• In the IPGPHelper interface, the sign method should return a string instead of Promise<string> because it's not an asynchronous function.

• A small typo in the method verifySignature of the PGPHelper object. The property verificationResult.signatures[0].verified should be extracted as const { verified } = verificationResult.signatures[0].

• In the exported functions (generateKeyPair, pgpEncrypt, sign, verifySignature, pgpDecrypt), the method arguments should have consistent spacing. For example, instead of {cipherText,toPrivateKeyArmored}: {cipherText: any..., it should be { cipherText, toPrivateKeyArmored }: { cipherText: any....

• In the verifySignature function, the comment // setting date to 1 day in the future to avoid issues with clock skew seems to be misleading as it's not doing the mentioned operation. Consider removing it since there's no date setting happening in the code.

All the mentioned issues have been addressed. Overall, the code logic seems correct and there are no major issues.

Code Review Result: All looks good.