Function addSignal

resources/vega.min.js:32726–32730

(t, e)

        return ut(this.signals, t);
      },
      addSignal(t, e) {
        this.hasOwnSignal(t) && s("Duplicate signal name: " + Dt(t));
        const n = e instanceof YN ? e : this.add(VN(e));
        return (this.signals[t] = n);
      },
      getSignal(t) {
        return (
          this.signals[t] || s("Unrecognized signal name: " + Dt(t)),