Add mode to directoryOpen().

Fixes #120

index.d.ts

@@ -130,6 +130,8 @@ export type WellKnownDirectory =
   | 'pictures'
   | 'videos';
 
+export type FileSystemPermissionMode = 'read' | 'readwrite';
+
 /**
  * Saves a file to disk.
  * @returns Optional file handle to save in place.
@@ -166,6 +168,8 @@ export function directoryOpen(options?: {
   startIn?: WellKnownDirectory | FileSystemHandle;
   /** By specifying an ID, the user agent can remember different directories for different IDs. */
   id?: string;
+  /** By specifying a mode of `'readwrite'`, you can open a directory with write access. */
+  mode?: FileSystemPermissionMode;
   /** Callback to determine whether a directory should be entered, return `true` to skip. */
   skipDirectory?: (
     entry: FileSystemDirectoryEntry | FileSystemDirectoryHandle

package.json

@@ -1,6 +1,6 @@
 {
   "name": "browser-fs-access",
-  "version": "0.30.2",
+  "version": "0.31.0",
   "description": "File System Access API with legacy fallback in the browser.",
   "type": "module",
   "source": "./src/index.js",
@@ -49,7 +49,7 @@
   },
   "homepage": "https://github.com/GoogleChromeLabs/browser-fs-access#readme",
   "devDependencies": {
-    "eslint": "^8.18.0",
+    "eslint": "^8.19.0",
     "eslint-config-google": "^0.14.0",
     "eslint-config-prettier": "^8.5.0",
     "http-server": "^14.1.1",

src/fs-access/directory-open.mjs

@@ -54,9 +54,11 @@ const getFiles = async (
  */
 export default async (options = {}) => {
   options.recursive = options.recursive || false;
+  options.mode = options.mode || 'read';
   const handle = await window.showDirectoryPicker({
     id: options.id,
     startIn: options.startIn,
+    mode: options.mode,
   });
   return getFiles(handle, options.recursive, undefined, options.skipDirectory);
 };