Method constructor

resources/vega.min.js:14094–14099

(t)

  }
  class Ky {
    constructor(t) {
      arguments.length
        ? (this.root = Zy(t))
        : ((this.root = tv({ marktype: "group", name: "root", role: "frame" })),
          (this.root.items = [new Jg(this.root)]));
    }
    toJSON(t) {
      return Jy(this.root, t || 0);
    }