整理した

src/client/app/desktop/api/choose-drive-folder.ts

@@ -0,0 +1,17 @@
+import MkChooseFolderFromDriveWindow from '../views/components/choose-folder-from-drive-window.vue';
+
+export default function(opts) {
+	return new Promise((res, rej) => {
+		const o = opts || {};
+		const w = new MkChooseFolderFromDriveWindow({
+			propsData: {
+				title: o.title,
+				initFolder: o.currentFolder
+			}
+		}).$mount();
+		w.$once('selected', folder => {
+			res(folder);
+		});
+		document.body.appendChild(w.$el);
+	});
+}