Avoid `print` calls in production code while using flutter

Question

My code keeps giving me a warning... Avoid print calls in production code.

How do I resolve it?

Solution 1

Use debugPrint instead. Just know that debugPrint can only take a String? so you might need to use toString() or correctly format the data you are trying to display.

import 'package:flutter/foundation.dart';

debugPrint('This is a debugPrint');

Solution 2

Print() is a function which helps you in debugging process, it's not a good idea to use it unconditionally, you may leak some sensitive information in Release version of your app

It's better to make sure that you're using this function in Debug mode

There are some options:

Using debugPrint() instead of print()

debugPrint('some debug info ...')

Using assert() function which will be called in Debug mode only

  assert(() {
    print('some debug info ...');
    return true;
  });

Checking Debug Mode before using print()

import 'package:flutter/foundation.dart';
...
  if (kDebugMode) {
    print('some debug info ...');
  }

If you're sure that you have enough control on using print() function, you can ignore that warning by using ignore directive :

Use this on top of the file : // ignore_for_file: avoid_print

Or add this line before print() function

// ignore: avoid_print
print('some debug info ...');

To ignore that warning for the whole project, you can add this lines to analysis_options.yaml file of the project :

include: package:flutter_lints/flutter.yaml

linter:
  rules:
    avoid_print: false

Solution 3

You can use print statement in only debug mode when app run in release mode print statement avoid. Write print using below both method:-

import 'package:flutter/foundation.dart';

if (kDebugMode) {
      print("Hello");
    }

OR

debugPrint('This is a debugPrint');

Comments

[nvoigt]

Don't use print statements then? I'm really not sure how this is a real question.

[lbarqueira]

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