laravel-mixのコンパイルでSyntaxError: Unexpected token = と怒られたら

# 発生したエラー
laravel-mixでコンパイルしたところ下記のエラーで怒られた
触ってないファイルでsyntax errorとか言われて困った

```shell-session:ubuntu
# npm run dev
npm WARN npm npm does not support Node.js v10.23.1
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 4, 6, 7, 8, 9.
npm WARN npm You can find the latest version at https://nodejs.org/

> @ dev /var/www/vue-laravel-spa
> npm run development

npm WARN npm npm does not support Node.js v10.23.1
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 4, 6, 7, 8, 9.
npm WARN npm You can find the latest version at https://nodejs.org/

> @ development /var/www/vue-laravel-spa
> mix

[webpack-cli] /var/www/vue-laravel-spa/node_modules/laravel-mix/src/Mix.js:18
    static _primary = null;
                    ^

SyntaxError: Unexpected token =
    at new Script (vm.js:83:7)
    at NativeCompileCache._moduleCompile (/var/www/vue-laravel-spa/node_modules/v8-compile-cache/v8-compile-cache.js:240:18)
    at Module._compile (/var/www/vue-laravel-spa/node_modules/v8-compile-cache/v8-compile-cache.js:184:36)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (/var/www/vue-laravel-spa/node_modules/v8-compile-cache/v8-compile-cache.js:159:20)
    at module.exports (/var/www/vue-laravel-spa/node_modules/laravel-mix/setup/webpack.config.js:2:17)
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! @ development: `mix`
npm ERR! Exit status 2
npm ERR! 
npm ERR! Failed at the @ development script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2021-01-23T09_26_30_393Z-debug.log
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! @ dev: `npm run development`
npm ERR! Exit status 2
npm ERR! 
npm ERR! Failed at the @ dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2021-01-23T09_26_30_443Z-debug.log
```

# 環境

```
% sw_vers
ProductName:    Mac OS X
ProductVersion: 10.15.7
BuildVersion:   19H2

% docker version
Client: Docker Engine - Community
 Cloud integration: 1.0.1
 Version:           19.03.13
 API version:       1.40

# php -v
PHP 7.4.7 (cli) (built: Jun 11 2020 18:41:17) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Xdebug v3.0.2, Copyright (c) 2002-2021, by Derick Rethans

# php artisan -v
Laravel Framework 8.24.0
```

# 原因
ググりまくった結果こちらのサイトに辿り着いた
https://github.com/JeffreyWay/laravel-mix/issues/2570
どうやらnode.jsのバージョンを最新にすると直るらしい

# 対処
こちらの記事を参考に対処した
https://qiita.com/seibe/items/36cef7df85fe2cefa3ea
https://qiita.com/kiwi-bird/items/e3e551938d09282cf4ee
今回初めて知ったのだが`n package`を使うことでnpmパッケージとnode.js自体のバージョン管理をしてくれるらしい
こんな便利なものがあったのか

というわけで`n package`をインストールする

```shell-session:ubuntu
# npm install n -g  # グローバルにインストールする
npm WARN npm npm does not support Node.js v10.23.1
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 4, 6, 7, 8, 9.
npm WARN npm You can find the latest version at https://nodejs.org/
/usr/local/bin/n -> /usr/local/lib/node_modules/n/bin/n
+ n@7.0.0
added 1 package from 4 contributors in 0.858s

# n stable  # 最新のnodejsをインストール
  installing : node-v14.15.4
       mkdir : /usr/local/n/versions/node/14.15.4
       fetch : https://nodejs.org/dist/v14.15.4/node-v14.15.4-linux-x64.tar.xz
   installed : v14.15.4 (with npm 6.14.10)

Note: the node command changed location and the old location may be remembered in your current shell.
         old : /usr/bin/node
         new : /usr/local/bin/node
To reset the command location hash either start a new shell, or execute PATH="$PATH"

# apt purge -y nodejs npm   # aptで入れた古いnodejsとnpmを削除
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  gyp javascript-common libbrotli1 libc-ares2 libexpat1 libjs-inherits libjs-is-typedarray libnode-dev libnode64 libpython-stdlib
  libpython2-stdlib libpython2.7-minimal libpython2.7-stdlib libreadline7 libssl-dev libuv1 libuv1-dev lsb-base mime-support nodejs-doc python
  python-minimal python-pkg-resources python2 python2-minimal python2.7 python2.7-minimal
Use 'apt autoremove' to remove them.
The following packages will be REMOVED:
  node-abbrev* node-ajv* node-ansi* node-ansi-align* node-ansi-regex* node-ansi-styles* node-ansistyles* node-aproba* node-archy*
  node-are-we-there-yet* node-asn1* node-assert-plus* node-asynckit* node-aws-sign2* node-aws4* node-balanced-match* node-bcrypt-pbkdf*
  node-bluebird* node-boxen* node-brace-expansion* node-builtin-modules* node-builtins* node-cacache* node-call-limit* node-camelcase*
  node-caseless* node-chalk* node-chownr* node-cli-boxes* node-cliui* node-clone* node-co* node-color-convert* node-color-name*
  node-combined-stream* node-concat-map* node-concat-stream* node-config-chain* node-console-control-strings* node-copy-concurrently*
  node-core-util-is* node-cross-spawn* node-cyclist* node-dashdash* node-decamelize* node-decompress-response* node-deep-extend* node-defaults*
  node-delayed-stream* node-delegates* node-detect-indent* node-detect-newline* node-duplexer3* node-duplexify* node-ecc-jsbn* node-editor*
  node-encoding* node-end-of-stream* node-errno* node-escape-string-regexp* node-execa* node-extend* node-extsprintf* node-find-up*
  node-flush-write-stream* node-forever-agent* node-form-data* node-from2* node-fs-vacuum* node-fs-write-stream-atomic* node-fs.realpath*
  node-gauge* node-get-caller-file* node-get-stream* node-getpass* node-glob* node-got* node-graceful-fs* node-gyp* node-har-schema*
  node-har-validator* node-has-flag* node-has-symbol-support-x* node-has-to-string-tag-x* node-has-unicode* node-hosted-git-info*
  node-http-signature* node-iconv-lite* node-iferr* node-import-lazy* node-imurmurhash* node-inflight* node-inherits* node-ini* node-invert-kv*
  node-is-builtin-module* node-is-npm* node-is-object* node-is-plain-obj* node-is-retry-allowed* node-is-stream* node-is-typedarray*
  node-isarray* node-isexe* node-isstream* node-isurl* node-jsbn* node-json-parse-better-errors* node-json-schema* node-json-stable-stringify*
  node-json-stringify-safe* node-jsonify* node-jsonparse* node-jsonstream* node-jsprim* node-latest-version* node-lazy-property* node-lcid*
  node-libnpx* node-locate-path* node-lockfile* node-lowercase-keys* node-lru-cache* node-mem* node-mime-types* node-mimic-fn*
  node-mimic-response* node-minimatch* node-minimist* node-mississippi* node-mkdirp* node-move-concurrently* node-mute-stream* node-node-uuid*
  node-nopt* node-normalize-package-data* node-npm-package-arg* node-npm-run-path* node-npmlog* node-oauth-sign* node-object-assign* node-once*
  node-opener* node-os-locale* node-osenv* node-p-cancelable* node-p-finally* node-p-limit* node-p-locate* node-p-timeout* node-package-json*
  node-parallel-transform* node-path-exists* node-path-is-absolute* node-path-is-inside* node-performance-now* node-prepend-http*
  node-process-nextick-args* node-promise-inflight* node-promzard* node-proto-list* node-prr* node-pump* node-pumpify* node-punycode* node-qs*
  node-qw* node-rc* node-read* node-read-package-json* node-readable-stream* node-registry-auth-token* node-registry-url* node-request*
  node-require-directory* node-require-main-filename* node-resolve-from* node-retry* node-rimraf* node-run-queue* node-safe-buffer* node-semver*
  node-semver-diff* node-set-blocking* node-sha* node-shebang-command* node-shebang-regex* node-signal-exit* node-slash* node-slide*
  node-sorted-object* node-spdx-correct* node-spdx-expression-parse* node-spdx-license-ids* node-sshpk* node-ssri* node-stream-each*
  node-stream-iterate* node-stream-shift* node-string-decoder* node-string-width* node-strip-ansi* node-strip-eof* node-strip-json-comments*
  node-supports-color* node-tar* node-term-size* node-text-table* node-through* node-through2* node-timed-out* node-tough-cookie*
  node-tunnel-agent* node-tweetnacl* node-typedarray* node-uid-number* node-unique-filename* node-unpipe* node-url-parse-lax*
  node-url-to-options* node-util-deprecate* node-uuid* node-validate-npm-package-license* node-validate-npm-package-name* node-verror*
  node-wcwidth.js* node-which* node-which-module* node-wide-align* node-widest-line* node-wrap-ansi* node-wrappy* node-write-file-atomic*
  node-xdg-basedir* node-xtend* node-y18n* node-yallist* node-yargs* node-yargs-parser* nodejs* npm*
0 upgraded, 0 newly installed, 241 to remove and 18 not upgraded.
After this operation, 16.7 MB disk space will be freed.
(Reading database ... 19266 files and directories currently installed.)
Removing npm (5.8.0+ds6-4+deb10u2) ...
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Removing node-string-decoder (1.2.0-1) ...
Removing node-safe-buffer (5.1.2-1) ...
Removing node-util-deprecate (1.0.2-1) ...
Removing node-wrappy (1.0.2-1) ...
Removing node-strip-ansi (4.0.0-1) ...
Removing node-ansi-regex (3.0.0-1) ...
Removing nodejs (10.23.1~dfsg-1~deb10u1) ...
(Reading database ... 14507 files and directories currently installed.)
Purging configuration files for npm (5.8.0+ds6-4+deb10u2) ...

##### 一度ログインしなおす #######

# npm run dev   # いざコンパイル

> @ dev /var/www/vue-laravel-spa
> npm run development


> @ development /var/www/vue-laravel-spa
> mix

 	Additional dependencies must be installed. This will only take a moment.
 
 	Running: npm install vue-loader@^15.9.5 --save-dev --legacy-peer-deps
 
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.13 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@2.3.1 (node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.3.1: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

 	Finished. Please run Mix again.
 

# npm run dev   # againとのことなので

> @ dev /var/www/vue-laravel-spa
> npm run development


> @ development /var/www/vue-laravel-spa
> mix

99% done plugins BuildOutputPlugin


                         
   Laravel Mix v6.0.10   
                         

✔ Compiled Successfully in 16791ms
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬─────────┐
│                                                                                                                                  File │ Size    │
├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼─────────┤
│                                                                                                                            /js/app.js │ 1.4 MiB │
│                                                                                                                           css/app.css │ 179 KiB │
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴─────────┘

```

成功しました
`/public/js/app.js`と`/public/css/app.css`が生成されました