refactor(api/internal): initial 'showOpenFilePicker' and structure

api/index.d.ts

@@ -7249,7 +7249,7 @@ declare module "socket:internal/pickers" {
     /**
      * TODO
      */
-    export function showOpenFilePicker(options?: any): Promise<void>;
+    export function showOpenFilePicker(options?: any): Promise<any[]>;
     namespace _default {
         export { showOpenFilePicker };
     }

api/internal/pickers.js

@@ -0,0 +1,36 @@
+import application from '../application.js'
+import mime from '../mime.js'
+import path from '../path.js'
+import fs from '../fs/promises.js'
+
+/**
+ * TODO
+ */
+export async function showOpenFilePicker (options = null) {
+  const currentWindow = await application.getCurrentWindow()
+  const handles = []
+
+  const results = await currentWindow.showOpenFilePicker({
+    allowMultiple: options?.multiple === true,
+    allowFiles: true
+  })
+
+  for (const result of results) {
+    const stats = await fs.stat(result)
+    const types = await mime.lookup(path.extname(result).slice(1))
+    const file = new File([], result, {
+      lastModified: stats.mtimeMs,
+      type: types[0]?.mime ?? ''
+    })
+
+    handles.push(Object.create(FileSystemFileHandle.prototype, {
+      getFile: { value () { return file } }
+    }))
+  }
+
+  return handles
+}
+
+export default {
+  showOpenFilePicker
+}