Function findOperatorHandler

docs/app/js/sanddance-app.js:142493–142496

(op1, handler)

    return (0, _vegaUtil.hasOwnProperty)(view._signals, name) ? view._signals[name] : (0, _vegaUtil.error)("Unrecognized signal name: " + (0, _vegaUtil.stringValue)(name));
}
function findOperatorHandler(op1, handler) {
    const h = (op1._targets || []).filter((op)=>op._update && op._update.handler === handler);
    return h.length ? h[0] : null;
}
function addOperatorListener(view, name, op, handler) {
    let h = findOperatorHandler(op, handler);
    if (!h) {