@unipeer/hardhat-typechain v0.3.2
hardhat-typechain
Better integration with hardhat builtin tasks!
Add Typechain tasks to your hardhat project!
What
TypeChain gives you Typescript bindings for your smart contracts. Now, your tests and frontend code can be typesafe and magically autocomplete smart contract function names!
Installation
npm i @unipeer/hardhat-typechain typechain ts-generator
And add the following statement to your hardhat.config.js
:
require("@unipeer/hardhat-typechain");
or for typescript:
import "@unipeer/hardhat-typechain";
Tasks
This plugin adds the typechain task to hardhat:
Generate Typechain typings for compiled contracts
Configuration
This plugin extends the hardhatConfig
optional typechain
object. The object contains two fields, outDir
and target
. outDir
is the output directory of the artifacts that TypeChain creates (defaults to typechain
). target
is one of the targets specified by the TypeChain docs (defaults to ethers
).
You can also configure this plugin to automatically run after every compile
command
by setting the runOnCompile
field to true. runOnCompile
is true by default
and is recommended to avoid any frustrations in case where you forget to re-generate types
after updating a contract and your tests are out of sync with your contract code.
These are the default configs that you can change:
module.exports = {
typechain: {
outDir: "types",
target: "ethers-v5",
runOnCompile: true
},
};
Usage
npx hardhat typechain
- Compiles and generates Typescript typings for your contracts.
Example Waffle + Ethers test that uses typedefs for contracts:
import { ethers } from "hardhat";
import chai from "chai";
import { Wallet } from "ethers";
import { deployContract, solidity } from "ethereum-waffle";
import CounterArtifact from "../artifacts/Counter.json";
import { Counter } from "../types/Counter";
chai.use(solidity);
const { expect } = chai;
describe("Counter", () => {
let counter: Counter;
beforeEach(async () => {
// 1
const signers = await ethers.signers();
// 2
counter = (await deployContract(
<Wallet>signers[0],
CounterArtifact
)) as Counter;
const initialCount = await counter.getCount();
// 3
expect(initialCount).to.eq(0);
expect(counter.address).to.properAddress;
});
// 4
describe("count up", async () => {
it("should count up", async () => {
await counter.countUp();
let count = await counter.getCount();
expect(count).to.eq(1);
});
});
describe("count down", async () => {
// 5
it("should fail", async () => {
await counter.countDown();
});
it("should count down", async () => {
await counter.countUp();
await counter.countDown();
const count = await counter.getCount();
expect(count).to.eq(0);
});
});
});
See this starter kit for a full example!