Function collectSignals

docs/app/js/sanddance-app.js:149422–149442

* Collect top-level signals, merging values as needed. Signals * defined in the config signals arrays are added only if that * signal is not explicitly defined in the specification. * Built-in signals (autosize, background, padding, width, height) * receive special treatment. They are initialize

(spec, config)

 * will be merged with the built-in specification, potentially
 * overwriting existing 'value' or 'update' properties.
 */ function collectSignals(spec, config) {
    const _ = (name)=>value(spec[name], config[name]), signals = [
        signalObject("background", _("background")),
        signalObject("autosize", parseAutosize(_("autosize"))),
        signalObject("padding", parsePadding(_("padding"))),
        signalObject("width", _("width") || 0),
        signalObject("height", _("height") || 0)
    ], pre = signals.reduce((p, s)=>(p[s.name] = s, p), {}), map = {}; // add spec signal array
    (0, _vegaUtil.array)(spec.signals).forEach((s)=>{
        if ((0, _vegaUtil.hasOwnProperty)(pre, s.name)) // merge if built-in signal
        s = (0, _vegaUtil.extend)(pre[s.name], s);
        else // otherwise add to signal list
        signals.push(s);
        map[s.name] = s;
    }); // add config signal array
    (0, _vegaUtil.array)(config.signals).forEach((s)=>{
        if (!(0, _vegaUtil.hasOwnProperty)(map, s.name) && !(0, _vegaUtil.hasOwnProperty)(pre, s.name)) // add to signal list if not already defined
        signals.push(s);
    });
    return signals;
}
function Scope(config, options) {
    this.config = config || {};
    this.options = options || {};