predicate = t => {
    if (only.length > 0) {
      return only.indexOf(t) !== -1;
    }
    if (skipped.length > 0) {
      return skipped.indexOf(t) === -1;
    }
    return true;
  }
A string template tag that removes padding from the left side of multi-line strings
@param {Array} strings array of code strings (only one expected)