docs: function generate( arr, comment, _indent ) {
      try {
          const indent = typeof _indent !== "undefined" ? _indent : "  ";
          if ( arr.length === 0 ) return "";
          let out = '';
          if ( comment && comment.length > 0 ) {
              let
                  len = comment.length + 3,
                  dashes = '';
              while ( len-- > 0 ) dashes += "-";
              out += `${indent}//${dashes}\n${indent}// ${comment}.\n`;
          }
          arr.forEach( function ( line ) {
              if ( Array.isArray( line ) ) {
                  out += generate( line, null, `  ${indent}` );
              } else {
                  out += `${indent}${line}\n`;
              }
          } );
          return out;
      } catch ( ex ) {
          throw ex + "\n...in generate: " + JSON.stringify( comment );
      }
  }