Function activate

docs/app/js/sanddance-app.js:117180–117182

(flow)

}
(0, _vegaUtil.inherits)(Facet, (0, _vegaDataflow.Transform), {
    activate (flow) {
        this._targets[this._targets.active++] = flow;
    },
    // parent argument provided by PreFacet subclass
    subflow (key, flow, pulse, parent) {
        const flows = this.value;