From 6ec259a0e71174651bae95d4628138bf6fd68742 Mon Sep 17 00:00:00 2001
From: kj_sh604
Date: Sun, 15 Mar 2026 16:19:35 -0400
Subject: refactor: packages/

---
 packages/excalidraw/data/filesystem.ts | 104 +++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 packages/excalidraw/data/filesystem.ts

(limited to 'packages/excalidraw/data/filesystem.ts')

diff --git a/packages/excalidraw/data/filesystem.ts b/packages/excalidraw/data/filesystem.ts
new file mode 100644
index 0000000..186d587
--- /dev/null
+++ b/packages/excalidraw/data/filesystem.ts
@@ -0,0 +1,104 @@
+import type { FileSystemHandle } from "browser-fs-access";
+import {
+  fileOpen as _fileOpen,
+  fileSave as _fileSave,
+  supported as nativeFileSystemSupported,
+} from "browser-fs-access";
+import { EVENT, MIME_TYPES } from "../constants";
+import { AbortError } from "../errors";
+import { debounce } from "../utils";
+
+type FILE_EXTENSION = Exclude<keyof typeof MIME_TYPES, "binary">;
+
+const INPUT_CHANGE_INTERVAL_MS = 500;
+
+export const fileOpen = <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[]);
+
+  return _fileOpen({
+    description: opts.description,
+    extensions,
+    mimeTypes,
+    multiple: opts.multiple ?? false,
+    legacySetup: (resolve, reject, input) => {
+      const scheduleRejection = debounce(reject, INPUT_CHANGE_INTERVAL_MS);
+      const focusHandler = () => {
+        checkForFile();
+        document.addEventListener(EVENT.KEYUP, scheduleRejection);
+        document.addEventListener(EVENT.POINTER_UP, scheduleRejection);
+        scheduleRejection();
+      };
+      const checkForFile = () => {
+        // this hack might not work when expecting multiple files
+        if (input.files?.length) {
+          const ret = opts.multiple ? [...input.files] : input.files[0];
+          resolve(ret as RetType);
+        }
+      };
+      requestAnimationFrame(() => {
+        window.addEventListener(EVENT.FOCUS, focusHandler);
+      });
+      const interval = window.setInterval(() => {
+        checkForFile();
+      }, INPUT_CHANGE_INTERVAL_MS);
+      return (rejectPromise) => {
+        clearInterval(interval);
+        scheduleRejection.cancel();
+        window.removeEventListener(EVENT.FOCUS, focusHandler);
+        document.removeEventListener(EVENT.KEYUP, scheduleRejection);
+        document.removeEventListener(EVENT.POINTER_UP, scheduleRejection);
+        if (rejectPromise) {
+          // so that something is shown in console if we need to debug this
+          console.warn("Opening the file was canceled (legacy-fs).");
+          rejectPromise(new AbortError());
+        }
+      };
+    },
+  }) as Promise<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 FileSystemHandle */
+    fileHandle?: FileSystemHandle | null;
+  },
+) => {
+  return _fileSave(
+    blob,
+    {
+      fileName: `${opts.name}.${opts.extension}`,
+      description: opts.description,
+      extensions: [`.${opts.extension}`],
+      mimeTypes: opts.mimeTypes,
+    },
+    opts.fileHandle,
+  );
+};
+
+export { nativeFileSystemSupported };
+export type { FileSystemHandle };
-- 
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