Fix: "Warning: Operand Of Null-aware Operation '!' Has Type 'SchedulerBinding' Which Excludes Null" 2023

Are you getting “Warning: Operand of null-aware operation ‘!’ has type ‘SchedulerBinding’ which excludes null“, looking for the reason and fix of this warning then you are at right article.

Here, we will explain why “Warning: Operand of null-aware operation ‘!’ has type ‘SchedulerBinding’ which excludes null” occurred and how to fix it.

First of all. “Warning: Operand of null-aware operation ‘!’ has type ‘SchedulerBinding’ which excludes null” is not a error , it a warning.

Your App will compile and run without any issue.

Why “Warning: Operand of null-aware operation ‘!’ has type ‘SchedulerBinding’ which excludes null” Occurred?

When you migrating to Flutter 3, then you might see warning like this:

Warning: Operand of null-aware operation ‘!’ has type ‘SchedulerBinding’ which excludes null.

These are caused by a simplification of the API (the instance property on bindings is now non-nullable), combined with an eager compiler that wants to report any case where redundant null-aware operators (such as ! and ?.) that are used when they’re not necessary.

How to Fix “Warning: Operand of null-aware operation ‘!’ has type ‘SchedulerBinding’ which excludes null”?

If the problem refers to your own code, you can update it by running dart fix --apply. This should resolve all the warnings.

Fix 1: By Running dart fix –apply

If the problem refers to your own code, you can update it by running dart fix --apply. This should resolve all the warnings.

Fix 2: Update Your Package

If your dependencies use bindings, they might need updating to silence the warnings. Your builds should be unaffected except for the verbose warnings.

You can update your packages by running flutter pub upgrade.

flutter pub upgrade

Fix 3: Either Ignore OR remove `?` and/or `!`

If you need your code to support both Flutter 3 and earlier versions (maybe because your code is a library), then you can wrap calls to binding.instance with calls to a method such as the following:

/// This allows a value of type T or T?
/// to be treated as a value of type T?.
///
/// We use this so that APIs that have become
/// non-nullable can still be used with `!` and `?`
/// to support older versions of the API as well.
T? _ambiguate<T>(T? value) => value;

For example, instead of the following:

SchedulerBinding.instance!.addPostFrameCallback(...);

You can use:

_ambiguate(SchedulerBinding.instance)!.addPostFrameCallback(...);

When you no longer need to support versions of Flutter before 3.0.0, you can remove this and replace it with the following:

SchedulerBinding.instance.addPostFrameCallback(...);

Because SchedulerBinding.instance had the type SchedulerBinding?, which may (technically) be null.

Since in practice, the ! operator was used, it was already assumed to not be null, and with the new changes in the SDK, they changed the type so it actually can never be null.

If you still include the ! or ? operators, your IDE will warn you, that this is a redundant check, as the instance can never be null.

Unfortunately, we’ll be stuck with these warnings until the packages you use and Flutter itself solve this, but you can definitely ignore them, as a unnecessary null check will never break your code

Fix 4: File A Bug

If the error messages do not point to one of your dependencies, and dart fix --apply doesn’t fix the issue, or if the warnings are fatal (for example, your application refuses to run), please file a bug.

Conclusion

Now, we have explained about “Warning: Operand of null-aware operation ‘!’ has type ‘SchedulerBinding’ which excludes null” warning. Why this warning occurred and how to resolve this.

Hope , this provide a solution of your problem.

Source: https://flutter.dev/

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