Archipelago — open-source initial import

aiui/packages/app/src/composables/useDeduplicatedFetch.ts

@@ -0,0 +1,29 @@
+const inflight = new Map<string, Promise<Response>>()
+
+export function useDeduplicatedFetch() {
+  async function dedupFetch(url: string, options?: RequestInit): Promise<Response> {
+    // Generate a cache key from URL + body
+    const bodyStr = options?.body ? String(options.body) : ''
+    const key = `${options?.method ?? 'GET'}:${url}:${bodyStr}`
+
+    const existing = inflight.get(key)
+    if (existing) return existing.then(r => r.clone())
+
+    const controller = new AbortController()
+    const mergedOptions = { ...options, signal: controller.signal }
+
+    const promise = fetch(url, mergedOptions).finally(() => {
+      inflight.delete(key)
+    })
+
+    inflight.set(key, promise)
+
+    return promise
+  }
+
+  function cancelAll() {
+    inflight.clear()
+  }
+
+  return { dedupFetch, cancelAll }
+}