# ConsolePrintStream constructor

ConsolePrintStream([

1. IOSink? sink

])

A concrete implementation of PrintStream that writes to the console using stdout.

`ConsolePrintStream` provides a high-level abstraction over `stdout`, offering utility methods like `write`, `writeln`, `newline`, `flush`, and `close`.

By default, it uses `stdout.nonBlocking` for efficient, non-blocking output, but you can also provide a custom IOSink to redirect output (e.g., to a file).

### 📦 Example Usage:

    final stream = ConsolePrintStream();
    stream.write('Hello');
    stream.writeln(' world');
    stream.newline();
    stream.flush();
    await stream.close();

This class is useful when abstracting over console or file output in logging systems, REPLs, shell interfaces, and testable I/O components.

Creates a ConsolePrintStream that writes to stdout by default.

You may optionally provide a custom `sink` (e.g., file or socket).

## Implementation

    ConsolePrintStream([IOSink? sink]) : _sink = sink ?? stdout.nonBlocking;