fix: mime types

desktop/electron-serve.ts

@@ -11,6 +11,7 @@
 import type {BrowserWindow, Protocol} from 'electron';
 import {app, protocol, session} from 'electron';
 import fs from 'fs';
+import mime from 'mime-types';
 import path from 'path';
 
 type RegisterBufferProtocol = Protocol['registerBufferProtocol'];
@@ -63,11 +64,12 @@ export default function electronServe(options: ServeOptions) {
     const handler: HandlerType = async (request, callback) => {
         const filePath = path.join(mandatoryOptions.directory, decodeURIComponent(new URL(request.url).pathname));
         const resolvedPath = (await getPath(filePath)) ?? path.join(mandatoryOptions.directory, `${mandatoryOptions.file}.html`);
+        const mimeType = (mime.lookup(resolvedPath) || 'application/octet-stream') as string;
 
         try {
             const data = await fs.promises.readFile(resolvedPath);
             callback({
-                mimeType: 'text/html',
+                mimeType,
                 data: Buffer.from(data),
                 headers: {
                     // eslint-disable-next-line @typescript-eslint/naming-convention

desktop/package.json

@@ -7,9 +7,13 @@
     "electron-context-menu": "^2.3.0",
     "electron-log": "^4.4.8",
     "electron-updater": "^6.3.2",
+    "mime-types": "^2.1.35",
     "node-machine-id": "^1.1.12"
   },
   "author": "Expensify, Inc.",
   "license": "MIT",
-  "private": true
+  "private": true,
+  "devDependencies": {
+    "@types/mime-types": "^2.1.4"
+  }
 }