Switch to mjs

extensions/wasm_bindgen/rules_js/test/BUILD.bazel

@@ -70,13 +70,13 @@ _WASM_DATA = [
 js_test(
     name = "hello_world_wasm_direct_test",
     data = _WASM_DATA,
-    entry_point = "hello_world_wasm_test.js",
+    entry_point = "hello_world_wasm_test.mjs",
 )
 
 js_library(
     name = "hello_world_wasm_lib",
     srcs = [
-        "hello_world_wasm_test.js",
+        "hello_world_wasm_test.mjs",
     ],
     data = _WASM_DATA,
     deps = [],

extensions/wasm_bindgen/rules_js/test/hello_world_wasm_test.mjs

@@ -0,0 +1,28 @@
+import path from "path";
+import assert from "assert";
+import { fileURLToPath } from "url";
+
+const main = async function (typ, dir) {
+    const filename = fileURLToPath(import.meta.url);
+    const dirname = path.dirname(filename);
+
+    const wasm_module = path.join(
+        dirname,
+        "..",
+        dir,
+        "test",
+        `hello_world_${typ}_wasm_bindgen`,
+        `hello_world_${typ}_wasm_bindgen.js`,
+    );
+
+    const res = await import(wasm_module);
+
+    assert.strictEqual(res.instance.exports.double(2), 4);
+};
+
+["bundler", "web", "deno", "nomodules", "nodejs"].forEach((typ) => {
+    main(typ, process.argv.length > 2 ? process.argv[2] : "").catch((err) => {
+        console.error(err);
+        process.exit(1);
+    });
+});