Facet Sol

Use the facet-sol library:

GitHub - 0xFacet/facet-solGitHub

Install with forge install 0xFacet/facet-sol.

To send Facet transactions from a smart contract, first import LibFacet:

import { LibFacet } from "lib/facet-sol/src/utils/LibFacet.sol";

Now you can send transactions like this:

LibFacet.sendFacetTransaction({
    value: 0,
    maxFeePerGas: 1000 gwei,
    gasLimit: 500_000,
    data: type(SimpleStorage).creationCode
});

However you can't use LibFacet directly to send transactions from within a Foundry script. This is because Foundry scripts are run as EOAs and EOAs send Facet transactions using L1 transactions, not events.

facet-sol has a separate library for creating Facet transactions from within foundry scripts, FacetScript. Here's an example:

// script/Deploy.s.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { FacetScript } from "lib/facet-sol/src/foundry-utils/FacetScript.sol";
import { Example } from "lib/facet-sol/src/Example.sol";
import {Script, console} from "forge-std/Script.sol";

contract DeployExample is FacetScript {
    function setUp() public override {
        super.setUp();
    }

    function run() public broadcast {
        address deployAddress = nextL2Address();
        console.log("Contract will be deployed at:", deployAddress);
        
        sendFacetTransactionFoundry({
            gasLimit: 5_000_000,
            data: abi.encodePacked(
                type(Example).creationCode,
                abi.encode(123, "hello!")
            )
        });
        
        bytes memory setNumberCalldata = abi.encodeWithSelector(
            Example.setNumber.selector,
            123
        );
        
        sendFacetTransactionFoundry({
            to: deployAddress,
            gasLimit: 5_000_000,
            data: setNumberCalldata
        });
    }
}

To run this you would use a command like:

L2_RPC="https://sepolia.facet.org" forge script 'script/DeployExample.s.sol' --rpc-url "https://...l1 rpc..." --private-key 0x1234 --broadcast