first implementation

frontend/node_modules/axios/lib/helpers/composeSignals.js

@@ -0,0 +1,56 @@
+import CanceledError from '../cancel/CanceledError.js';
+import AxiosError from '../core/AxiosError.js';
+import utils from '../utils.js';
+
+const composeSignals = (signals, timeout) => {
+  const { length } = (signals = signals ? signals.filter(Boolean) : []);
+
+  if (timeout || length) {
+    let controller = new AbortController();
+
+    let aborted;
+
+    const onabort = function (reason) {
+      if (!aborted) {
+        aborted = true;
+        unsubscribe();
+        const err = reason instanceof Error ? reason : this.reason;
+        controller.abort(
+          err instanceof AxiosError
+            ? err
+            : new CanceledError(err instanceof Error ? err.message : err)
+        );
+      }
+    };
+
+    let timer =
+      timeout &&
+      setTimeout(() => {
+        timer = null;
+        onabort(new AxiosError(`timeout of ${timeout}ms exceeded`, AxiosError.ETIMEDOUT));
+      }, timeout);
+
+    const unsubscribe = () => {
+      if (signals) {
+        timer && clearTimeout(timer);
+        timer = null;
+        signals.forEach((signal) => {
+          signal.unsubscribe
+            ? signal.unsubscribe(onabort)
+            : signal.removeEventListener('abort', onabort);
+        });
+        signals = null;
+      }
+    };
+
+    signals.forEach((signal) => signal.addEventListener('abort', onabort));
+
+    const { signal } = controller;
+
+    signal.unsubscribe = () => utils.asap(unsubscribe);
+
+    return signal;
+  }
+};
+
+export default composeSignals;