feat(op_crates/web) EventTarget signal support (#8616)

Fixes: https://github.com/denoland/deno/issues/8606

1 files changed, 14 insertions, 2 deletions

diff --git a/op_crates/web/01_event.js b/op_crates/web/01_event.js
index ed76a4281..35b269ea4 100644
--- a/op_crates/web/01_event.js
+++ b/op_crates/web/01_event.js
@@ -693,7 +693,7 @@
     for (let i = 0; i < handlers.length; i++) {
       const listener = handlers[i];
 
-      let capture, once, passive;
+      let capture, once, passive, signal;
       if (typeof listener.options === "boolean") {
         capture = listener.options;
         once = false;
@@ -895,7 +895,19 @@
           return;
         }
       }
-
+      if (options?.signal) {
+        const signal = options?.signal;
+        if (signal.aborted) {
+          // If signal is not null and its aborted flag is set, then return.
+          return;
+        } else {
+          // If listener’s signal is not null, then add the following abort
+          // abort steps to it: Remove an event listener.
+          signal.addEventListener("abort", () => {
+            this.removeEventListener(type, callback, options);
+          });
+        }
+      }
       listeners[type].push({ callback, options });
     }