Method traceCallback

lib/diagnostics_channel.js:592–627

(fn, position = -1, context = kEmptyObject, thisArg, ...args)

  }

  traceCallback(fn, position = -1, context = kEmptyObject, thisArg, ...args) {
    if (!this.hasSubscribers) {
      return ReflectApply(fn, thisArg, args);
    }

    const { error } = this;
    const continuationWindow = this.#continuationWindow;

    function wrappedCallback(err, res) {
      if (err) {
        context.error = err;
        error.publish(context);
      } else {
        context.result = res;
      }

      // Use continuation window for asyncStart/asyncEnd around callback
      // eslint-disable-next-line no-unused-vars
      using scope = continuationWindow.withScope(context);
      return ReflectApply(callback, this, arguments);
    }

    const callback = ArrayPrototypeAt(args, position);
    validateFunction(callback, 'callback');
    ArrayPrototypeSplice(args, position, 1, wrappedCallback);

    // eslint-disable-next-line no-unused-vars
    using scope = this.#callWindow.withScope(context);
    try {
      return ReflectApply(fn, thisArg, args);
    } catch (err) {
      context.error = err;
      error.publish(context);
      throw err;
    }
  }
}

function tracingChannel(nameOrChannels) {