Add JavaScript bindings and WASM support

Co-authored-by: Matija Kecman <matijak@google.com>
Co-authored-by: Sebastian Noreña Rendón <sebas.norena@creativa77.com.ar>
Co-authored-by: Kyle Bayes <kylebayes@google.com>
PiperOrigin-RevId: 826479070
Change-Id: I25acf36e6c20b091d8492e10798d028ae66f6733

wasm/codegen/helpers/code_builder_test.py

@@ -0,0 +1,51 @@
+# Copyright 2025 DeepMind Technologies Limited
+#
+# 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.
+
+"""Tests for the code_builder module."""
+
+from absl.testing import absltest
+from wasm.codegen.helpers import code_builder
+
+
+class CodeBuilderTest(absltest.TestCase):
+
+  def test_code_builder_functionality(self):
+    """Test nested indentation blocks."""
+    builder = code_builder.CodeBuilder(indent_str="    ")
+    builder.line("let a = 1")
+    with builder.block("function myFunc()"):
+      builder.line("let flag = true")
+      with builder.block("while (flag)"):
+        builder.line("a++")
+        builder.line("flag = a < 10")
+      builder.line("return a")
+    builder.line("print('Done')")
+
+    expected_lines = [
+        "let a = 1",
+        "function myFunc() {",
+        "    let flag = true",
+        "    while (flag) {",
+        "        a++",
+        "        flag = a < 10",
+        "    }",
+        "    return a",
+        "}",
+        "print('Done')",
+    ]
+    self.assertEqual(builder.to_string(), "\n".join(expected_lines))
+
+
+if __name__ == "__main__":
+  absltest.main()