Clarification on reusing deployments

[0xCardinalError]

I would like to know more about reusing deployments. Precisely I wonder when deployments are reused and when is the situation that hh deploy reuses them. Is the only parameter solidity code change and while the code is exactly the same they will be always reused if file save is there or is there some other parameter that could also make hh deploy make new contract?

[wighawag]

tx data is what is looked at, so if bytecode changes (including ipfs hash appended at the end, and libraries) OR constructor arguments changes, then contract will be deployed

You can also specify skipIfAlreadyDeployed: true to not redeploy

[0xCardinalError]

skipIfAlreadyDeployed is the flag for all contracts, probably I would need it per contract,
but I guess I could delete some data from the deployments dir for the ones I want to deploy and the rest would be skipped.

[0xCardinalError]

But best way would be to know what changed and keep it the same, thnx for info.

[0xCardinalError]

I have a strange situation where the bytecode is different between two compiled contracts
although

• I have the same code when c/p one code over the other (no git diff)
• I have the same constructors on both deployments
• I have same locked solidity version in hardhat config 0.8.19

Yet when I go and deploy contracts, it's not reused as hh is deploying different bytecode now, then it was some 5 months ago.

I could guess if it is possible that somehow solidity compiler is compiling contracts differently now then then, even on the same version. If not that don't really know what else...