fix: zero base fee

[holic]

I just bumped viem from 1.6.0 to 1.14.0 and I am seeing "intrinsic gas too high" when using writeContract on an anvil chain running with --base-fee 0 and viem chain set to fees: { defaultPriorityFee: 0n }.

Looking at request logs, I can see a new call to eth_maxPriorityFeePerGas before eth_estimateGas that returns 0x3b9aca00, which is used as the value for maxFeePerGas and maxPriorityFeePerGas in the eth_estimateGas call.

Before the version bump, there was no eth_maxPriorityFeePerGas call and the 0n from the chain config's defaultPriorityFee was used as the value of maxFeePerGas and maxPriorityFeePerGas.

I am not sure if I am misunderstanding the new fee calculation but this seems like a regression from the previous behavior that respected the chain config's defaultPriorityFee? I think this behavior changed in #1058 but haven't read it thoroughly.

I've added a test for this here, but can't seem to get tests running locally to verify that it fails + add a fix.

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PR-Codex overview

Focus of the PR:

This PR focuses on improving the handling of defaultPriorityFee in the code.

Detailed summary:

• Added a check for typeof chain?.fees?.defaultPriorityFee to handle undefined values.
• Added tests for chain override with zero base fee and async zero base fee.
• Updated package.json to include typesVersions for better type definitions.

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[holic]

I think I found it. We had an typeof defaultPriorityFee !== 'undefined' check in https://github.com/wagmi-dev/viem/pull/1006/files#diff-e055abee919d609c1a367c63ac0c8877d34a82f21e687f8901db46bb7eb4a18bR90 but that changed to a falsey check in https://github.com/wagmi-dev/viem/pull/1044/files#diff-cb3ad47420815660f8a1c71a9587607f6ad26342fd4220688031852b1d327c7dR71.

I discovered this because I could change defaultPriorityFee: 0n to defaultPriorityFee: () => 0n and it works again.

I'm still not sure why the prepareTransactionRequest test is failing.