diff --git a/crates/base/tests/eszip_migration.rs b/crates/base/tests/eszip_migration.rs
index e2023a19a..b1a3d96a7 100644
--- a/crates/base/tests/eszip_migration.rs
+++ b/crates/base/tests/eszip_migration.rs
@@ -2,6 +2,7 @@ use std::fs::read_dir;
 use std::path::Path;
 use std::path::PathBuf;
 
+use anyhow::anyhow;
 use anyhow::bail;
 use base::worker::TerminationToken;
 use base::worker::WorkerSurfaceBuilder;
@@ -15,6 +16,8 @@ use deno_facade::payload_to_eszip;
 use deno_facade::EszipPayloadKind;
 use eszip::v2::EszipV2Module;
 use eszip::v2::EszipV2SourceSlot;
+use ext_event_worker::events::WorkerEventWithMetadata;
+use ext_event_worker::events::WorkerEvents;
 use ext_workers::context::UserWorkerMsgs;
 use ext_workers::context::UserWorkerRuntimeOpts;
 use ext_workers::context::WorkerContextInitOpts;
@@ -77,8 +80,26 @@ where
 {
   let buf = read(path.as_ref()).await?;
   let eszip = EszipPayloadKind::VecKind(buf.clone());
+  let metadata_path =
+    PathBuf::from(format!("{}.metadata", &path.as_ref().to_string_lossy()));
+  let metadata = if metadata_path.exists() {
+    let buf = read(metadata_path).await?;
+    Some(serde_json::from_slice::<serde_json::Value>(&buf)?)
+  } else {
+    None
+  }
+  .unwrap_or(serde_json::Value::Object(Default::default()));
+  let capture_event_loop_error =
+    get_bool_from_json_value(&metadata, "captureEventLoopError")
+      .unwrap_or_default();
+  let (tx, rx) = if capture_event_loop_error {
+    let (tx, rx) = mpsc::unbounded_channel::<WorkerEventWithMetadata>();
+    (Some(tx), Some(rx))
+  } else {
+    (None, None)
+  };
   let (maybe_entrypoint, maybe_import_map_path) =
-    guess_eszip_entrypoint_and_import_map_path(path, buf).await?;
+    guess_eszip_entrypoint_and_import_map_path(&metadata, buf).await?;
   let termination_token = TerminationToken::new();
   let (pool_msg_tx, mut pool_msg_rx) = mpsc::unbounded_channel();
   let worker_surface = WorkerSurfaceBuilder::new()
@@ -94,7 +115,7 @@ where
         service_path: Some(String::from("meow")),
         key: Some(Uuid::new_v4()),
         pool_msg_tx: Some(pool_msg_tx),
-        events_msg_tx: None,
+        events_msg_tx: tx,
         cancel: None,
         context: json!({
           "importMapPath": maybe_import_map_path
@@ -127,35 +148,36 @@ where
   });
 
   termination_token.cancel_and_wait().await;
-  worker_surface.map(|_| ())
-}
+  worker_surface.map(|_| ())?;
 
-async fn guess_eszip_entrypoint_and_import_map_path<P>(
-  path: P,
-  buf: Vec<u8>,
-) -> Result<(Option<String>, Option<String>), AnyError>
-where
-  P: AsRef<Path>,
-{
-  let metadata_path =
-    PathBuf::from(format!("{}.metadata", &path.as_ref().to_string_lossy()));
-  let (metadata_entrypoint, metadata_import_map_path) =
-    if metadata_path.exists() {
-      fn get_str(value: &serde_json::Value, key: &str) -> Option<String> {
-        value
-          .get(key)
-          .and_then(|it| it.as_str().map(str::to_string))
+  if let Some(mut rx) = rx {
+    rx.close();
+    let mut msgs = vec![];
+    while let Some(msg) = rx.recv().await {
+      msgs.push(msg);
+    }
+    for msg in msgs {
+      match msg.event {
+        WorkerEvents::BootFailure(ev) => return Err(anyhow!(ev.msg)),
+        WorkerEvents::UncaughtException(ev) => {
+          return Err(anyhow!(ev.exception))
+        }
+        _ => {}
       }
+    }
+  }
 
-      let buf = read(metadata_path).await?;
-      let metadata = serde_json::from_slice::<serde_json::Value>(&buf)?;
-      (
-        get_str(&metadata, "entrypoint"),
-        get_str(&metadata, "importMap"),
-      )
-    } else {
-      (None, None)
-    };
+  Ok(())
+}
+
+async fn guess_eszip_entrypoint_and_import_map_path(
+  metadata: &serde_json::Value,
+  buf: Vec<u8>,
+) -> Result<(Option<String>, Option<String>), AnyError> {
+  let (metadata_entrypoint, metadata_import_map_path) = (
+    get_str_from_json_value(metadata, "entrypoint"),
+    get_str_from_json_value(metadata, "importMap"),
+  );
   let mut eszip = migrate::try_migrate_if_needed(
     payload_to_eszip(EszipPayloadKind::VecKind(buf)).await?,
     None,
@@ -285,3 +307,19 @@ fn get_testdata_paths() -> Result<Vec<PathBuf>, AnyError> {
   }
   Ok(paths)
 }
+
+fn get_str_from_json_value(
+  value: &serde_json::Value,
+  key: &str,
+) -> Option<String> {
+  value
+    .get(key)
+    .and_then(|it| it.as_str().map(str::to_string))
+}
+
+fn get_bool_from_json_value(
+  value: &serde_json::Value,
+  key: &str,
+) -> Option<bool> {
+  value.get(key).and_then(|it| it.as_bool())
+}
diff --git a/crates/base/tests/fixture/testdata/fdqdoblxppxtigtdfhbh_bd3072a8-13a2-4c8c-9e38-ebf55a6e7e9c_3.metadata b/crates/base/tests/fixture/testdata/fdqdoblxppxtigtdfhbh_bd3072a8-13a2-4c8c-9e38-ebf55a6e7e9c_3.metadata
new file mode 100644
index 000000000..8bb5e648c
--- /dev/null
+++ b/crates/base/tests/fixture/testdata/fdqdoblxppxtigtdfhbh_bd3072a8-13a2-4c8c-9e38-ebf55a6e7e9c_3.metadata
@@ -0,0 +1,3 @@
+{
+  "captureEventLoopError": true
+}
diff --git a/crates/base/tests/fixture/testdata/fdqdoblxppxtigtdfhbh_bd3072a8-13a2-4c8c-9e38-ebf55a6e7e9c_3.snapshot b/crates/base/tests/fixture/testdata/fdqdoblxppxtigtdfhbh_bd3072a8-13a2-4c8c-9e38-ebf55a6e7e9c_3.snapshot
new file mode 100644
index 000000000..e69de29bb