feat: add mimeTypes on file save (#8946)

packages/excalidraw/data/filesystem.ts

@@ -82,6 +82,7 @@ export const fileSave = (
     name: string;
     /** file extension */
     extension: FILE_EXTENSION;
+    mimeTypes?: string[];
     description: string;
     /** existing FileSystemHandle */
     fileHandle?: FileSystemHandle | null;
@@ -93,10 +94,11 @@ export const fileSave = (
       fileName: `${opts.name}.${opts.extension}`,
       description: opts.description,
       extensions: [`.${opts.extension}`],
+      mimeTypes: opts.mimeTypes,
     },
     opts.fileHandle,
   );
 };
 
-export type { FileSystemHandle };
 export { nativeFileSystemSupported };
+export type { FileSystemHandle };

packages/excalidraw/data/index.ts

@@ -5,6 +5,7 @@ import {
 import {
   DEFAULT_EXPORT_PADDING,
   DEFAULT_FILENAME,
+  IMAGE_MIME_TYPES,
   isFirefox,
   MIME_TYPES,
 } from "../constants";
@@ -15,8 +16,9 @@ import type {
   ExcalidrawFrameLikeElement,
   NonDeletedExcalidrawElement,
 } from "../element/types";
+import { getElementsOverlappingFrame } from "../frame";
 import { t } from "../i18n";
-import { isSomeElementSelected, getSelectedElements } from "../scene";
+import { getSelectedElements, isSomeElementSelected } from "../scene";
 import { exportToCanvas, exportToSvg } from "../scene/export";
 import type { ExportType } from "../scene/types";
 import type { AppState, BinaryFiles } from "../types";
@@ -25,7 +27,6 @@ import { canvasToBlob } from "./blob";
 import type { FileSystemHandle } from "./filesystem";
 import { fileSave } from "./filesystem";
 import { serializeAsJSON } from "./json";
-import { getElementsOverlappingFrame } from "../frame";
 
 export { loadFromBlob } from "./blob";
 export { loadFromJSON, saveAsJSON } from "./json";
@@ -130,6 +131,7 @@ export const exportCanvas = async (
           description: "Export to SVG",
           name,
           extension: appState.exportEmbedScene ? "excalidraw.svg" : "svg",
+          mimeTypes: [IMAGE_MIME_TYPES.svg],
           fileHandle,
         },
       );
@@ -171,6 +173,7 @@ export const exportCanvas = async (
       // FIXME reintroduce `excalidraw.png` when most people upgrade away
       // from 111.0.5563.64 (arm64), see #6349
       extension: /* appState.exportEmbedScene ? "excalidraw.png" : */ "png",
+      mimeTypes: [IMAGE_MIME_TYPES.png],
       fileHandle,
     });
   } else if (type === "clipboard") {