MacにNode.jsをインストールしてバージョン管理する方法

% brew install fnm
（中略）
==> Pouring fnm--1.31.0.arm64_monterey.bottle.tar.gz
==> Caveats
zsh completions have been installed to:
  /opt/homebrew/share/zsh/site-functions
==> Summary
🍺  /opt/homebrew/Cellar/fnm/1.31.0: 11 files, 7MB
==> Running `brew cleanup fnm`...
Disable this behaviour by setting HOMEBREW_NO_INSTALL_CLEANUP.
Hide these hints with HOMEBREW_NO_ENV_HINTS (see `man brew`).

% echo 'eval "$(fnm env --use-on-cd)"' >> ~/.zshrc
% source ~/.zshrc

% fnm help
fnm 1.31.0
A fast and simple Node.js manager

USAGE:
    fnm [OPTIONS] <SUBCOMMAND>

OPTIONS:
        --arch <ARCH>
            Override the architecture of the installed Node binary. Defaults to arch of fnm binary
            [env: FNM_ARCH]

        --fnm-dir <BASE_DIR>
            The root directory of fnm installations [env: FNM_DIR]

    -h, --help
            Print help information

        --log-level <LOG_LEVEL>
            The log level of fnm commands [env: FNM_LOGLEVEL] [default: info] [possible values:
            quiet, info, all, error]

        --node-dist-mirror <NODE_DIST_MIRROR>
            https://nodejs.org/dist/ mirror [env: FNM_NODE_DIST_MIRROR] [default:
            https://nodejs.org/dist]

    -V, --version
            Print version information

        --version-file-strategy <VERSION_FILE_STRATEGY>
            A strategy for how to resolve the Node version. Used whenever `fnm use` or `fnm install`
            is called without a version, or when `--use-on-cd` is configured on evaluation [env:
            FNM_VERSION_FILE_STRATEGY] [default: local] [possible values: local, recursive]

SUBCOMMANDS:
    alias          Alias a version to a common name
    completions    Print shell completions to stdout
    current        Print the current Node.js version
    default        Set a version as the default version
    env            Print and set up required environment variables for fnm
    exec           Run a command within fnm context
    help           Print this message or the help of the given subcommand(s)
    install        Install a new Node.js version
    list           List all locally installed Node.js versions [aliases: ls]
    list-remote    List all remote Node.js versions [aliases: ls-remote]
    unalias        Remove an alias definition
    uninstall      Uninstall a Node.js version
    use            Change Node.js version

% fnm list-remote
（中略）
v16.13.0 (Gallium)
v16.13.1 (Gallium)
v16.13.2 (Gallium)
v16.14.0 (Gallium)
v16.14.1 (Gallium)
v16.14.2 (Gallium)
v17.0.0
v17.0.1
v17.1.0
v17.2.0
v17.3.0
v17.3.1
v17.4.0
v17.5.0
v17.6.0
v17.7.0
v17.7.1
v17.7.2
v17.8.0
v17.9.0

% fnm install v17.9.0  #バージョンを指定してインストール
% fnm install v16      #v16の最新版をインストール

% fnm list
* v16.14.2
* v17.9.0 default
* system

% fnm default v17.9.0
% fnm list
* v16.14.2
* v17.9.0 default
* system

% cd project-a             #プロジェクトのディレクトリに移動
% fnm use v16.14.2         #バージョンを切り替える
% node -v > .node-version  #現在のバージョンを .node-version に記述
% node -v                  #バージョンを確認
v16.14.2

% echo "v15.14.0" > project-b/.node-version #プロジェクトのディレクトリに .node-version を設置
% cd project-b                              #プロジェクトのディレクトリに移動
Can't find an installed Node version matching v15.14.0.
Do you want to install it? answer [y/n]: y
Installing Node v15.14.0 (x64)
Using Node v15.14.0
% node -v
v15.14.0