[BUG]: stdout.write breaks build_runner output

[davidmorgan]

Is there an existing issue for this?

• I have searched the existing issues

Version

No response

Command type

build_runner (Default)

What happened?

As discussed on the build_runner discussions forum here

dart-lang/build#3834 (reply in thread)

if you use flutter_gen_runner then it causes duplicate output to appear in build_runner's log output. In the example linked, the two lines immediately after the [FlutterGen] lines are duplicated.

This is because stdout.write bypasses build_runner and writes directly to the console, which breaks build_runner's use of ANSI control codes to rewrite previous lines.

Would it be possible to change it to using print or log?

Thanks!

Relevant a pubspec.yaml.

Relevant log output

Compiling the build script.                                                                                                                                       
[FlutterGen] v5.9.0 Loading ...
[FlutterGen] Reading options from pubspec.yaml
61s freezed on 3993 inputs: 4 output, 776 same, 3213 no-op; spent 28s resolving, 23s analyzing, 6s building, 3s sdk                                               
222s json_serializable on 7986 inputs: 3213 skipped, 473 output, 4300 no-op; spent 182s resolving, 31s analyzing, 8s building                                     
61s freezed on 3993 inputs: 4 output, 776 same, 3213 no-op; spent 28s resolving, 23s analyzing, 6s building, 3s sdk                                               
222s json_serializable on 7986 inputs: 3213 skipped, 473 output, 4300 no-op; spent 182s resolving, 31s analyzing, 8s building                                     
0s build_runner_dart_flags on 2 inputs: 2 output

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[AlexV525]

@davidmorgan Could you test with #694 and see if it works?