Function preload

docs/app/js/sanddance-app.js:107880–107887

(target, url, format)

    };
}
async function preload(target, url, format) {
    const df = this, pending = df._pending || loadPending(df);
    pending.requests += 1;
    const res = await df.request(url, format);
    df.pulse(target, df.changeset().remove((0, _vegaUtil.truthy)).insert(res.data || []));
    pending.done();
    return res;
}
function loadPending(df) {
    let accept;
    const pending = new Promise((a)=>accept = a);