How to use the @lumino/domutils.Platform.IS_MAC function in @lumino/domutils

if (this.isDisposed) {
        return;
      }
      this.session.send({
        type: 'stdin',
        content: [data]
      });
    });

    term.onTitleChange((title: string) => {
      this.title.label = title;
    });

    // Do not add any Ctrl+C/Ctrl+V handling on macOS,
    // where Cmd+C/Cmd+V works as intended.
    if (Platform.IS_MAC) {
      return;
    }

    term.attachCustomKeyEventHandler(event => {
      if (event.ctrlKey && event.key === 'c' && term.hasSelection()) {
        // Return so that the usual OS copy happens
        // instead of interrupt signal.
        return false;
      }

      if (event.ctrlKey && event.key === 'v' && this._options.pasteWithCtrlV) {
        // Return so that the usual paste happens.
        return false;
      }

      return true;

function normalizeKeys(options: IKeyBindingOptions): string[] {
    let keys: string[];
    if (Platform.IS_WIN) {
      keys = options.winKeys || options.keys;
    } else if (Platform.IS_MAC) {
      keys = options.macKeys || options.keys;
    } else {
      keys = options.linuxKeys || options.keys;
    }
    return keys.map(normalizeKeystroke);
  }