Add AbortSignal.any polyfill

src/polyfills.js

@@ -11,6 +11,36 @@ if ('AbortSignal' in window) {
     });
 }
 
+// AbortSignal.any polyfill
+// Based on https://github.com/mozilla/pdf.js/pull/19681/files
+if ('AbortSignal' in window && !AbortSignal.any) {
+  AbortSignal.any = function (iterable) {
+    const ac = new AbortController();
+    const { signal } = ac;
+
+    // Return immediately if any of the signals are already aborted.
+    for (const s of iterable) {
+      if (s.aborted) {
+        ac.abort(s.reason);
+        return signal;
+      }
+    }
+
+    // Register "abort" listeners for all signals.
+    for (const s of iterable) {
+      s.addEventListener(
+        'abort',
+        () => {
+          ac.abort(s.reason);
+        },
+        { signal }, // Automatically remove the listener.
+      );
+    }
+
+    return signal;
+  };
+}
+
 // URL.parse() polyfill
 if ('URL' in window && typeof URL.parse !== 'function') {
   URL.parse = function (url, base) {