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Hardhat 3 has a concept of configuration variables that are stored in an encrypted keystore file: https://hardhat.org/docs/learn-more/configuration-variables#how-to-use-configuration-variables-and-the-keystore-plugin
What were the headaches?
A new linting library for Solidity: https://github.com/fvictorio/slippy
You should be able to write smart contracts in Solidity and deploy them to Base using Hardhat (either within a script or using the Hardhat Ignition deployment tool). Hardhat 3 has built in support for simulating Optimism chains like Base: https://hardhat.org/docs/learn-more/whats-new#multichain-support