Fix anthropic sdk import

[brichet]

This PR fixes an error when importing ChatAnthropic, due to missing declaration file.

Fixes #7332

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[jacoblee93]

Thank you - CC @bracesproul

[bracesproul]

hey @brichet thank you for doing this! I tested locally with the tsconfig that's inside our examples directory and I wasn't able to reproduce this error. We should still merge your PR since those imports look safer, but could you also send me your tsconfig from the project that this error occurred in? There might be some config we could change in our CI to hopefully catch issues like this in the future.

Thank you!

[jacoblee93]

Thanks @brichet, it's live in @langchain/anthropic@0.3.9

Please see @bracesproul's note above as we'd love to get our CI up to speed on things like this

[brichet]

Thanks for merging it so quickly.
Sorry for the lack of context, this error occurs in this PR, I needed to add a "types" module to avoid it.

The tsconfig in this repo has no exclusion.