n の更新（npmのバージョン管理ツール）＆ typescriptを最新バージョンに更新

今回やったこと

• npmのバージョン管理ツールnの更新
• typescriptを最新バージョンに更新(3.7.4→4.0.2)

mba-2:~ #{myname}$ n list
node/14.5.0
mba-2:~ #{myname}$ n latest

  installing : node-v14.11.0
       mkdir : /usr/local/n/versions/node/14.11.0
mkdir: /usr/local/n/versions/node/14.11.0: Permission denied

  Error: sudo required (or change ownership, or define N_PREFIX)

mba-2:~ #{myname}$ n --stable
12.18.4
mba-2:~ #{myname}$ n --version
6.6.0
mba-2:~ #{myname}$ sudo n stable  #sudoコマンドじゃないとできなかった。
Password:

  installing : node-v12.18.4
       mkdir : /usr/local/n/versions/node/12.18.4
       fetch : https://nodejs.org/dist/v12.18.4/node-v12.18.4-darwin-x64.tar.xz
   installed : v12.18.4

mba-2:~ #{myname}$ n --version
6.6.0
mba-2:~ #{myname}$ node -v
v12.18.4
mba-2:~ #{myname}$ sudo npm update -g npm　#TypeScriptをnpmで最新バージョンに更新する方法
/Users/#{myname}/bin/npx -> /Users/#{myname}/lib/node_modules/npm/bin/npx-cli.js
/Users/#{myname}/bin/npm -> /Users/#{myname}/lib/node_modules/npm/bin/npm-cli.js
+ npm@6.14.8
added 18 packages from 4 contributors, removed 14 packages and updated 43 packages in 13.178s
mba-2:~ #{myname}$ tsc --version
Version 3.7.4
mba-2:~ #{myname}$ npm install -g typescript@stable #stableなんてコマンドはそもそも存在しない。
npm ERR! code ETARGET
npm ERR! notarget No matching version found for typescript@stable.
npm ERR! notarget In most cases you or one of your dependencies are requesting
npm ERR! notarget a package version that doesn't exist.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/#{myname}/.npm/_logs/2020-09-16T14_08_20_183Z-debug.log
mba-2:~ #{myname}$ npm install -g typescript@latest
/Users/#{myname}/bin/tsc -> /Users/#{myname}/lib/node_modules/typescript/bin/tsc
/Users/#{myname}/bin/tsserver -> /Users/#{myname}/lib/node_modules/typescript/bin/tsserver
+ typescript@4.0.2
updated 1 package in 1.814s
mba-2:~ #{myname}$ tsc --version
Version 4.0.2

参考にした記事（いつもありがとうございます）

https://qastack.jp/programming/39677437/how-to-update-typescript-to-latest-version-with-npm
https://stackoverflow.com/questions/39677437/how-to-update-typescript-to-latest-version-with-npm