code: function renderDefinitionRhs(val, indent) {
    indent = indent || 0;
    const indentStr = Array(indent + 1).join(' ');
  
    if (isUndefined(val)) {
      throw new Error('Undefined value in definition RHS.');
    }
    if (isBoolean(val)) {
      return val.toString();
    }
    if (isInteger(val)) {
      return val;
    }
    if (isString(val)) {
      return JSON.stringify(val);
    }
    if (isArray(val)) {
      return ['[', map(val, (elem) => `${indentStr}  ${JSON.stringify(elem)}`).join(',\n'), `${indentStr}]`].join('\n');
    }
    if (isObject(val)) {
      const rhsLines = exports.renderDefinition(val, indent + 2);
      const rhsStr = rhsLines;
      return `{
  ${rhsStr}
  ${indentStr}}`;
    }
  }
docs: Render the right-hand side of a definition.
  @param {*} val Value to render
  @param {?number} indent Number of spaces to indent.
  @return {string} Rendered RHS.