solidity-hardhat-development

Run npx hardhat --init to start. Hardhat 3 requires ESM, so set "type": "module" in your package.json. You need Node.js v22.10 or newer. Use defineConfig from hardhat/config for your configuration file.

The defineConfig pattern organizes your setup with solidity, networks, and plugins keys. Networks use type: "edr-simulated" for local testing or type: "http" for remote connections. Specify chainType as "l1", "op", or "generic". Use configVariable("KEY") for secrets to keep them out of your code. Build profiles allow different settings for production, like enabling the optimizer. Plugins must be explicitly listed...

Solidity tests use a Rust-powered runner and .t.sol files. These tests inherit from forge-std/Test.sol and support full vm cheatcodes like vm.prank and vm.deal. Fuzz testing works out of the box. TypeScript tests can use the Node.js test runner with Viem or Mocha with Ethers.js. Access network helpers through the networkHelpers property. Run npx hardhat test for all tests or npx hardhat test solidity for just Soli...