lib/index.js
function build(writable, options) {
  return writable && writable._ansi2 || (writable._ansi2 = new Ansi(writable, options))
}
function build(writable, options) {
  return writable && writable._ansi2 || (writable._ansi2 = new Ansi(writable, options))
}
function build ( writable , options ) { return writable && writable . _ansi2 || ( writable . _ansi2 = new Ansi ( writable , options ) ) }
return one we already made or make a new one
return one we already made or make a new one