Dropped another js tool.

tools/check_web_sanity.py

@@ -0,0 +1,29 @@
+#! /usr/bin/env python3
+# Copyright 2023 Bradley D. Nelson
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import re
+import sys
+
+source = sys.stdin.read()
+
+if 'Invalid' in source:
+  print('BAD ASM.JS')
+  print(source)
+  sys.exit(1)
+
+if not source.strip().endswith('--> 123'):
+  print('MISSING EXPECTED OUTPUT')
+  print(source)
+  sys.exit(1)