code: function StyleCache_ctor(id, desc, style) {
              this.cref = 0;
              this.id = id;
              this.desc = desc;
              this.removed = {};
              this.prevStyles = desc.props.map(function (p) { return style[p[0]]; });
              this.prevNames = this.names = style[desc.nameProp];
              desc.styleCaches[id] = this;
          }
docs: Constructor