snapshot of https://github.com/excalidraw/excalidraw.git (master, 2026-09-16; blobs > 131072B omitted)

packages/excalidraw/data/filesystem.ts

@@ -0,0 +1,75 @@
+import {
+  fileOpen as _fileOpen,
+  fileSave as _fileSave,
+  supported as nativeFileSystemSupported,
+} from "browser-fs-access";
+
+import { MIME_TYPES } from "@excalidraw/common";
+
+import { normalizeFile } from "./blob";
+
+type FILE_EXTENSION = Exclude<keyof typeof MIME_TYPES, "binary">;
+
+export const fileOpen = async <M extends boolean | undefined = false>(opts: {
+  extensions?: FILE_EXTENSION[];
+  description: string;
+  multiple?: M;
+}): Promise<M extends false | undefined ? File : File[]> => {
+  // an unsafe TS hack, alas not much we can do AFAIK
+  type RetType = M extends false | undefined ? File : File[];
+
+  const mimeTypes = opts.extensions?.reduce((mimeTypes, type) => {
+    mimeTypes.push(MIME_TYPES[type]);
+
+    return mimeTypes;
+  }, [] as string[]);
+
+  const extensions = opts.extensions?.reduce((acc, ext) => {
+    if (ext === "jpg") {
+      return acc.concat(".jpg", ".jpeg");
+    }
+    return acc.concat(`.${ext}`);
+  }, [] as string[]);
+
+  const files = await _fileOpen({
+    description: opts.description,
+    extensions,
+    mimeTypes,
+    multiple: opts.multiple ?? false,
+  });
+
+  if (Array.isArray(files)) {
+    return (await Promise.all(
+      files.map((file) => normalizeFile(file)),
+    )) as RetType;
+  }
+  return (await normalizeFile(files)) as RetType;
+};
+
+export const fileSave = (
+  blob: Blob | Promise<Blob>,
+  opts: {
+    /** supply without the extension */
+    name: string;
+    /** file extension */
+    extension: FILE_EXTENSION;
+    mimeTypes?: string[];
+    description: string;
+    /** existing FileSystemFileHandle */
+    fileHandle?: FileSystemFileHandle | null;
+  },
+) => {
+  return _fileSave(
+    blob,
+    {
+      fileName: `${opts.name}.${opts.extension}`,
+      description: opts.description,
+      extensions: [`.${opts.extension}`],
+      mimeTypes: opts.mimeTypes,
+    },
+    opts.fileHandle,
+    false,
+  );
+};
+
+export { nativeFileSystemSupported };