WebhookTimeoutError and Debugging

Principle

WebhookTimeoutError is thrown when waitFor or waitForCount does not find a matching webhook within the configured timeout. It carries a snapshot of received webhooks from the last polling cycle — truncated to the last 10 entries — so you can inspect what arrived vs. what was expected. The full count of all received webhooks is available in totalReceived.

Error Properties

class WebhookTimeoutError extends Error {
  readonly name = 'WebhookTimeoutError';
  readonly templateName: string; // from webhookTemplate('...')
  readonly timeoutMs: number; // the timeout that was exceeded
  readonly totalReceived: number; // total webhooks seen in polling window
  readonly receivedWebhooks: ReceivedWebhook[]; // last ≤10 received webhooks
  readonly matcherDetails: string[]; // human-readable matcher summary

  toJSON(): Record<string, unknown>; // serialize all fields for CI logs
}

receivedWebhooks is capped at the last 10 entries. If more than 10 webhooks arrived, totalReceived shows the full count but receivedWebhooks contains only the most recent 10.

Reading the Error

The error message format:

Webhook "movie.deleted" not received within 15000ms.
3 webhook(s) were received but none matched.
Matchers: field(event="movie.deleted"), field(data.id=42).

Use matcherDetails to confirm the matchers were configured correctly. Use receivedWebhooks to inspect actual payloads — compare field paths and values against what the matchers expect.

Validating the Error Shape in Tests

import { WebhookTimeoutError, webhookTemplate } from '@seontechnologies/playwright-utils/webhook';

const neverArrivingTemplate = webhookTemplate('never.arrives')
  .matchField('event', 'event.that.never.happens')
  .withTimeout(500)
  .withInterval(100)
  .build();

const [waitResult] = await Promise.allSettled([webhookRegistry.waitFor(neverArrivingTemplate)]);

expect(waitResult.status).toBe('rejected');
if (waitResult.status !== 'rejected') {
  throw new Error('Expected webhook wait to reject with WebhookTimeoutError');
}

const error = waitResult.reason as WebhookTimeoutError;
expect(error).toBeInstanceOf(WebhookTimeoutError);
expect(error.templateName).toBe('never.arrives');
expect(error.timeoutMs).toBe(500);
expect(error.toJSON()).toMatchObject({
  name: 'WebhookTimeoutError',
  templateName: 'never.arrives',
  timeoutMs: 500,
  totalReceived: expect.any(Number),
  matcherDetails: ['field(event="event.that.never.happens")'],
});

Inspecting receivedWebhooks

When a webhook arrives but doesn’t match, receivedWebhooks shows you what actually came in:

// Wait for create webhook first — puts it in the journal
await webhookRegistry.waitFor(movieCreated(movieId));

// Wait for delete webhook that will never arrive — no delete was called
const undeliveredDelete = webhookTemplate<{
  event: string;
  data: { id: number };
}>('movie.deleted.not.delivered')
  .matchField('event', 'movie.deleted')
  .matchField('data.id', movieId)
  .withTimeout(2_000)
  .withInterval(200)
  .build();

const [waitResult] = await Promise.allSettled([webhookRegistry.waitFor(undeliveredDelete)]);

expect(waitResult.status).toBe('rejected');
if (waitResult.status !== 'rejected') {
  throw new Error('Expected webhook wait to reject with WebhookTimeoutError');
}

const error = waitResult.reason as WebhookTimeoutError;
expect(error).toBeInstanceOf(WebhookTimeoutError);
expect(error.totalReceived).toBeGreaterThanOrEqual(1);

// The movie.created webhook that did arrive is visible in the error
const createdWebhook = error.receivedWebhooks.find((w) => (w.body as { data: { id: number } }).data.id === movieId);
expect(createdWebhook).toBeDefined();
expect((createdWebhook!.body as { event: string }).event).toBe('movie.created');

Common Failure Patterns

What you see	Likely cause	Fix
`totalReceived: 0`	Webhook not delivered; wrong URL or event not firing	Check application event publishing and webhook routing
`totalReceived > 0`, none match	Webhooks arriving but matchers not matching	Inspect `receivedWebhooks[0].body` — check field paths and values
`matcherDetails` shows wrong path	Template factory misconfigured	Print `error.toJSON()` and compare paths against actual payload
`totalReceived: 0` with `matched-only`	Another worker claimed and deleted the webhook first	Ensure template is scoped by entity ID
Parse error in body	Webhook body is not valid JSON	Check `receivedWebhooks[n].parseError` and `rawBody`

matcherDetails Format per Matcher Type

Matcher	matcherDetails string
`matchField('event', 'x')`	`field(event="x")`
`matchPartial({ a: 1 })`	`partial({"a":1})`
`matchPredicate('my desc', fn)`	`predicate(my desc)`

Import

import { WebhookTimeoutError } from '@seontechnologies/playwright-utils/webhook';

webhook-template-matchers.md — matcherDetails string format per matcher type
webhook-waiting-querying.md — waitFor and waitForCount throw this error on timeout

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