Get extended types

[aalmada]

I have a contract that extends ERC721. Some of my methods only need portions of it, for example, IERC721Metadata. How can I "cast" the generated type to this interface?

[krzkaczor]

Do you have ABI and types for the interface?

[aalmada]

TypeChain is generating the type for IERC721Metadata. I'm using ethers-v5 and I think I can somehow get the ABI if needed.

[krzkaczor]

I think you're hitting this bug that was recently introduced: #601

You can downgrade to previous major version of TypeChain and you should be simple assign your contract that extends IERC721Metadata to variable of type IERC721Metadata.

[aalmada]

Hi @krzkaczor!
Given its name, I suspect #648 is related to this and I'm trying to figure out what changed.
How can I use it? Is it included in version 8.0.0?

[aalmada]

It works using the as operator. It wasn't working in my case because of an unrelated issue. 😨

[aalmada]

@krzkaczor I started writing a series of articles about the use of TypeChain with React Query: https://antao-almada.medium.com/using-react-query-to-query-smart-contracts-part-2-8c64647e653b

This made me return to this subject.

I have a MyToken smart contract that derives from ERC721 and Pausable.

If I have a method that takes a parameters of type Pausable, I can pass MyToken without any explicit cast.

If I have a method that takes a parameters of type IERC721Enumerable then I have to explicitly cast using contract as unknown as IERC721Enumerable or contract as ERC721 as IERC721Enumerable.

Is this a known limitation?