terminalColumns property
The number of columns of the terminal.
If no terminal is attached to stdout, a StdoutException is thrown. See hasTerminal for more info.
Implementation
int get terminalColumns => _terminalColumns(_fd);© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-io/Stdout/terminalColumns.html