feat(ext/web): implement `AbortSignal.prototype.throwIfAborted()` (#13044)

See whatwg/dom#1034.

2 files changed, 11 insertions, 0 deletions

diff --git a/ext/web/03_abort_signal.js b/ext/web/03_abort_signal.js
index 6b278ba07..d46291b14 100644
--- a/ext/web/03_abort_signal.js
+++ b/ext/web/03_abort_signal.js
@@ -85,6 +85,13 @@
       webidl.assertBranded(this, AbortSignal);
       return this[abortReason];
     }
+
+    throwIfAborted() {
+      webidl.assertBranded(this, AbortSignal);
+      if (this[abortReason] !== undefined) {
+        throw this[abortReason];
+      }
+    }
   }
   defineEventHandler(AbortSignal.prototype, "abort");
 
diff --git a/ext/web/lib.deno_web.d.ts b/ext/web/lib.deno_web.d.ts
index 3cdc2bea6..0f10af7f2 100644
--- a/ext/web/lib.deno_web.d.ts
+++ b/ext/web/lib.deno_web.d.ts
@@ -293,6 +293,10 @@ interface AbortSignal extends EventTarget {
     listener: EventListenerOrEventListenerObject,
     options?: boolean | EventListenerOptions,
   ): void;
+
+  /** Throws this AbortSignal's abort reason, if its AbortController has
+   * signaled to abort; otherwise, does nothing. */
+  throwIfAborted(): void;
 }
 
 declare var AbortSignal: {