Function handler

resources/vega-embed.min.js:1829–1836

(e, t)

      return (e) => Me(n, r, void 0, void 0, e);
    },
    handler(e, t) {
      const n = t.ast,
        r = e.functions;
      return (e, t) => {
        const i = t.item && t.item.datum;
        return Me(n, r, e, i, t);
      };
    },
    encode(e, t) {
      const { marktype: n, channels: r } = t,
        i = e.functions,