appium-flutter-driver/lib/commands/screen.ts

Appium Flutter driver

import type {FlutterDriver} from '../driver';
import {IsolateSocket} from '../sessions/isolate_socket';

export const getScreenshot = async function (this: FlutterDriver) {
  const response = (await (this.socket as IsolateSocket).call(`_flutter.screenshot`)) as any;
  return response.screenshot;
};