How to use the tty.isatty function in tty

var tty = require('tty');
var chalk = require('chalk');

var enabled = process.env.COLOR || (!process.env.NOCOLOR && tty.isatty(1) && tty.isatty(2));

module.exports = new chalk.constructor({ enabled: enabled });

internals.color = function (name, code, forceColor) {

    if ((Tty.isatty(1) && Tty.isatty(2)) || forceColor) {
        var color = '\u001b[' + code + 'm';
        return function (text) { return color + text + '\u001b[0m'; };
    }

    return function (text) { return text; };
};

function readCachedConfig(cwd) {
    if (cachedConfigs[cwd]) { return cachedConfigs[cwd]; }

    var config = cachedConfigs[cwd] = normalise(rc('nodesvm', defaults, cwd));

    if (!_o.has(config, 'interactive')) {
        config.interactive = (process.bin === 'node-svm' && tty.isatty(1) && !process.env.CI);
    }

    return config;
}
function resetCache () {

write(output, json = false) {
    if (this.outputPath) {
      fs.writeFileSync(this.outputPath, output);
    } else if (isatty(process.stdout.fd) && json) {
      const highlighted = highlight(output, { json: true, theme });
      process.stdout.write(highlighted);
    } else {
      process.stdout.write(output);
    }
  }
}

function getMaxWidth () {
  var cols
  try {
    var tty = require('tty')
    var stdout = process.stdout
    cols = !tty.isatty(stdout.fd) ? Infinity : process.stdout.getWindowSize()[0]
    cols = (cols === 0) ? Infinity : cols
  } catch (ex) { cols = Infinity }
  return cols
}

function getMaxWidth() {
  var cols
  try {
    var tty = require("tty")
      , stdout = process.stdout
    cols = !tty.isatty(stdout.fd) ? Infinity : process.stdout.getWindowSize()[0]
    cols = (cols === 0) ? Infinity : cols
  } catch (ex) { cols = Infinity }
  return cols
}

function isatty(stream) {
  if (!tty.isatty) {
    return true;
  }
  if (!stream) {
    return false;
  }
  if (stream.isTTY) {
    return true;
  }
  if (stream && (typeof stream.fd === "number")) {
    stream.isTTY = tty.isatty(stream.fd);
  }
  return stream.isTTY;
}