Add Advanced Sample Project that uses TypeScript

packages/e2e/test/fixture-projects/advanced-ts-sample-project/package.json.template

@@ -0,0 +1,6 @@
+{
+  "name": "advanced-typescript-project",
+  "version": "1.0.0",
+  "license": "MIT",
+  "dependencies": {}
+}

packages/e2e/test/index.ts

@@ -114,5 +114,39 @@ describe("e2e tests", function () {
         });
       }
     });
+
+    describe("advanced TypeScript sample project", function () {
+      useFixture("advanced-ts-sample-project");
+
+      before(function () {
+        shell.exec(`${hardhatBinary}`, {
+          env: {
+            ...process.env,
+            HARDHAT_CREATE_ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_WITH_DEFAULTS:
+              "true",
+          },
+        });
+      });
+
+      for (const suggestedCommand of [
+        // This list should be kept reasonably in sync with
+        // hardhat-core/sample-projects/advanced-ts/README.txt
+        `${hardhatBinary} compile`,
+        `${hardhatBinary} test`,
+        `${hardhatBinary} run scripts/deploy.ts`,
+        "TS_NODE_FILES=true ts-node scripts/deploy.ts",
+        "REPORT_GAS=true npx hardhat test",
+        `${hardhatBinary} coverage`,
+        "npx eslint '**/*.{ts,js}'",
+        "npx eslint '**/*.{ts,js}' --fix",
+        "npx prettier '**/*.{json,sol,md}' --check",
+        "npx solhint 'contracts/**/*.sol'",
+        "npx solhint 'contracts/**/*.sol' --fix",
+      ]) {
+        it(`should permit successful execution of the suggested command "${suggestedCommand}"`, async function () {
+          shell.exec(suggestedCommand);
+        });
+      }
+    });
   });
 });

packages/hardhat-core/recommended-gitignore.txt

@@ -1,5 +1,8 @@
 node_modules
 .env
+coverage
+coverage.json
+typechain
 
 #Hardhat files
 cache

packages/hardhat-core/sample-projects/advanced-ts/.eslintrc.js

@@ -0,0 +1,41 @@
+module.exports = {
+  env: {
+    browser: false,
+    es2021: true,
+    mocha: true,
+    node: true,
+  },
+  plugins: ["@typescript-eslint"],
+  extends: [
+    "standard",
+    "plugin:prettier/recommended",
+    "plugin:node/recommended",
+  ],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    ecmaVersion: 12,
+  },
+  overrides: [
+    {
+      files: ["scripts/**"],
+      rules: { "no-process-exit": "off" },
+    },
+    {
+      files: ["hardhat.config.ts"],
+      globals: { hre: true },
+    },
+    {
+      files: ["hardhat.config.ts", "scripts/**", "test/**"],
+      rules: {
+        "node/no-unpublished-import": "off",
+        "node/no-unpublished-require": "off",
+      },
+    },
+  ],
+  rules: {
+    "node/no-unsupported-features/es-syntax": [
+      "error",
+      { ignores: ["modules"] },
+    ],
+  },
+};

packages/hardhat-core/sample-projects/advanced-ts/README.md

@@ -0,0 +1,46 @@
+# Advanced Sample Hardhat Project
+
+This project demonstrates an advanced Hardhat use case, integrating other tools commonly used alongside Hardhat in the ecosystem.
+
+The project comes with a sample contract, a test for that contract, a sample script that deploys that contract, and an example of a task implementation, which simply lists the available accounts. It also comes with a variety of other tools, preconfigured to work with the project code.
+
+Try running some of the following tasks:
+
+```shell
+npx hardhat accounts
+npx hardhat compile
+npx hardhat clean
+npx hardhat test
+npx hardhat node
+npx hardhat help
+REPORT_GAS=true npx hardhat test
+npx hardhat coverage
+npx hardhat run scripts/deploy.js
+TS_NODE_FILES=true npx ts-node scripts/deploy.js
+npx eslint '**/*.{js,ts}'
+npx eslint '**/*.{js,ts}' --fix
+npx prettier '**/*.{json,sol,md}' --check
+npx prettier '**/*.{json,sol,md}' --write
+npx solhint 'contracts/**/*.sol'
+npx solhint 'contracts/**/*.sol' --fix
+```
+
+# Etherscan verification
+
+To try out Etherscan verification, you first need to deploy a contract to an Ethereum network that's supported by Etherscan, such as Ropsten.
+
+In this project, copy the .env.template file to a file named .env, and then edit it to fill in the details. Enter your Etherscan API key, your Ropsten node URL (eg from Alchemy), and the private key of the account which will send the deployment transaction. With a valid .env file in place, first deploy your contract:
+
+```shell
+hardhat run --network ropsten scripts/sample-script.js
+```
+
+Then, copy the deployment address and paste it in to replace `DEPLOYED_CONTRACT_ADDRESS` in this command:
+
+```shell
+npx hardhat verify --network ropsten DEPLOYED_CONTRACT_ADDRESS "Hello, Hardhat!"
+```
+
+# Performance optimizations
+
+For faster runs of your tests and scripts, consider skipping ts-node's type checking by setting the environment variable `TS_NODE_TRANSPILE_ONLY` to `1` in hardhat's environment. For more details see [the documentation](https://hardhat.org/guides/typescript.html#performance-optimizations).

packages/hardhat-core/sample-projects/advanced-ts/hardhat.config.ts

@@ -0,0 +1,45 @@
+import * as dotenv from "dotenv";
+
+import { HardhatUserConfig, task } from "hardhat/config";
+import "@nomiclabs/hardhat-etherscan";
+import "@nomiclabs/hardhat-waffle";
+import "@typechain/hardhat";
+import "hardhat-gas-reporter";
+import "solidity-coverage";
+
+dotenv.config();
+
+// This is a sample Hardhat task. To learn how to create your own go to
+// https://hardhat.org/guides/create-task.html
+task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
+  const accounts = await hre.ethers.getSigners();
+
+  for (const account of accounts) {
+    console.log(account.address);
+  }
+});
+
+// You need to export an object to set up your config
+// Go to https://hardhat.org/config/ to learn more
+
+const config: HardhatUserConfig = {
+  solidity: "0.8.4",
+  networks: {
+    hardhat: {
+      initialBaseFeePerGas: 0, // workaround from https://github.com/sc-forks/solidity-coverage/issues/652#issuecomment-896330136 . Remove when that issue is closed.
+    },
+    ropsten: {
+      url: process.env.ROPSTEN_URL || "",
+      accounts: [process.env.PRIVATE_KEY || `0x${"0".repeat(40)}`],
+    },
+  },
+  gasReporter: {
+    enabled: process.env.REPORT_GAS !== undefined,
+    currency: "USD",
+  },
+  etherscan: {
+    apiKey: process.env.ETHERSCAN_API_KEY,
+  },
+};
+
+export default config;

packages/hardhat-core/sample-projects/advanced-ts/scripts/deploy.ts

@@ -0,0 +1,32 @@
+// We require the Hardhat Runtime Environment explicitly here. This is optional
+// but useful for running the script in a standalone fashion through `node <script>`.
+//
+// When running the script with `npx hardhat run <script>` you'll find the Hardhat
+// Runtime Environment's members available in the global scope.
+import { ethers } from "hardhat";
+
+async function main() {
+  // Hardhat always runs the compile task when running scripts with its command
+  // line interface.
+  //
+  // If this script is run directly using `node` you may want to call compile
+  // manually to make sure everything is compiled
+  // await hre.run('compile');
+
+  // We get the contract to deploy
+  const Greeter = await ethers.getContractFactory("Greeter");
+  const greeter = await Greeter.deploy("Hello, Hardhat!");
+
+  await greeter.deployed();
+
+  console.log("Greeter deployed to:", greeter.address);
+}
+
+// We recommend this pattern to be able to use async/await everywhere
+// and properly handle errors.
+main()
+  .then(() => process.exit(0))
+  .catch((error) => {
+    console.error(error);
+    process.exit(1);
+  });

packages/hardhat-core/sample-projects/advanced-ts/test/index.ts

@@ -0,0 +1,19 @@
+import { expect } from "chai";
+import { ethers } from "hardhat";
+
+describe("Greeter", function () {
+  it("Should return the new greeting once it's changed", async function () {
+    const Greeter = await ethers.getContractFactory("Greeter");
+    const greeter = await Greeter.deploy("Hello, world!");
+    await greeter.deployed();
+
+    expect(await greeter.greet()).to.equal("Hello, world!");
+
+    const setGreetingTx = await greeter.setGreeting("Hola, mundo!");
+
+    // wait until the transaction is mined
+    await setGreetingTx.wait();
+
+    expect(await greeter.greet()).to.equal("Hola, mundo!");
+  });
+});

packages/hardhat-core/sample-projects/advanced-ts/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "es2018",
+    "module": "commonjs",
+    "strict": true,
+    "esModuleInterop": true,
+    "outDir": "dist",
+    "declaration": true
+  },
+  "include": ["./scripts", "./test", "./typechain"],
+  "files": ["./hardhat.config.ts"]
+}

packages/hardhat-core/src/internal/cli/cli.ts

@@ -98,6 +98,9 @@ async function main() {
         process.env.HARDHAT_CREATE_BASIC_SAMPLE_PROJECT_WITH_DEFAULTS !==
           undefined ||
         process.env.HARDHAT_CREATE_ADVANCED_SAMPLE_PROJECT_WITH_DEFAULTS !==
+          undefined ||
+        process.env
+          .HARDHAT_CREATE_ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_WITH_DEFAULTS !==
           undefined)
     ) {
       await createProject();

packages/hardhat-core/src/internal/cli/project-creation.ts

@@ -20,13 +20,15 @@ import { emoji } from "./emoji";
 enum Action {
   CREATE_BASIC_SAMPLE_PROJECT_ACTION = "Create a basic sample project",
   CREATE_ADVANCED_SAMPLE_PROJECT_ACTION = "Create an advanced sample project",
+  CREATE_ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_ACTION = "Create an advanced sample project that uses TypeScript",
   CREATE_EMPTY_HARDHAT_CONFIG_ACTION = "Create an empty hardhat.config.js",
   QUIT_ACTION = "Quit",
 }
 
 type SampleProjectTypeCreationAction =
   | Action.CREATE_BASIC_SAMPLE_PROJECT_ACTION
-  | Action.CREATE_ADVANCED_SAMPLE_PROJECT_ACTION;
+  | Action.CREATE_ADVANCED_SAMPLE_PROJECT_ACTION
+  | Action.CREATE_ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_ACTION;
 
 interface Dependencies {
   [name: string]: string;
@@ -60,11 +62,26 @@ const ADVANCED_SAMPLE_PROJECT_DEPENDENCIES: Dependencies = {
   "solidity-coverage": "^0.7.16",
 };
 
+const ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_DEPENDENCIES: Dependencies = {
+  ...ADVANCED_SAMPLE_PROJECT_DEPENDENCIES,
+  "@typechain/ethers-v5": "^7.0.1",
+  "@typechain/hardhat": "^2.3.0",
+  "@typescript-eslint/eslint-plugin": "^4.29.1",
+  "@typescript-eslint/parser": "^4.29.1",
+  "@types/chai": "^4.2.21",
+  "@types/node": "^16.4.13",
+  "@types/mocha": "^9.0.0",
+  "ts-node": "^10.1.0",
+  typechain: "^5.1.2", // a workaround. see https://github.com/nomiclabs/hardhat/issues/1672#issuecomment-894497156
+  typescript: "^4.3.5",
+};
+
 const SAMPLE_PROJECT_DEPENDENCIES: {
   [K in SampleProjectTypeCreationAction]: Dependencies;
 } = {
   [Action.CREATE_BASIC_SAMPLE_PROJECT_ACTION]: BASIC_SAMPLE_PROJECT_DEPENDENCIES,
   [Action.CREATE_ADVANCED_SAMPLE_PROJECT_ACTION]: ADVANCED_SAMPLE_PROJECT_DEPENDENCIES,
+  [Action.CREATE_ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_ACTION]: ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_DEPENDENCIES,
 };
 
 const TELEMETRY_CONSENT_TIMEOUT = 10000;
@@ -128,23 +145,42 @@ async function copySampleProject(
 ) {
   const packageRoot = getPackageRoot();
 
-  // first copy the basic project, then, if the advanced project is what was
-  // requested, overlay the advanced files on top of the basic ones.
+  // first copy the basic project, then, if an advanced project is what was
+  // requested, overlay the advanced files on top of the basic ones. then, if
+  // the advanced TypeScript project is what was requested, overlay those files
+  // on top of the advanced ones.
 
   await fsExtra.ensureDir(projectRoot);
   await fsExtra.copy(
     path.join(packageRoot, "sample-projects", "basic"),
     projectRoot
   );
 
-  if (projectType === Action.CREATE_ADVANCED_SAMPLE_PROJECT_ACTION) {
+  if (
+    projectType === Action.CREATE_ADVANCED_SAMPLE_PROJECT_ACTION ||
+    projectType === Action.CREATE_ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_ACTION
+  ) {
     await fsExtra.copy(
       path.join(packageRoot, "sample-projects", "advanced"),
       projectRoot
     );
     await fsExtra.remove(path.join(projectRoot, "scripts", "sample-script.js"));
   }
 
+  if (projectType === Action.CREATE_ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_ACTION) {
+    await fsExtra.copy(
+      path.join(packageRoot, "sample-projects", "advanced-ts"),
+      projectRoot
+    );
+    for (const jsFile of [
+      "hardhat.config.js",
+      path.join("scripts", "deploy.js"),
+      path.join("test", "sample-test.js"),
+    ]) {
+      await fsExtra.remove(jsFile);
+    }
+  }
+
   // This is just in case we have been using the sample project for dev/testing
   await removeTempFilesIfPresent(projectRoot);
 
@@ -203,7 +239,14 @@ async function getAction(): Promise<Action> {
     undefined
   ) {
     return Action.CREATE_ADVANCED_SAMPLE_PROJECT_ACTION;
+  } else if (
+    process.env
+      .HARDHAT_CREATE_ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_WITH_DEFAULTS !==
+    undefined
+  ) {
+    return Action.CREATE_ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_ACTION;
   }
+
   const { default: enquirer } = await import("enquirer");
   try {
     const actionResponse = await enquirer.prompt<{ action: string }>([
@@ -291,6 +334,9 @@ export async function createProject() {
     process.env.HARDHAT_CREATE_BASIC_SAMPLE_PROJECT_WITH_DEFAULTS !==
       undefined ||
     process.env.HARDHAT_CREATE_ADVANCED_SAMPLE_PROJECT_WITH_DEFAULTS !==
+      undefined ||
+    process.env
+      .HARDHAT_CREATE_ADVANCED_TYPESCRIPT_SAMPLE_PROJECT_WITH_DEFAULTS !==
       undefined;
 
   if (useDefaultPromptResponses) {