Function asyncCallback

docs/app/js/sanddance-app.js:107193–107199

* Invoke and await a potentially async callback function. If * an error occurs, trap it and route to Dataflow.error. * @param {Dataflow} df - The dataflow instance * @param {function} callback - A callback function to invoke * and then await. The dataflow will be passed as the single * argu

(df, callback)

 *   and then await. The dataflow will be passed as the single
 *   argument to the function.
 */ async function asyncCallback(df, callback) {
    try {
        await callback(df);
    } catch (err) {
        df.error(err);
    }
}
const TUPLE_ID_KEY = Symbol("vega_id");
let TUPLE_ID = 1;
/**