Method tracePromise

lib/diagnostics_channel.js:537–590

(fn, context = { __proto__: null }, thisArg, ...args)

  }

  tracePromise(fn, context = { __proto__: null }, thisArg, ...args) {
    if (!this.hasSubscribers) {
      const result = ReflectApply(fn, thisArg, args);
      if (typeof result?.then !== 'function') {
        emitNonThenableWarning(fn);
      }
      return result;
    }

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

    function reject(err) {
      context.error = err;
      error.publish(context);
      // Use continuation window for asyncStart/asyncEnd
      // eslint-disable-next-line no-unused-vars
      using scope = continuationWindow.withScope(context);
      // TODO: Is there a way to have asyncEnd _after_ the continuation?
      return PromiseReject(err);
    }

    function resolve(result) {
      context.result = result;
      // Use continuation window for asyncStart/asyncEnd
      // eslint-disable-next-line no-unused-vars
      using scope = continuationWindow.withScope(context);
      // TODO: Is there a way to have asyncEnd _after_ the continuation?
      return result;
    }

    // eslint-disable-next-line no-unused-vars
    using scope = this.#callWindow.withScope(context);
    try {
      const result = ReflectApply(fn, thisArg, args);
      // If the return value is not a thenable, return it directly with a warning.
      // Do not publish to asyncStart/asyncEnd.
      if (typeof result?.then !== 'function') {
        emitNonThenableWarning(fn);
        context.result = result;
        return result;
      }
      // For native Promises use PromisePrototypeThen to avoid user overrides.
      if (isPromise(result)) {
        return PromisePrototypeThen(result, resolve, reject);
      }
      // For custom thenables, call .then() directly to preserve the thenable type.
      return result.then(resolve, reject);
    } catch (err) {
      context.error = err;
      error.publish(context);
      throw err;
    }
  }

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