please add an option to `File.writeAsBytes` to avoid overwriting.

[stephane-archer]

var outputFile = File("a.jpg");
if (!outputFile.exist()) {
    // another program creates a.jpg
    await outputFile.writeAsBytes(jpegData); // boom overwrite!!!
}

please add an option to File.writeAsBytes to avoid overwriting.

maybe something like await outputFile.writeAsBytes(jpegData, exclusive: true);

[dart-github-bot]

Summary: User requests File.writeAsBytes option to prevent overwriting existing files, avoiding data loss in concurrent scenarios. Proposed solution: exclusive flag.

[julemand101]

What behavior do you expect in case the file already exists? Throw exception?

[stephane-archer]

@julemand101 yes

[aam]

Have you looked at https://api.dart.dev/dart-io/File/create.html which allows you to specify exclusive: true to ensure new file is created, get PathExistsException if file already exists?