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[PR #6210] fix(langgraph): handle multiple annotations w/ BaseChannel detection #4906

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opened 2026-02-20 17:50:56 -05:00 by yindo · 0 comments
yindo commented 2026-02-20 17:50:56 -05:00
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Original Pull Request: https://github.com/langchain-ai/langgraph/pull/6210

State: closed
Merged: Yes

This PR ensures that even if a type has multiple annotations, we can still detect the BaseChannel subclasses attached.

class State(TypedDict):
    # recognized as EphemeralValue(int)
    foo: Annotated[int, EphemeralValue]

    # now recognized as EphemeralValue(int)
    bar: Annotated[int, EphemeralValue, OtherMetadata]

    # now recognized as EphemeralValue(int)
    baz: Annotated[int, SomeMetadata, EphemeralValue, OtherMetadata]
**Original Pull Request:** https://github.com/langchain-ai/langgraph/pull/6210 **State:** closed **Merged:** Yes --- This PR ensures that even if a type has multiple annotations, we can still detect the `BaseChannel` subclasses attached. ```py class State(TypedDict): # recognized as EphemeralValue(int) foo: Annotated[int, EphemeralValue] # now recognized as EphemeralValue(int) bar: Annotated[int, EphemeralValue, OtherMetadata] # now recognized as EphemeralValue(int) baz: Annotated[int, SomeMetadata, EphemeralValue, OtherMetadata] ```
yindo added the pull-request label 2026-02-20 17:50:56 -05:00
yindo closed this issue 2026-02-20 17:50:56 -05:00
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Reference: langchain-ai/langgraph#4906
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