks and --fix support.

script/brave_node.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+# Copyright (c) 2022 The Brave Authors. All rights reserved.
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at https://mozilla.org/MPL/2.0/.
+
+import subprocess
+import sys
+import os
+
+NODE_MODULES = os.path.join(os.path.dirname(__file__), '..', 'node_modules')
+
+
+def PathInNodeModules(*args):
+    return os.path.join(NODE_MODULES, *args)
+
+
+def RunNode(cmd_parts):
+    cmd = ['node'] + cmd_parts
+    process = subprocess.Popen(cmd,
+                               cwd=os.getcwd(),
+                               stdout=subprocess.PIPE,
+                               stderr=subprocess.PIPE,
+                               universal_newlines=True)
+    stdout, stderr = process.communicate()
+
+    if process.returncode != 0:
+        err = stderr if len(stderr) > 0 else stdout
+        raise RuntimeError('Command \'%s\' failed\n%s' % (' '.join(cmd), err))
+
+    return stdout
+
+
+if __name__ == '__main__':
+    RunNode(sys.argv[1:])