Method subscribe

lib/diagnostics_channel.js:369–376

(handlers)

  }

  subscribe(handlers) {
    for (let i = 0; i < boundedEvents.length; ++i) {
      const name = boundedEvents[i];
      if (!handlers[name]) continue;

      this[name]?.subscribe(handlers[name]);
    }
  }

  unsubscribe(handlers) {
    let done = true;