首先我们来测试一下

Typescript

yarn add -D ts-node typescript 

测试之前

hardhat.config.js -> hardhat.config.ts

写测试

import "@nomiclabs/hardhat-ethers";

import { ethers } from "hardhat";
import { expect } from "chai";

describe("Hello World", () => {
    it("should get the hello world", async () => {
        const HW = await ethers.getContractFactory("HelloWorld");
        const hello = await HW.deploy();

        expect(await hello.hello()).to.equal("Hello, World!");
    });
});

安装测试类型依赖

yarn add -D @types/mocha

Error

An unexpected error occurred:

error TS5109: Option 'moduleResolution' must be set to 'NodeNext' (or left unspecified) when option 'module' is set to 'NodeNext'.