npm run devでのエラー

Question

laravelでnpm run devを実行したところ、エラーが出ました。
ログイン認証系のphp artisan make:authを導入した後に発生したのですが、いまいちエラーが解消せずに困っております。
検索していると、app.scssのbootstrapを読み込めていない事が原因とありましたので、bootstrapを試しにコメントアウトしたのですが、再度発生しています。（読み込んでない？）
下記のcss-loader配下のindex.jsも存在しておりますし、どのようにエラーを追跡すればいいのか等もわからず困っております。。
バージョン、エラー内容は下記の通りです。

npm 　　　　　　　　　6.9.0
php artisan --version　PHP 7.2.11 (cli)

npm run dev実行ログ

> @ dev /var/www/nasu
> npm run development


> @ development /var/www/nasu
> cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js

98% after emitting SizeLimitsPlugin

 ERROR  Failed to compile with 2 errors                                                                                                                                                                        12:25:51 PM

 error  in ./resources/sass/app.scss

Module build failed (from ./node_modules/css-loader/index.js):
ModuleBuildError: Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
ValidationError: Invalid options object. Sass Loader has been initialized using an options object that does not match the API schema.
 - options has an unknown property 'outputStyle'. These properties are valid:
   object { implementation?, sassOptions?, prependData?, sourceMap?, webpackImporter? }
    at validate (/var/www/nasu/node_modules/sass-loader/node_modules/schema-utils/dist/validate.js:85:11)
    at Object.loader (/var/www/nasu/node_modules/sass-loader/dist/index.js:36:28)
    at runLoaders (/var/www/nasu/node_modules/webpack/lib/NormalModule.js:316:20)
    at /var/www/nasu/node_modules/loader-runner/lib/LoaderRunner.js:367:11
    at /var/www/nasu/node_modules/loader-runner/lib/LoaderRunner.js:233:18
    at runSyncOrAsync (/var/www/nasu/node_modules/loader-runner/lib/LoaderRunner.js:143:3)
    at iterateNormalLoaders (/var/www/nasu/node_modules/loader-runner/lib/LoaderRunner.js:232:2)
    at /var/www/nasu/node_modules/loader-runner/lib/LoaderRunner.js:205:4
    at process.nextTick (/var/www/nasu/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js:85:15)
    at process._tickCallback (internal/process/next_tick.js:61:11)

 error  in ./resources/sass/app.scss

Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
ValidationError: Invalid options object. Sass Loader has been initialized using an options object that does not match the API schema.
 - options has an unknown property 'outputStyle'. These properties are valid:
   object { implementation?, sassOptions?, prependData?, sourceMap?, webpackImporter? }
    at validate (/var/www/nasu/node_modules/sass-loader/node_modules/schema-utils/dist/validate.js:85:11)
    at Object.loader (/var/www/nasu/node_modules/sass-loader/dist/index.js:36:28)

 @ ./resources/sass/app.scss 2:14-253

     Asset      Size   Chunks             Chunk Names
/js/app.js  1.39 MiB  /js/app  [emitted]  /js/app

ERROR in ./resources/sass/app.scss
Module build failed (from ./node_modules/css-loader/index.js):
ModuleBuildError: Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
ValidationError: Invalid options object. Sass Loader has been initialized using an options object that does not match the API schema.
 - options has an unknown property 'outputStyle'. These properties are valid:
   object { implementation?, sassOptions?, prependData?, sourceMap?, webpackImporter? }
    at validate (/var/www/nasu/node_modules/sass-loader/node_modules/schema-utils/dist/validate.js:85:11)
    at Object.loader (/var/www/nasu/node_modules/sass-loader/dist/index.js:36:28)
    at runLoaders (/var/www/nasu/node_modules/webpack/lib/NormalModule.js:316:20)
    at /var/www/nasu/node_modules/loader-runner/lib/LoaderRunner.js:367:11
    at /var/www/nasu/node_modules/loader-runner/lib/LoaderRunner.js:233:18
    at runSyncOrAsync (/var/www/nasu/node_modules/loader-runner/lib/LoaderRunner.js:143:3)
    at iterateNormalLoaders (/var/www/nasu/node_modules/loader-runner/lib/LoaderRunner.js:232:2)
    at /var/www/nasu/node_modules/loader-runner/lib/LoaderRunner.js:205:4
    at process.nextTick (/var/www/nasu/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js:85:15)
    at process._tickCallback (internal/process/next_tick.js:61:11)
 @ ./resources/sass/app.scss

ERROR in ./resources/sass/app.scss (./node_modules/css-loader??ref--5-2!./node_modules/postcss-loader/src??postcss0!./node_modules/resolve-url-loader??ref--5-4!./node_modules/sass-loader/dist/cjs.js??ref--5-5!./resources/sass/app.scss)
Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
ValidationError: Invalid options object. Sass Loader has been initialized using an options object that does not match the API schema.
 - options has an unknown property 'outputStyle'. These properties are valid:
   object { implementation?, sassOptions?, prependData?, sourceMap?, webpackImporter? }
    at validate (/var/www/nasu/node_modules/sass-loader/node_modules/schema-utils/dist/validate.js:85:11)
    at Object.loader (/var/www/nasu/node_modules/sass-loader/dist/index.js:36:28)
 @ ./resources/sass/app.scss 2:14-253
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! @ development: `cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js`
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!     /home/nasutaro/.npm/_logs/2020-03-28T03_25_51_654Z-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!     /home/nasutaro/.npm/_logs/2020-03-28T03_25_51_731Z-debug.log

cat /var/www/nasu/node_modules/css-loader/index.js
/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
module.exports = require("./lib/loader");

cat app.scss

// Fonts
@import url('https://fonts.googleapis.com/css?family=Nunito');

// Variables
@import 'variables';

// Bootstrap
//@import '~bootstrap/scss/bootstrap';

Comments

[hayato7]

package.jsonの内容も見せていただけないでしょうか。

[nasu8803]

hayato7さん

下記の内容になります。
cat package.json
```
{
"private": true,
"scripts": {
"dev": "npm run development",
"development": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
"watch": "npm run development -- --watch",
"watch-poll": "npm run watch -- --watch-poll",
"hot": "cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
"prod": "npm run production",
"production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --no-progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
},
"devDependencies": {
"axios": "^0.19",
"bootstrap": "^4.0.0",
"cross-env": "^5.1",
"jquery": "^3.2",
"laravel-mix": "^4.0.7",
"lodash": "^4.17.13",
"popper.js": "^1.12",
"resolve-url-loader": "^2.3.1",
"sass": "^1.20.1",
"sass-loader": "^8.0.0",
"vue": "^2.5.17",
"vue-template-compiler": "^2.6.10"
}
}
```

Answer 1

hayato7さんの言う通り、sass-loaderをダウングレードしたらいけました！
ありがとうございます。

"sass-loader": "^7.1.0",

Answer 2

追記していただいた内容から、

"laravel-mix": "^4.0.7",
"sass-loader": "^8.0.0",

この二つのバージョンによる問題のように思われます。
laravel-mixのバージョンを5.x系にアップするか、
sass-loaderのバージョン7.x系に下げるかどちらかの対応になると思います。

詳しくはこちらをご覧ください。