fix(runtime/web_worker): Don't block self.onmessage with TLA (#9619)

This commit rewrites implementation of "JsRuntime::mod_evaluate". 

Event loop is no longer polled automatically and users must manually
drive event loop forward after calling "mod_evaluate".

Co-authored-by: Nayeem Rahman <nayeemrmn99@gmail.com>
Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

1 files changed, 16 insertions, 1 deletions

diff --git a/runtime/worker.rs b/runtime/worker.rs
index 97466fadb..e63fdbe18 100644
--- a/runtime/worker.rs
+++ b/runtime/worker.rs
@@ -10,6 +10,7 @@ use crate::permissions::Permissions;
 use deno_core::error::AnyError;
 use deno_core::futures::future::poll_fn;
 use deno_core::futures::future::FutureExt;
+use deno_core::futures::stream::StreamExt;
 use deno_core::serde_json;
 use deno_core::serde_json::json;
 use deno_core::url::Url;
@@ -221,7 +222,21 @@ impl MainWorker {
   ) -> Result<(), AnyError> {
     let id = self.preload_module(module_specifier).await?;
     self.wait_for_inspector_session();
-    self.js_runtime.mod_evaluate(id).await
+    let mut receiver = self.js_runtime.mod_evaluate(id);
+    tokio::select! {
+      maybe_result = receiver.next() => {
+        debug!("received module evaluate {:#?}", maybe_result);
+        let result = maybe_result.expect("Module evaluation result not provided.");
+        return result;
+      }
+
+      event_loop_result = self.run_event_loop() => {
+        event_loop_result?;
+        let maybe_result = receiver.next().await;
+        let result = maybe_result.expect("Module evaluation result not provided.");
+        return result;
+      }
+    }
   }
 
   fn wait_for_inspector_session(&mut self) {