Chainlink Local is an installable dependency. It provides a tool (the Chainlink Local Simulator) that developers import into their Foundry and Hardhat scripts. This tool runs Chainlink CCIP locally which means developers can rapidly explore, prototype and iterate CCIP dApps off-chain, and move to testnet only when they're ready to test in a live environment.
The package exposes a set of smart contracts and scripts with which you build, deploy and execute CCIP token transfers and arbitrary messages on a local Hardhat or Anvil (Foundry) development node. Chainlink Local also supports forked nodes.
User Contracts tested with Chainlink Local can be deployed to test networks without any modifications.
Install the package by running:
forge install smartcontractkit/chainlink-local
and then set remappings to: @chainlink/local/=lib/chainlink-local/ in either remappings.txt or foundry.toml file
npm install git+https://github.com/smartcontractkit/chainlink-local.git
import "https://github.com/smartcontractkit/chainlink-local/blob/main/src/ccip/CCIPLocalSimulator.sol";Import CCIPLocalSimulator.sol inside your tests or scripts, for example:
// test/demo.t.sol
pragma solidity ^0.8.19;
import {Test, console2} from "forge-std/Test.sol";
import {IRouterClient, WETH9, LinkToken, BurnMintERC677Helper} from "@chainlink/local/src/ccip/CCIPLocalSimulator.sol";
import {CCIPLocalSimulator} from "@chainlink/local/src/ccip/CCIPLocalSimulator.sol";
contract Demo is Test {
CCIPLocalSimulator public ccipLocalSimulator;
function setUp() public {
ccipLocalSimulator = new CCIPLocalSimulator();
(
uint64 chainSelector,
IRouterClient sourceRouter,
IRouterClient destinationRouter,
WETH9 wrappedNative,
LinkToken linkToken,
BurnMintERC677Helper ccipBnM,
BurnMintERC677Helper ccipLnM
) = ccipLocalSimulator.configuration();
ccipLocalSimulator.requestLinkFromFaucet(receiver, amount);
}
}To view detailed documentation and more examples, visit the Chainlink Local Documentation.
Note
This tutorial represents an educational example to use a Chainlink system, product, or service and is provided to demonstrate how to interact with Chainlink’s systems, products, and services to integrate them into your own. This template is provided “AS IS” and “AS AVAILABLE” without warranties of any kind, it has not been audited, and it may be missing key checks or error handling to make the usage of the system, product or service more clear. Do not use the code in this example in a production environment without completing your own audits and application of best practices. Neither Chainlink Labs, the Chainlink Foundation, nor Chainlink node operators are responsible for unintended outputs that are generated due to errors in code.