Fix #355: Fix type error with lifespan context#368
Merged
Conversation
The TypeVar LifespanContextT was incorrectly defined with a default=None, which caused type errors when using strongly typed custom context objects. This change properly propagates the type information from custom lifespans to request contexts.
Kludex
reviewed
Mar 25, 2025
|
|
||
| SessionT = TypeVar("SessionT", bound=BaseSession[Any, Any, Any, Any, Any]) | ||
| LifespanContextT = TypeVar("LifespanContextT", default=None) | ||
| LifespanContextT = TypeVar("LifespanContextT") |
Member
There was a problem hiding this comment.
But doesn't it makes sense to default to None on FastMCP context?
Member
Author
There was a problem hiding this comment.
FastMCP sets the default lifespan which yields and empty dictionary. There is actually never a None. This one defaults to Any, if default is not set, which I think is correct.
Kludex
approved these changes
Mar 25, 2025
Kludex
enabled auto-merge (squash)
March 26, 2025 08:11
Kludex
disabled auto-merge
March 26, 2025 08:11
Member
|
This PR doesn't fix the typing tho |
Member
Author
I am confused, it very much fixes the issue for me |
Member
|
🤔 
|
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
Fix type error when using strongly typed custom lifespan contexts with FastMCP.