Support TypeChain in deployProxy function

[frimoldi]

As discussed in #325, this change allows deployProxy to returned a typed Contract instance, so the user can use things like Typechain without loosing contract's types definition.

Usage example in a hardhat script 👇🏽

import { ethers, upgrades } from "hardhat";
import { Greeter__factory } from "../typechain";

async function main() {
  const signer = (await ethers.getSigners())[0];
  const factory = new Greeter__factory(signer);
  const greeter = await upgrades.deployProxy<Greeter__factory>(factory, {
    constructorArgs: ["Fran"],
  });

  await greeter.deployed();

  // this is now type safe
  await greeter.greet();
}

[frimoldi]

@frangio please let me know your thoughts on this.

[frangio]

Thank you @frimoldi! This looks solid. I'd love to have a test for this but our tests in this package are written in JavaScript so I don't think we can set one up.

[frangio]

Sorry for the delay. I realized we also have to cover the other functions like upgradeProxy, deployBeaconProxy, etc. Do you want to take a look at those?

[frimoldi]

@frangio sure, I'll take a look as soon as I can.

[frangio]

@frimoldi Let us know if you can carry on with this. 🙂

[frimoldi]

@frangio Yes. Sorry for the delay, I'll find some time this week.

[0xakihiko]

Would love this

[0xWhiteleaf]

Any update on this?

[bulbazavr1024]

@frimoldi Hey! How it's going ?)

[frankbonnet]

What's the status of this?

[ericglau]

Thanks for the initial work and discussions here. This was completed in #1099 and is available in @openzeppelin/hardhat-upgrades@3.8.0