file system api下载

src/types/file-system-access.d.ts

@@ -0,0 +1,53 @@
+// File System Access API 类型定义
+interface FileSystemWritableFileStream extends WritableStream {
+  write(data: BufferSource | Blob | string): Promise<void>;
+  seek(position: number): Promise<void>;
+  truncate(size: number): Promise<void>;
+  close(): Promise<void>;
+}
+
+interface FileSystemFileHandle {
+  createWritable(): Promise<FileSystemWritableFileStream>;
+  getFile(): Promise<File>;
+}
+
+interface FileSystemDirectoryHandle {
+  getFileHandle(name: string, options?: { create?: boolean }): Promise<FileSystemFileHandle>;
+  getDirectoryHandle(name: string, options?: { create?: boolean }): Promise<FileSystemDirectoryHandle>;
+  removeEntry(name: string, options?: { recursive?: boolean }): Promise<void>;
+  resolve(possibleDescendant: FileSystemHandle): Promise<string[] | null>;
+  keys(): AsyncIterableIterator<string>;
+  values(): AsyncIterableIterator<FileSystemHandle>;
+  entries(): AsyncIterableIterator<[string, FileSystemHandle]>;
+}
+
+interface FileSystemHandle {
+  readonly kind: 'file' | 'directory';
+  readonly name: string;
+  isSameEntry(other: FileSystemHandle): Promise<boolean>;
+}
+
+interface Window {
+  showDirectoryPicker(options?: {
+    id?: string;
+    mode?: 'read' | 'readwrite';
+    startIn?: FileSystemHandle | string;
+  }): Promise<FileSystemDirectoryHandle>;
+
+  showOpenFilePicker(options?: {
+    multiple?: boolean;
+    excludeAcceptAllOption?: boolean;
+    types?: Array<{
+      description?: string;
+      accept: Record<string, string[]>;
+    }>;
+  }): Promise<FileSystemFileHandle[]>;
+
+  showSaveFilePicker(options?: {
+    suggestedName?: string;
+    types?: Array<{
+      description?: string;
+      accept: Record<string, string[]>;
+    }>;
+  }): Promise<FileSystemFileHandle>;
+}