lazy parameter missing from type hints for event(), message(), etc.

[quicksilversel]

Reproducible in:

The slack_bolt version

slack-bolt==1.26.0
slack-sdk==3.34.0

Python runtime version

Python 3.12.0

OS info

ubuntu-latest (but reproducible on any OS)

Steps to reproduce:

1. Create a file with a lazy listener:

from slack_bolt import App

app = App(token="xoxb-xxx", signing_secret="xxx")

def process_mention(event, say, logger):
    say("Hello!")

@app.event("app_mention", lazy=[process_mention])
def handle_mention():
    pass

2. Run mypy:

mypy your_file.py

3. Observe error

Expected result:

No mypy error. The lazy parameter is a valid, documented feature and should be included in the type signature.

Actual result:

your_file.py:9: error: Unexpected keyword argument "lazy" for "event" of "App"  [call-arg]

Root cause: The lazy parameter is handled via **kwargs in the inner call function (app.py line 846), but it's not declared in the event() method signature. Same issue affects message(), action(), command(), etc.

Suggested fix: Add lazy to the method signatures:

def event(
    self,
    event: ...,
    matchers: ... = None,
    middleware: ... = None,
    lazy: Optional[Sequence[Callable[..., Optional[BoltResponse]]]] = None,
) -> ...:

Requirements

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