Improve error stacks for async ops (#2820)

1 files changed, 19 insertions, 0 deletions

diff --git a/js/dispatch_json_test.ts b/js/dispatch_json_test.ts
new file mode 100644
index 000000000..47e5cef2f
--- /dev/null
+++ b/js/dispatch_json_test.ts
@@ -0,0 +1,19 @@
+import { testPerm, assertMatch, unreachable } from "./test_util.ts";
+
+const openErrorStackPattern = new RegExp(
+  `^.*
+    at unwrapResponse \\(js\\/dispatch_json\\.ts:.*\\)
+    at sendAsync.* \\(js\\/dispatch_json\\.ts:.*\\)
+    at async Object\\.open \\(js\\/files\\.ts:.*\\).*$`,
+  "ms"
+);
+
+testPerm({ read: true }, async function sendAsyncStackTrace(): Promise<void> {
+  await Deno.open("nonexistent.txt")
+    .then(unreachable)
+    .catch(
+      (error): void => {
+        assertMatch(error.stack, openErrorStackPattern);
+      }
+    );
+});