code: public final ProjectionJavaScriptBuilder type(final String eventType) {
          if (count > 0) {
              sb.append(",");
          }
          sb.append("'" + eventType + "': function(state, ev) { linkTo('" + projection + "', ev); }");
          count++;
          return this;
      }
docs: Adds another type to select.
  
  @param eventType
  Unique event type to select from the category of streams.
  
  @return this.