refactor(mediabunny): [PKG-MB-03] type inputs and cancel owned loads

packages/artplayer-proxy-mediabunny/src/preflight.ts

@@ -0,0 +1,30 @@
+import { isHlsSource } from './input'
+
+interface RangeEvents {
+  emit: (type: string, detail?: Event) => void
+}
+
+export async function preflightRange(url: unknown, enabled: boolean, events: RangeEvents, signal?: AbortSignal, isCurrent = (): boolean => true): Promise<boolean> {
+  if (signal?.aborted || !isCurrent())
+    return false
+  if (!enabled || typeof url !== 'string' || isHlsSource(url))
+    return true
+
+  try {
+    const res = await fetch(url, signal ? { method: 'HEAD', signal } : { method: 'HEAD' })
+    if (signal?.aborted || !isCurrent())
+      return false
+    const acceptRanges = res.headers.get('accept-ranges')
+    if (!acceptRanges || acceptRanges === 'none') {
+      events.emit('error', new Event('RangeNotSupported'))
+      return false
+    }
+    return true
+  }
+  catch (error) {
+    if (signal?.aborted || !isCurrent())
+      return false
+    console.warn('Preflight check failed:', error)
+    return true
+  }
+}