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evt.enableTrace(...)

If you need help to track down a bug, you can use enableTrace to log what's going on with an Evt. Use evt.disableTrace() to stop logging.
import { Evt } from "evt";
{
const evtCircle = new Evt<Circle>();
evtCircle.enableTrace({ "id": "evtCircle n°1" });
evtCircle.post(circle1);
evtCircle.attachOnce(circle => {});
evtCircle.post(circle2);
}
console.log("\n");
//Optional arguments
{
const evtCircle = new Evt<Circle>();
evtCircle.enableTrace({
"id": "evtCircle n°2",
"formatter": circle => `CIRCLE(${circle.radius})`,
"log": (...args)=> console.log(...["[myPrefix]",...args])
// ^Log function default console log
);
evtCircle.attach(
({ radius }) => radius > 15,
circle => {}
);
evtCircle.post(circle1);
evtCircle.post(circle2);
}
This will print:
(evtCircle n°1) 0 handler, { "type": "CIRCLE", "radius": 12 }
(evtCircle n°1) 1 handler, { "type": "CIRCLE", "radius": 33 }
[myPrefix] (evtCircle n°2) 0 handler, CIRCLE(12)
[myPrefix] (evtCircle n°2) 1 handler, CIRCLE(33)