--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/emsdk/scripts/create_release.py	Fri Jan 23 22:38:59 2026 -0800
@@ -0,0 +1,92 @@
+#!/usr/bin/env python3
+
+import argparse
+import json
+import os
+import re
+import subprocess
+import sys
+from collections import OrderedDict
+
+script_dir = os.path.dirname(os.path.abspath(__file__))
+root_dir = os.path.dirname(script_dir)
+sys.path.append(root_dir)
+
+import emsdk  # noqa
+
+
+def version_key(version_string):
+  parts = re.split('[.-]', version_string)
+  key = [[int(part) for part in parts[:3]], -len(parts), parts[3:]]
+  return key
+
+
+def main():
+  if subprocess.check_output(['git', 'status', '--porcelain'], cwd=root_dir).strip():
+    print('tree is not clean')
+    sys.exit(1)
+
+  parser = argparse.ArgumentParser()
+  parser.add_argument('-r', '--release-hash')
+  parser.add_argument('-a', '--asserts-hash')
+  parser.add_argument('-v', '--new-version')
+  parser.add_argument('--gh-action', action='store_true')
+  options = parser.parse_args()
+
+  release_info = emsdk.load_releases_info()
+  if options.new_version:
+    new_version = options.new_version
+  else:
+    new_version = version_key(release_info['aliases']['latest'])[0]
+    new_version[-1] += 1
+    new_version = '.'.join(str(part) for part in new_version)
+
+  asserts_hash = None
+  if options.release_hash:
+    new_hash = options.release_hash
+    asserts_hash = options.asserts_hash
+  else:
+    new_hash = emsdk.get_emscripten_releases_tot()
+
+  print('Creating new release: %s -> %s' % (new_version, new_hash))
+  release_info['releases'][new_version] = new_hash
+  if asserts_hash:
+    asserts_name = new_version + '-asserts'
+    release_info['releases'][asserts_name] = asserts_hash
+
+  releases = [(k, v) for k, v in release_info['releases'].items()]
+  releases.sort(key=lambda pair: version_key(pair[0]))
+
+  release_info['releases'] = OrderedDict(reversed(releases))
+  release_info['aliases']['latest'] = new_version
+
+  with open(os.path.join(root_dir, 'emscripten-releases-tags.json'), 'w') as f:
+    f.write(json.dumps(release_info, indent=2))
+    f.write('\n')
+
+  subprocess.check_call(
+    [sys.executable, os.path.join(script_dir, 'update_bazel_workspace.py')],
+    cwd=root_dir)
+
+  branch_name = 'version_' + new_version
+
+  if options.gh_action:  # For GitHub Actions workflows
+    with open(os.environ['GITHUB_ENV'], 'a') as f:
+      f.write(f'RELEASE_VERSION={new_version}')
+  else:  # Local use
+    # Create a new git branch
+    subprocess.check_call(['git', 'checkout', '-b', branch_name, 'origin/main'], cwd=root_dir)
+
+    # Create auto-generated changes to the new git branch
+    subprocess.check_call(['git', 'add', '-u', '.'], cwd=root_dir)
+    subprocess.check_call(['git', 'commit', '-m', new_version], cwd=root_dir)
+    print('New release created in branch: `%s`' % branch_name)
+
+    # Push new branch to origin
+    subprocess.check_call(['git', 'push', 'origin', branch_name], cwd=root_dir)
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())