compat: support --compat in web workers (#13629)

Adds another callback to WebWorkerOptions that allows to execute
some modules before actual worker code executes. This allows to set up Node
global using std/node.

4 files changed, 34 insertions, 0 deletions

diff --git a/cli/tests/integration/compat_tests.rs b/cli/tests/integration/compat_tests.rs
index bafe24af3..189e1eb41 100644
--- a/cli/tests/integration/compat_tests.rs
+++ b/cli/tests/integration/compat_tests.rs
@@ -90,6 +90,11 @@ itest!(top_level_fail_esm {
   output: "compat/test_runner/top_level_fail_esm.out",
 });
 
+itest!(compat_worker {
+  args: "run --compat --unstable -A --quiet --no-check compat/worker/worker_test.mjs",
+  output: "compat/worker/worker_test.out",
+});
+
 #[test]
 fn globals_in_repl() {
   let (out, _err) = util::run_and_collect_output_with_args(
diff --git a/cli/tests/testdata/compat/worker/worker.mjs b/cli/tests/testdata/compat/worker/worker.mjs
new file mode 100644
index 000000000..eb7cfed19
--- /dev/null
+++ b/cli/tests/testdata/compat/worker/worker.mjs
@@ -0,0 +1,9 @@
+console.log("hello from worker");
+
+self.onmessage = (e) => {
+    if (e.data != "hello") {
+        throw new Error("wrong message");
+    }
+
+    self.postMessage({ pid: process.pid });
+}
diff --git a/cli/tests/testdata/compat/worker/worker_test.mjs b/cli/tests/testdata/compat/worker/worker_test.mjs
new file mode 100644
index 000000000..215605487
--- /dev/null
+++ b/cli/tests/testdata/compat/worker/worker_test.mjs
@@ -0,0 +1,18 @@
+import { deferred } from "../../../../../test_util/std/async/deferred.ts";
+
+const promise = deferred();
+const url = new URL("./worker.mjs", import.meta.url);
+const worker = new Worker(url.href, { type: "module", deno: true });
+
+worker.onmessage = (e) => {
+    const pid = e.data.pid;
+    if (typeof pid != "number") {
+        throw new Error("pid is not a number");
+    }
+    console.log("process.pid from worker:", pid);
+    promise.resolve();
+};
+
+worker.postMessage("hello");
+await promise;
+worker.terminate();
diff --git a/cli/tests/testdata/compat/worker/worker_test.out b/cli/tests/testdata/compat/worker/worker_test.out
new file mode 100644
index 000000000..373841945
--- /dev/null
+++ b/cli/tests/testdata/compat/worker/worker_test.out
@@ -0,0 +1,2 @@
+hello from worker
+process.pid from worker: [WILDCARD]