Function signalRef

docs/app/js/sanddance-app.js:149662–149666

(s)

        return this.signals[name];
    },
    signalRef (s) {
        if (this.signals[s]) return ref(this.signals[s]);
        else if (!(0, _vegaUtil.hasOwnProperty)(this.lambdas, s)) this.lambdas[s] = this.add(operator(null));
        return ref(this.lambdas[s]);
    },
    parseLambdas () {
        const code = Object.keys(this.lambdas);
        for(let i = 0, n = code.length; i < n; ++i){