Support AbortSignal from the app layer

[fubhy]

It would be good if it was possible to pass an AbortSignal to anything that may trigger an rpc request (e.g. simulateContract, readContract, estimateContractGas). I recognize how that would require some custom handling for batch / multicall but it should be doable.

AbortSignals are already supported internally at the transport layer but they are not exposed to the app layer. Hence it's currently not possible to cancel requests from the app layer.

[au2001]

I would really like to see this implemented

A use case for this is React Hooks (e.g. wagmi's): each action performed in a useEffect should have a cleanup function
But there is currently no way to cancel requests made by viem AFAIK, so they are subject to memory leaks and race conditions
This Feature Request would be a nice solution and is the recommended one according to the React docs and the linked article

Related issue in ethers.js: ethers-io/ethers.js#4122

[fubhy]

Sounds like this will be implemented via #1701