Migrate to Hardhat

Author: fvictorio

.gitignore

@@ -1,7 +1,6 @@
 node_modules
 .idea
 
-#Buidler files
+#Hardhat files
 cache
 artifacts
-

README.md

@@ -1,11 +1,11 @@
-# Buidler Hackathon Boilerplate
+# Hardhat Hackathon Boilerplate
 
 This repository contains a sample project that you can use as the starting point
 for your Ethereum project. It's also a great fit for learning the basics of
 smart contract development.
 
 This project is intended to be used with the
-[Buidler Beginners Tutorial](http://buidler.dev/tutorial), but you should be
+[Hardhat Beginners Tutorial](https://hardhat.org/tutorial), but you should be
 able to follow it by yourself by reading the README and exploring its
 `contracts`, `tests`, `scripts` and `frontend` directories.
 
@@ -15,22 +15,22 @@ The first things you need to do are cloning this repository and installing its
 dependencies:
 
 ```sh
-git clone https://github.com/nomiclabs/buidler-hackathon-boilerplate.git
-cd buidler-hackathon-boilerplate
+git clone https://github.com/nomiclabs/hardhat-hackathon-boilerplate.git
+cd hardhat-hackathon-boilerplate
 npm install
 ```
 
-Once installed, let's run Buidler's testing network:
+Once installed, let's run Hardhat's testing network:
 
 ```sh
-npx buidler node
+npx hardhat node
 ```
 
 Then, on a new terminal, go to the repository's root folder and run this to
 deploy your contract:
 
 ```sh
-npx buidler run scripts/deploy.js --network localhost
+npx hardhat run scripts/deploy.js --network localhost
 ```
 
 Finally, we can run the frontend with:
@@ -42,26 +42,26 @@ npm start
 ```
 
 Open [http://localhost:3000/](http://localhost:3000/) to see your Dapp. You will
-need to have [Metamask](http://metamask.io) installed and listening to
+need to have [Metamask](https://metamask.io) installed and listening to
 `localhost 8545`.
 
 ## User Guide
 
-You can find detailed instructions on using this repository and many tips in [its documentation](http://buidler.dev/tutorial).
+You can find detailed instructions on using this repository and many tips in [its documentation](https://hardhat.org/tutorial).
 
-- [Project description (Token.sol)](http://buidler.dev/tutorial/4-contracts/)
-- [Setting up the environment](http://buidler.dev/tutorial/1-setup/)
-- [Testing with Buidler, Mocha and Waffle](http://buidler.dev/tutorial/5-test/)
-- [Setting up Metamask](http://buidler.dev/tutorial/8-frontend/#setting-up-metamask)
-- [Buidler's full documentation](https://buidler.dev/getting-started/)
+- [Project description (Token.sol)](https://hardhat.org/tutorial/4-contracts/)
+- [Setting up the environment](https://hardhat.org/tutorial/1-setup/)
+- [Testing with Hardhat, Mocha and Waffle](https://hardhat.org/tutorial/5-test/)
+- [Setting up Metamask](https://hardhat.org/tutorial/8-frontend/#setting-up-metamask)
+- [Hardhat's full documentation](https://hardhat.org/getting-started/)
 
-For a complete introduction to Buidler, refer to [this guide](https://buidler.dev/getting-started/#overview).
+For a complete introduction to Hardhat, refer to [this guide](https://hardhat.org/getting-started/#overview).
 
 ## What’s Included?
 
-Your environment will have everything you need to build a Dapp powered by Buidler and React.
+Your environment will have everything you need to build a Dapp powered by Hardhat and React.
 
-- [Buidler](https://buidler.dev/): An Ethereum development task runner and testing network.
+- [Hardhat](https://hardhat.org/): An Ethereum development task runner and testing network.
 - [Mocha](https://mochajs.org/): A JavaScript test runner.
 - [Chai](https://www.chaijs.com/): A JavaScript assertion library.
 - [ethers.js](https://docs.ethers.io/ethers.js/html/): A JavaScript library for interacting with Ethereum.
@@ -70,16 +70,16 @@ Your environment will have everything you need to build a Dapp powered by Buidle
 
 ## Troubleshooting
 
-- `Invalid nonce` errors: if you are seeing this error on the `buidler node`
+- `Invalid nonce` errors: if you are seeing this error on the `npx hardhat node`
   console, try resetting your Metamask account. This will reset the account's
   transaction history and also the nonce. Open Metamask, click on your account
   followed by `Settings > Advanced > Reset Account`.
 
 ## Feedback, help and news
 
 We'd love to have your feedback on this tutorial. Feel free to reach us through
-this repository or [our Telegram Support Group](https://t.me/BuidlerSupport).
+this repository or [our Discord server](https://invite.gg/HardhatSupport).
 
-Also you can [follow Nomic Labs on Twitter](https://twitter.com/nomiclabs).
+Also you can [follow us on Twitter](https://twitter.com/HardhatHQ).
 
 **Happy _buidling_!**

buidler.config.js

@@ -1,16 +1,18 @@
+//SPDX-License-Identifier: UNLICENSED
+
 // Solidity files have to start with this pragma.
 // It will be used by the Solidity compiler to validate its version.
-pragma solidity ^0.5.15;
+pragma solidity ^0.7.0;
 
 // We import this library to be able to use console.log
-import "@nomiclabs/buidler/console.sol";
+import "hardhat/console.sol";
 
 
 // This is the main building block for smart contracts.
 contract Token {
     // Some string type variables to identify the token.
-    string public name = "My Buidler Token";
-    string public symbol = "MBT";
+    string public name = "My Hardhat Token";
+    string public symbol = "MHT";
 
     // The fixed amount of tokens stored in an unsigned integer type variable.
     uint256 public totalSupply = 1000000;
@@ -27,7 +29,7 @@ contract Token {
      * The `constructor` is executed only once when the contract is created.
      * The `public` modifier makes a function callable from outside the contract.
      */
-    constructor() public {
+    constructor() {
         // The totalSupply is assigned to transaction sender, which is the account
         // that is deploying the contract.
         balances[msg.sender] = totalSupply;

contracts/Token.sol

@@ -32,8 +32,8 @@ this project, and what can be reused.
 ## Feedback, help and news
 
 Feel free to reach us through this repository or
-[our Telegram Support Group](https://t.me/BuidlerSupport).
+[our Discord server](https://invite.gg/HardhatSupport).
 
-Also you can [follow Nomic Labs on Twitter](https://twitter.com/nomiclabs).
+Also you can [follow us on Twitter](https://twitter.com/HardhatHQ).
 
 **Happy _buidling_!**

frontend/README.md

@@ -7,7 +7,7 @@
     <meta name="theme-color" content="#000000" />
     <meta
       name="description"
-      content="Buidler React Dapp"
+      content="Hardhat React Dapp"
     />
     <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
     <!--
@@ -24,7 +24,7 @@
       work correctly both with client-side routing and a non-root public URL.
       Learn how to configure a non-root public URL by running `npm run build`.
     -->
-    <title>Buidler + React App = Dapp</title>
+    <title>Hardhat + React App = Dapp</title>
   </head>
   <body>
     <noscript>You need to enable JavaScript to run this app.</noscript>

frontend/public/index.html

@@ -1,6 +1,6 @@
 {
-  "short_name": "Buidler React Dapp",
-  "name": "Buidler Create React Dapp Sample",
+  "short_name": "Hardhat React Dapp",
+  "name": "Hardhat Create React Dapp Sample",
   "icons": [
     {
       "src": "favicon.ico",

frontend/public/manifest.json

@@ -19,10 +19,10 @@ import { TransactionErrorMessage } from "./TransactionErrorMessage";
 import { WaitingForTransactionMessage } from "./WaitingForTransactionMessage";
 import { NoTokensMessage } from "./NoTokensMessage";
 
-// This is the Buidler EVM network id, you might change it in the buidler.config.js
+// This is the Hardhat Network id, you might change it in the hardhat.config.js
 // Here's a list of network ids https://docs.metamask.io/guide/ethereum-provider.html#properties
 // to use when deploying to other networks.
-const BUIDLER_EVM_NETWORK_ID = '31337';
+const HARDHAT_NETWORK_ID = '31337';
 
 // This is an error code that indicates that the user canceled a transaction
 const ERROR_CODE_TX_REJECTED_BY_USER = 4001;
@@ -278,7 +278,7 @@ export class Dapp extends React.Component {
     //   - It can fail before reaching the ethereum network (i.e. if the user
     //     doesn't have ETH for paying for the tx's gas)
     //   - It has to be mined, so it isn't immediately confirmed.
-    //     Note that some testing networks, like Buidler EVM, do mine
+    //     Note that some testing networks, like Hardhat Network, do mine
     //     transactions immediately, but your dapp should be prepared for
     //     other networks.
     //   - It can fail once mined.
@@ -356,7 +356,7 @@ export class Dapp extends React.Component {
 
   // This method checks if Metamask selected network is Localhost:8545 
   _checkNetwork() {
-    if (window.ethereum.networkVersion === BUIDLER_EVM_NETWORK_ID) {
+    if (window.ethereum.networkVersion === HARDHAT_NETWORK_ID) {
       return true;
     }
 

frontend/src/components/Dapp.js

@@ -8,7 +8,7 @@ export function NoTokensMessage({ selectedAddress }) {
         To get some tokens, open a terminal in the root of the repository and run: 
         <br />
         <br />
-        <code>npx buidler --network localhost faucet {selectedAddress}</code>
+        <code>npx hardhat --network localhost faucet {selectedAddress}</code>
       </p>
     </>
   );

frontend/src/components/NoTokensMessage.js

@@ -0,0 +1,10 @@
+require("@nomiclabs/hardhat-waffle");
+
+// The next line is part of the sample project, you don't need it in your
+// project. It imports a Hardhat task definition, that can be used for
+// testing the frontend.
+require("./tasks/faucet");
+
+module.exports = {
+  solidity: "0.7.3"
+};