index.js

exports.instance = serializeInstance;
exports.args = serializeArgs;
exports.value = serializeValue;

function serializeInstance(instance) {
  var args = Array.prototype.slice.call(arguments, 1);
  return 'new ' + instance.module + '.' + instance.type +
    '(' + serializeArgs(args) + ')';
}

function serializeArgs(args) {
  // Map each argument into its string representation
  var items = [];
  for (var i = args.length; i--;) {
    var item = serializeValue(args[i]);
    items.unshift(item);
  }
  // Remove trailing null values, assuming they are optional
  for (var i = items.length; i--;) {
    var item = items[i];
    if (item !== 'void 0' && item !== 'null') break;
    items.pop();
  }
  return items.join(', ');
}

function serializeValue(input) {
  if (input && input.serialize) {
    return input.serialize();

  } else if (typeof input === 'undefined') {
    return 'void 0';

  } else if (input === null) {
    return 'null';

  } else if (typeof input === 'string') {
    return formatString(input);

  } else if (typeof input === 'number' || typeof input === 'boolean') {
    return input + '';

  } else if (Array.isArray(input)) {
    var items = [];
    for (var i = 0; i < input.length; i++) {
      var value = serializeValue(input[i]);
      items.push(value);
    }
    return '[' + items.join(', ') + ']';

  } else if (typeof input === 'object') {
    var items = [];
    for (var key in input) {
      var value = serializeValue(input[key]);
      items.push(formatString(key) + ': ' + value);
    }
    return '{' + items.join(', ') + '}';
  }
}
function formatString(value) {
  var escaped = value.replace(/['\r\n\\]/g, function(match) {
    return (match === '\'') ? '\\\'' :
      (match === '\r') ? '\\r' :
      (match === '\n') ? '\\n' :
      (match === '\\') ? '\\\\' :
      '';
  });
  return '\'' + escaped + '\'';
}