let asFileSystemHandle: WebAPI.FileAPI.fileSystemDirectoryHandle => WebAPI.FileAPI.fileSystemHandle
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let getDirectoryHandle: ( WebAPI.FileAPI.fileSystemDirectoryHandle, ~name: string, ~options: WebAPI.FileAPI.fileSystemGetDirectoryOptions=?,) => Promise.t<WebAPI.FileAPI.fileSystemDirectoryHandle>
let getFileHandle: ( WebAPI.FileAPI.fileSystemDirectoryHandle, ~name: string, ~options: WebAPI.FileAPI.fileSystemGetFileOptions=?,) => Promise.t<WebAPI.FileAPI.fileSystemFileHandle>
let isSameEntry: ( WebAPI.FileAPI.fileSystemDirectoryHandle, WebAPI.FileAPI.fileSystemHandle,) => Promise.t<bool>
let removeEntry: ( WebAPI.FileAPI.fileSystemDirectoryHandle, ~name: string, ~options: WebAPI.FileAPI.fileSystemRemoveOptions=?,) => Promise.t<unit>
let resolve: ( WebAPI.FileAPI.fileSystemDirectoryHandle, WebAPI.FileAPI.fileSystemHandle,) => Promise.t<array<string>>