compres image flutter dart

ImageCompres.dart

import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:image/image.dart' as Im;
import 'package:path_provider/path_provider.dart' show getTemporaryDirectory;

Future<File> imageCompress(File file,{int maxFileSize = 3}) async {
  Im.Image image = Im.decodeImage( file.readAsBytesSync());
  Im.Image smallerImage = Im.copyResize(image, width: image.width ~/ 2);
  final appPath = await getTemporaryDirectory();
  file = File('${appPath.path}/img_c${DateTime.now().millisecondsSinceEpoch}.jpg')
    ..writeAsBytesSync(Im.encodeJpg(smallerImage, quality: 70));
  if (file.fileSizeInMB >= maxFileSize) {
    Im.Image smallerImage2 =
    Im.copyResize(image, width: smallerImage.width ~/ 2);
    file =File(
        '${appPath.path}/img_c${DateTime.now().millisecondsSinceEpoch}c.jpg')
      ..writeAsBytesSync(Im.encodeJpg(smallerImage2, quality: 70));
}
  return file;
}

extension FileExtension on File {
  get fileSizeInKB {
    if (kIsWeb) {
      return this.length();
    } else {
      return this.lengthSync() / 1024;
    }
  }

  String get name {
    return this?.path?.split("/")?.last;
  }
  
  String get extType {
    return this?.path?.split("/")?.last?.split(".")?.last?.toLowerCase();
  }

  get fileSizeInMB {
    if (kIsWeb) {
      this.length();
    } else {
      return fileSizeInKB / 1024;
    }
  }
}