Add AbortSignal polyfills

src/lib/polyfills.ts

@@ -0,0 +1,78 @@
+/**
+ * Polyfill for AbortSignal.any()
+ * 
+ * AbortSignal.any() creates an AbortSignal that will be aborted when any of the
+ * provided signals are aborted. This is useful for combining multiple abort signals.
+ * 
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal/any_static
+ */
+
+// Check if AbortSignal.any is already available
+if (!AbortSignal.any) {
+  AbortSignal.any = function(signals: AbortSignal[]): AbortSignal {
+    // If no signals provided, return a signal that never aborts
+    if (signals.length === 0) {
+      return new AbortController().signal;
+    }
+
+    // If only one signal, return it directly for efficiency
+    if (signals.length === 1) {
+      return signals[0];
+    }
+
+    // Check if any signal is already aborted
+    for (const signal of signals) {
+      if (signal.aborted) {
+        // Create an already-aborted signal with the same reason
+        const controller = new AbortController();
+        controller.abort(signal.reason);
+        return controller.signal;
+      }
+    }
+
+    // Create a new controller for the combined signal
+    const controller = new AbortController();
+
+    // Function to abort the combined signal
+    const onAbort = (event: Event) => {
+      const target = event.target as AbortSignal;
+      controller.abort(target.reason);
+    };
+
+    // Listen for abort events on all input signals
+    for (const signal of signals) {
+      signal.addEventListener('abort', onAbort, { once: true });
+    }
+
+    // Clean up listeners when the combined signal is aborted
+    controller.signal.addEventListener('abort', () => {
+      for (const signal of signals) {
+        signal.removeEventListener('abort', onAbort);
+      }
+    }, { once: true });
+
+    return controller.signal;
+  };
+}
+
+/**
+ * Polyfill for AbortSignal.timeout()
+ * 
+ * AbortSignal.timeout() creates an AbortSignal that will be aborted after a
+ * specified number of milliseconds.
+ * 
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal/timeout_static
+ */
+
+// Check if AbortSignal.timeout is already available
+if (!AbortSignal.timeout) {
+  AbortSignal.timeout = function(milliseconds: number): AbortSignal {
+    const controller = new AbortController();
+    
+    setTimeout(() => {
+      controller.abort(new DOMException('The operation was aborted due to timeout', 'TimeoutError'));
+    }, milliseconds);
+    
+    return controller.signal;
+  };
+}

src/main.tsx

@@ -1,7 +1,10 @@
-import { createRoot } from 'react-dom/client'
+import { createRoot } from 'react-dom/client';
 
-import App from './App.tsx'
+// Import polyfills first
-import './index.css'
+import './lib/polyfills.ts';
+
+import App from './App.tsx';
+import './index.css';
 
 // FIXME: a custom font should be used. Eg:
 // import '@fontsource-variable/<font-name>';