Bolt v4
What's Changed
New Features
Support for Agents & Assistants is now available!
Bolt now offers a simple and intuitive way to create an Agent/Assistant using the new Assistant class. Simply include the required callbacks and add the assistant to your App instance. Get up and running even quicker with a working, out-of-the-box example that utilizes OpenAI here.
Breaking Changes
We have prepared a migration guide to help BoltJS consumers migrate their Bolt v3 apps to v4.
While a few breaking changes were introduced, we don't expect a majority of bolt v3 users to require changing their apps to upgrade to v4. More complex apps may need a few tweaks. TL;DR is: if your bolt v3 app is built with TypeScript, or uses the ExpressReceiver or the AwsLambdaReceiver, or your app used previously-deprecated types or functions, best to read the migration guide.
Middleware Type Changes
In bolt we have a set of Slack*MiddlewareArgs types: for events, shortcuts, commands, and so on. They 'wrap' the underlying event payloads with additional middleware-relevant bits like a next() method, a context object for devs to augment, and so on.
Many of these types, for example the SlackEventMiddlewareArgs type, previously used a conditional to sometimes define particular additional helper utilities on the middleware arguments. For example, the say utility, or tacking on a convenience message property for message-event-related payloads. This was problematic in practice in TypeScript situations, not just internally (this change fixes https://github.com/slackapi/bolt-js/issues/2135) within the bolt codebase but for developers as well: when the payload was not of a type that required the extra utility, these properties would be required to exist on the middleware arguments but have a value of undefined. Those of us trying to build generic middleware utilities would have to deal with TS compilation errors and needing to liberally type-cast to avoid these conditional mismatches with undefined.
Instead, these MiddlewareArgs types now conditionally create a type intersection when appropriate in order to provide this conditional-utility-extension mechanism. In practice that looks something like:
type SomeMiddlewareArgs<EventType extends string = string> = {
// some type in here
} & (EventType extends 'message'
// If this is a message event, add a `message` property
? { message: EventFromType<EventType> }
: unknown
)
With the above, now when a message payload is wrapped up into middleware arguments, it will contain an appropriate message property, whereas a non-message payload will be intersected with unknown - effectively a type "noop." No more e.g. say: undefined or message: undefined to deal with!
Other Breaking Changes
- drops node v14 and v16 (are now EOL'ed)
express to v4->v5; ExpressReceiver users will be exposed to express v4 -> v5 breaking changes - fixes #2242- upgrades to
@slack/socket-mode v2; SocketModeReceiver users who have attached custom event listeners to the public socketModeClient directly should read the v1 -> v2 migration guide in case the major upgrade could affect them - fixes #2225
- upgrades
@slack/web-api v7; all users should read the web-api v6->v7 migration guide to see what the scope of breaking changes the client within listeners is affected by
- removed exported type:
KnownKeys
@slack/types now exist under a named export types.- removed the
SocketModeFunctions class that had a single static method on it and instead directly exposed the defaultProcessEventErrorHandler method from it.
- the built-in middleware functions
ignoreSelf and directMention now no longer must be invoked as a method in order to return middleware; instead they are middleware to be used directly. this lines up the API for these built-in middlewares to match the other builtins.
- AWSReceiver's
AwsEvent interface now models event payloads a bit differently; we now properly model AWS API Gateway v1 and v2 payloads separately - fixes #2272
- remove deprecated methods/modules/properties:
OptionsRequest interfaceauthed_users and authed_teams from event payload enveloperender-html-for-install-path moduleverify and VerifyOptions from the verify-request modulesrc/receivers/http-utils.ts module
Non-breaking Changes
- expose the bundled
@slack/web-api dependency under the webApi named export
- fixed an issue in
AwsLambdaReceiver where apps with no registered handlers that processed an incoming event would still log out an error related to not acknowledging the request in time - fixes #2284
- dependency updates:
- upgrades
raw-body to v3
- upgrades
@slack/oauth to v3
- removes
promise.allsettled since that is natively supported in node since v14
- moves
@types/tsscmp to dev dependencies since that is not exposed to developers
Changelog
Full Changelog: https://github.com/slackapi/bolt-js/compare/@slack/bolt@3.22.0...@slack/bolt@4.0.0
slackapi/bolt
