--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/emsdk/scripts/update_bazel_workspace.py	Thu Jan 22 21:23:17 2026 -0800
@@ -0,0 +1,88 @@
+#!/usr/bin/env python3
+# This script will update emsdk/bazel/revisions.bzl to the latest version of
+# emscripten. It reads emsdk/emscripten-releases-tags.json to get the latest
+# version number. Then, it downloads the prebuilts for that version and computes
+# the sha256sum for the archive. It then puts all this information into the
+# emsdk/bazel/revisions.bzl file.
+
+import hashlib
+import json
+import os
+import re
+import sys
+
+import requests
+
+STORAGE_URL = 'https://storage.googleapis.com/webassembly/emscripten-releases-builds'
+
+EMSDK_ROOT = os.path.dirname(os.path.dirname(__file__))
+RELEASES_TAGS_FILE = EMSDK_ROOT + '/emscripten-releases-tags.json'
+BAZEL_REVISIONS_FILE = EMSDK_ROOT + '/bazel/revisions.bzl'
+BAZEL_MODULE_FILE = EMSDK_ROOT + '/bazel/MODULE.bazel'
+
+
+def get_latest_info():
+    with open(RELEASES_TAGS_FILE) as f:
+        info = json.load(f)
+    latest = info['aliases']['latest']
+    return latest, info['releases'][latest]
+
+
+def get_sha(platform, archive_fmt, latest_hash, arch_suffix=''):
+    r = requests.get(f'{STORAGE_URL}/{platform}/{latest_hash}/wasm-binaries{arch_suffix}.{archive_fmt}')
+    r.raise_for_status()
+    print(f'Fetching {r.url}')
+    h = hashlib.new('sha256')
+    for chunk in r.iter_content(chunk_size=1024):
+        h.update(chunk)
+    return h.hexdigest()
+
+
+def revisions_item(version, latest_hash):
+    return f'''\
+    "{version}": struct(
+        hash = "{latest_hash}",
+        sha_linux = "{get_sha('linux', 'tar.xz', latest_hash)}",
+        sha_linux_arm64 = "{get_sha('linux', 'tar.xz', latest_hash, '-arm64')}",
+        sha_mac = "{get_sha('mac', 'tar.xz', latest_hash)}",
+        sha_mac_arm64 = "{get_sha('mac', 'tar.xz', latest_hash, '-arm64')}",
+        sha_win = "{get_sha('win', 'zip', latest_hash)}",
+    ),
+'''
+
+
+def insert_revision(item):
+    with open(BAZEL_REVISIONS_FILE) as f:
+        lines = f.readlines()
+
+    lines.insert(lines.index('EMSCRIPTEN_TAGS = {\n') + 1, item)
+
+    with open(BAZEL_REVISIONS_FILE, 'w') as f:
+        f.write(''.join(lines))
+
+
+def update_module_version(version):
+    with open(BAZEL_MODULE_FILE) as f:
+        content = f.read()
+
+    pattern = r'(module\(\s*name = "emsdk",\s*version = )"\d+.\d+.\d+",\n\)'
+    # Verify that the pattern exists in the input since re.sub will
+    # will succeed either way.
+    assert re.search(pattern, content)
+    content = re.sub(pattern, fr'\1"{version}",\n)', content)
+
+    with open(BAZEL_MODULE_FILE, 'w') as f:
+        f.write(content)
+
+
+def main():
+    version, latest_hash = get_latest_info()
+    update_module_version(version)
+    item = revisions_item(version, latest_hash)
+    print('inserting item:')
+    print(item)
+    insert_revision(item)
+
+
+if __name__ == '__main__':
+    sys.exit(main())