npm をインストールしておいてください。

下記「npx hardhat」コマンドを実行すると「What do you want to do?」と聞かれますので、今回は「Create an empty hardhat.config.js」で作業を進めます。

> mkdir hardhat_project
> cd hardhat_project
hardhat_project> npx hardhat
Need to install the following packages:
  hardhat
Ok to proceed? (y) y
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888    888 888  888 888    Y88b 888 888  888 888  888 Y88b.
888    888  Y888888 888      Y88888 888  888  Y888888   Y888
 
Welcome to Hardhat v2.9.3
 
? What do you want to do? …
  Create a sample project
  Create an advanced sample project
  Create an advanced sample project that uses TypeScript
❯ Create an empty hardhat.config.js
  Quit
 
√ What do you want to do? · Create an empty hardhat.config.js
Config file created
 
You need to install hardhat locally to use it. Please run:   
 
npm install --save-dev "hardhat@^2.9.3"
 
hardhat_project> npm install --save-dev hardhat

生成されたファイルを確認してみます。

hardhat_project> ls
 
 
    ディレクトリ: C:\Users\shinobu\NoNameSeminer\ethereum\hardhat_project
 
 
Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
d-----        2022/05/11     11:20                node_modules
-a----        2022/05/11     11:18            103 hardhat.config.js
-a----        2022/05/11     11:20         229321 package-lock.json
-a----        2022/05/11     11:20             84 package.json

Hardhat の設定ファイル「hardhat.config.js」と、npm の設定ファイル「package.json」「package-lock.json」、npm パッケージを保存するディレクトリ 「node_modules」が作成されています。

hardhat.config.js を確認すると、使用する Solidity のバージョンのみが設定されています。

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
module.exports = {
  solidity: "0.7.3",
};

Hardhat のバージョンとコマンドの仕様を確認してみます。

hardhat_project> npx hardhat        
Hardhat version 2.9.3
 
Usage: hardhat [GLOBAL OPTIONS] <TASK> [TASK OPTIONS]
 
GLOBAL OPTIONS:
 
  --config              A Hardhat config file.
  --emoji               Use emoji in messages.
  --help                Shows this message, or a task's help if its name is provided
  --max-memory          The maximum amount of memory that Hardhat can use.
  --network             The network to connect to.
  --show-stack-traces   Show stack traces.
  --tsconfig            A TypeScript config file.
  --verbose             Enables Hardhat verbose logging
  --version             Shows hardhat's version.
 
 
AVAILABLE TASKS:
 
  check         Check whatever you need
  clean         Clears the cache and deletes all artifacts
  compile       Compiles the entire project, building all artifacts
  console       Opens a hardhat console
  flatten       Flattens and prints contracts and their dependencies
  help          Prints this message
  node          Starts a JSON-RPC server on top of Hardhat Network
  run           Runs a user-defined script after compiling the project
  test          Runs mocha tests
 
To get help for a specific task run: npx hardhat help [task]