init project

.gitignore

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+node_modules
+.env
+coverage
+coverage.json
+typechain
+
+#Hardhat files
+cache
+artifacts

README.md

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+# My NFT Collection
+
+Demo NFT collection for learning purposes.
+
+## Built With
+
+- [Solidity](https://soliditylang.org/)
+- [Hardhat](https://hardhat.org/)

contracts/Greeter.sol

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+//SPDX-License-Identifier: Unlicense
+pragma solidity ^0.8.0;
+
+import "hardhat/console.sol";
+
+contract Greeter {
+    string private greeting;
+
+    constructor(string memory _greeting) {
+        console.log("Deploying a Greeter with greeting:", _greeting);
+        greeting = _greeting;
+    }
+
+    function greet() public view returns (string memory) {
+        return greeting;
+    }
+
+    function setGreeting(string memory _greeting) public {
+        console.log("Changing greeting from '%s' to '%s'", greeting, _greeting);
+        greeting = _greeting;
+    }
+}

hardhat.config.js

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+require("@nomiclabs/hardhat-waffle");
+
+// 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
+
+/**
+ * @type import('hardhat/config').HardhatUserConfig
+ */
+module.exports = {
+  solidity: "0.8.4",
+};

package.json

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+{
+  "name": "nft-collection",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "scripts": {
+    "dev": "npx hardhat run scripts/sample-script.js"
+  },
+  "devDependencies": {
+    "@nomiclabs/hardhat-ethers": "^2.0.0",
+    "@nomiclabs/hardhat-waffle": "^2.0.0",
+    "chai": "^4.2.0",
+    "ethereum-waffle": "^3.0.0",
+    "ethers": "^5.0.0",
+    "hardhat": "^2.9.3"
+  },
+  "dependencies": {
+    "@openzeppelin/contracts": "^4.5.0"
+  }
+}

scripts/sample-script.js

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+// 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.
+const hre = require("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 hre.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);
+  });

test/sample-test.js

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+const { expect } = require("chai");
+const { ethers } = require("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!");
+  });
+});

yarn-error.log

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+Arguments: 
+  /Users/rnemausat/.nvm/versions/node/v16.13.2/bin/node /usr/local/Cellar/yarn/1.22.18/libexec/bin/yarn.js init
+
+PATH: 
+  /Users/rnemausat/.pyenv/shims:/Users/rnemausat/.pyenv/bin:/usr/local/sbin:/Users/rnemausat/.deno/bin:/Users/rnemausat/.pyenv/shims:/Users/rnemausat/.pyenv/bin:/Users/rnemausat/.nvm/versions/node/v16.13.2/bin:/usr/local/sbin:/Users/rnemausat/.deno/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/go/bin:/Library/Apple/usr/bin:/Users/rnemausat/.cargo/bin:/Users/rnemausat/.local/bin:/Users/rnemausat/.fig/bin:/Users/rnemausat/.local/bin:/Users/rnemausat/.local/bin:/Users/rnemausat/Library/Android/sdk/emulator:/Users/rnemausat/Library/Android/sdk/tools:/Users/rnemausat/Library/Android/sdk/tools/bin:/Users/rnemausat/Library/Android/sdk/platform-tools:/Users/rnemausat/flutter/bin:/Users/rnemausat/go/bin:/Users/rnemausat/.local/bin:/Users/rnemausat/.local/bin:/Users/rnemausat/Library/Android/sdk/emulator:/Users/rnemausat/Library/Android/sdk/tools:/Users/rnemausat/Library/Android/sdk/tools/bin:/Users/rnemausat/Library/Android/sdk/platform-tools:/Users/rnemausat/flutter/bin:/Users/rnemausat/go/bin
+
+Yarn version: 
+  1.22.18
+
+Node version: 
+  16.13.2
+
+Platform: 
+  darwin x64
+
+Trace: 
+  Error: canceled
+      at Interface.<anonymous> (/usr/local/Cellar/yarn/1.22.18/libexec/lib/cli.js:137143:13)
+      at Interface.emit (node:events:390:28)
+      at Interface._ttyWrite (node:readline:1081:16)
+      at ReadStream.onkeypress (node:readline:288:10)
+      at ReadStream.emit (node:events:390:28)
+      at emitKeys (node:internal/readline/utils:358:14)
+      at emitKeys.next (<anonymous>)
+      at ReadStream.onData (node:internal/readline/emitKeypressEvents:61:36)
+      at ReadStream.emit (node:events:390:28)
+      at addChunk (node:internal/streams/readable:315:12)
+
+npm manifest: 
+  {
+    "name": "nft-collection",
+    "version": "1.0.0",
+    "main": "index.js",
+    "license": "MIT",
+    "scripts": {
+      "dev": "npx hardhat run scripts/sample-script.js"
+    },
+    "devDependencies": {
+      "@nomiclabs/hardhat-ethers": "^2.0.0",
+      "@nomiclabs/hardhat-waffle": "^2.0.0",
+      "chai": "^4.2.0",
+      "ethereum-waffle": "^3.0.0",
+      "ethers": "^5.0.0",
+      "hardhat": "^2.9.3"
+    },
+    "dependencies": {
+      "@openzeppelin/contracts": "^4.5.0"
+    }
+  }
+
+yarn manifest: 
+  No manifest
+
+Lockfile: 
+  No lockfile