Method assemble

resources/vega-lite.min.js:10429–10467

()

      return `WindowTransform ${d(this.transform)}`;
    }
    assemble() {
      const e = [],
        t = [],
        n = [],
        i = [];
      for (const r of this.transform.window)
        (t.push(r.op),
          n.push(this.getDefaultName(r)),
          i.push(void 0 === r.param ? null : r.param),
          e.push(void 0 === r.field ? null : r.field));
      const r = this.transform.frame,
        o = this.transform.groupby;
      if (r && null === r[0] && null === r[1] && t.every((e) => sn(e)))
        return {
          type: "joinaggregate",
          as: n,
          ops: t,
          fields: e,
          ...(void 0 !== o ? { groupby: o } : {}),
        };
      const a = [],
        s = [];
      if (void 0 !== this.transform.sort)
        for (const e of this.transform.sort)
          (a.push(e.field), s.push(e.order ?? "ascending"));
      const l = { field: a, order: s },
        c = this.transform.ignorePeers;
      return {
        type: "window",
        params: i,
        as: n,
        ops: t,
        fields: e,
        sort: l,
        ...(void 0 !== c ? { ignorePeers: c } : {}),
        ...(void 0 !== o ? { groupby: o } : {}),
        ...(void 0 !== r ? { frame: r } : {}),
      };
    }
  }
  function em(e) {
    if (e instanceof Dd)