Laravel6系でログイン機能作成時にnpm run devが上手くいかない

前提・実現したいこと

こちらの記事を参考にLaravelでログイン機能を作成しようとしています。
参考記事

その際のこちらをdockerのコンテナ内で実行したのですが以下のエラーが発生し、状況、解決方法が分からない状態になっています。

$ npm run dev

発生している問題・エラーメッセージ

> @ dev /var/www/html/[project-name]
> npm run development


> @ development /var/www/html/[project-name]
> 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                                                                                                                                                                                                            12:24:13 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/html/[project-name]/node_modules/sass-loader/node_modules/schema-utils/dist/validate.js:85:11)
    at Object.loader (/var/www/html/[project-name]/node_modules/sass-loader/dist/index.js:36:28)
    at runLoaders (/var/www/html/[project-name]/node_modules/webpack/lib/NormalModule.js:316:20)
    at /var/www/html/[project-name]/node_modules/loader-runner/lib/LoaderRunner.js:367:11
    at /var/www/html/[project-name]/node_modules/loader-runner/lib/LoaderRunner.js:233:18
    at runSyncOrAsync (/var/www/html/[project-name]/node_modules/loader-runner/lib/LoaderRunner.js:143:3)
    at iterateNormalLoaders (/var/www/html/[project-name]/node_modules/loader-runner/lib/LoaderRunner.js:232:2)
    at /var/www/html/[project-name]/node_modules/loader-runner/lib/LoaderRunner.js:205:4
    at process.nextTick (/var/www/html/[project-name]/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/html/[project-name]/node_modules/sass-loader/node_modules/schema-utils/dist/validate.js:85:11)
    at Object.loader (/var/www/html/[project-name]/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/html/[project-name]/node_modules/sass-loader/node_modules/schema-utils/dist/validate.js:85:11)
    at Object.loader (/var/www/html/[project-name]/node_modules/sass-loader/dist/index.js:36:28)
    at runLoaders (/var/www/html/[project-name]/node_modules/webpack/lib/NormalModule.js:316:20)
    at /var/www/html/[project-name]/node_modules/loader-runner/lib/LoaderRunner.js:367:11
    at /var/www/html/[project-name]/node_modules/loader-runner/lib/LoaderRunner.js:233:18
    at runSyncOrAsync (/var/www/html/[project-name]/node_modules/loader-runner/lib/LoaderRunner.js:143:3)
    at iterateNormalLoaders (/var/www/html/[project-name]/node_modules/loader-runner/lib/LoaderRunner.js:232:2)
    at /var/www/html/[project-name]/node_modules/loader-runner/lib/LoaderRunner.js:205:4
    at process.nextTick (/var/www/html/[project-name]/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/html/[project-name]/node_modules/sass-loader/node_modules/schema-utils/dist/validate.js:85:11)
    at Object.loader (/var/www/html/[project-name]/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!     /root/.npm/_logs/2020-03-06T12_24_13_191Z-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/2020-03-06T12_24_13_212Z-debug.log

初めての投稿で不足している情報などもあるかと思いますが追記しますので、よろしくお願いします。