fc98c8c: Drop Node.js 18 support. The minimum supported Node.js version is now 20.
fc98c8c: Restructured error classes to use proper Error subclasses extending a new SlackWebhookError base class.

Breaking changes to IncomingWebhookHTTPError:

The original property has been removed. HTTP response details are now direct properties:
- statusCode: number
- statusMessage: string
- body: string
Migrate from error.original.response.status to error.statusCode, error.original.response.data to error.body, etc.

Breaking changes to IncomingWebhookRequestError:

The original property is now a standard Error (previously it was an AxiosError). The original error is also available via the standard cause property.

Removed factory functions (use new with the corresponding class instead):

requestErrorWithOriginal() → new IncomingWebhookRequestError(original)
httpErrorWithOriginal() → new IncomingWebhookHTTPError(statusCode, statusMessage, body)
errorWithCode() — Use the specific error class directly.

Migration: Replace if (error.code === ErrorCode.HTTPError) with if (error instanceof IncomingWebhookHTTPError). You can also catch all webhook errors with if (error instanceof SlackWebhookError).

The CodedError interface is deprecated — use instanceof checks with the SlackWebhookError base class or specific error subclasses instead.

fc98c8c: Replaced axios with the standard Fetch API for HTTP transport.

Removed options from IncomingWebhookDefaultArguments:

agent — Use the new fetch option to provide a custom fetch implementation with proxy or TLS support. For proxies, prefer the built-in http.setGlobalProxyFromEnv() or NODE_USE_ENV_PROXY=1 (Node.js 24+). For advanced use cases: ts import { fetch, Agent } from "undici"; const webhook = new IncomingWebhook(url, { fetch: (url, init) => fetch(url, { ...init, dispatcher: new Agent({ connect: { ca: myCA } }), }), });

The axios dependency has been removed. The default fetch implementation is globalThis.fetch (available in Node.js 20+). The timeout option remains available and is implemented via AbortController.

Minor Changes

fc98c8c: feat: add WebhookTrigger class for Workflow Builder triggers and opt-in retries for IncomingWebhook and WebhookTrigger

WebhookTrigger surfaces its own WebhookTriggerHTTPError and WebhookTriggerRequestError (subclasses of SlackWebhookError), so trigger failures can be distinguished from IncomingWebhook failures via instanceof.

Patch Changes

Updated dependencies [fc98c8c]
- @slack/types@3.0.0