feat: support Deno namespace in Worker API (#4784)

4 files changed, 50 insertions, 2 deletions

diff --git a/cli/tests/subdir/deno_worker.ts b/cli/tests/subdir/deno_worker.ts
new file mode 100644
index 000000000..6a57c47f0
--- /dev/null
+++ b/cli/tests/subdir/deno_worker.ts
@@ -0,0 +1,7 @@
+onmessage = function (e): void {
+  if (typeof self.Deno === "undefined") {
+    throw new Error("Deno namespace not available in worker");
+  }
+
+  postMessage(e.data);
+};
diff --git a/cli/tests/subdir/non_deno_worker.js b/cli/tests/subdir/non_deno_worker.js
new file mode 100644
index 000000000..773721560
--- /dev/null
+++ b/cli/tests/subdir/non_deno_worker.js
@@ -0,0 +1,7 @@
+onmessage = function (e) {
+  if (typeof self.Deno !== "undefined") {
+    throw new Error("Deno namespace unexpectedly available in worker");
+  }
+
+  postMessage(e.data);
+};
diff --git a/cli/tests/workers_test.out b/cli/tests/workers_test.out
index d3c25d3dd..903226283 100644
--- a/cli/tests/workers_test.out
+++ b/cli/tests/workers_test.out
@@ -1,4 +1,4 @@
-running 8 tests
+running 9 tests
 test worker terminate ... ok [WILDCARD]
 test worker nested ... ok [WILDCARD]
 test worker throws when executing ... ok [WILDCARD]
@@ -7,5 +7,6 @@ test worker terminate busy loop ... ok [WILDCARD]
 test worker race condition ... ok [WILDCARD]
 test worker is event listener ... ok [WILDCARD]
 test worker scope is event listener ... ok [WILDCARD]
+test worker with Deno namespace ... ok [WILDCARD]
 
-test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out [WILDCARD]
+test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out [WILDCARD]
diff --git a/cli/tests/workers_test.ts b/cli/tests/workers_test.ts
index c51adcf75..c4b93db3c 100644
--- a/cli/tests/workers_test.ts
+++ b/cli/tests/workers_test.ts
@@ -257,3 +257,36 @@ Deno.test({
     worker.terminate();
   },
 });
+
+Deno.test({
+  name: "worker with Deno namespace",
+  fn: async function (): Promise<void> {
+    const promise = createResolvable();
+    const promise2 = createResolvable();
+
+    const regularWorker = new Worker("../tests/subdir/non_deno_worker.js", {
+      type: "module",
+    });
+    const denoWorker = new Worker("../tests/subdir/deno_worker.ts", {
+      type: "module",
+      deno: true,
+    });
+
+    regularWorker.onmessage = (e): void => {
+      assertEquals(e.data, "Hello World");
+      regularWorker.terminate();
+      promise.resolve();
+    };
+
+    denoWorker.onmessage = (e): void => {
+      assertEquals(e.data, "Hello World");
+      denoWorker.terminate();
+      promise2.resolve();
+    };
+
+    regularWorker.postMessage("Hello World");
+    await promise;
+    denoWorker.postMessage("Hello World");
+    await promise2;
+  },
+});