Solidity – Is There a Way to Handle abi.decode Errors with Hardhat?

custom-errorshardhatrequirerevertsolidity

I am trying to decode a bytes value, and while writing tests, I was trying to pass invalid values to force an error.
Although I get the error missing revert data in call exception, I cannot find a way to revert with a custom error/string.

Best Answer

While writing the question, I was able to find a solution. ATTOW this is already a feature request. See issue-10381 and issue-10933 on github. Thankfully one of the core members mentioned in this comment that this feature is on the roadmap.

If you're reading this in the future, please leave an updated answer.

Related Solutions

Solidity Ethers.js – Adding All Revert Error Strings to Ethers.js Interface

I managed to get it working by first checking if it's a standard revert string and if not attempting to parse it as a custom solidity error.

In addition to Error(string) Solidity has another built-in error i.e. Panic(uint), hence I've added a decoding for that as well.

export const parseError = (errorData) => {

    if (errorData.startsWith('0x08c379a0')) { // decode Error(string)

        const content = `0x${errorData.substring(10)}`;
        const reason = utils.defaultAbiCoder.decode(["string"], content);

        return reason[0]; // reason: string; for standard revert error string
    }

    if (errorData.startsWith('0x4e487b71')) { // decode Panic(uint)
        const content = `0x${errorData.substring(10)}`;
        const code = utils.defaultAbiCoder.decode(["uint"], content);

        return code[0];
    }

    try {
        const errDescription = iErrors.parseError(errorData);
        return errDescription;
    } catch (e) {
        console.error(e);
    }
}

Best Answer

Related Solutions

Solidity Ethers.js – Adding All Revert Error Strings to Ethers.js Interface

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