How can I fix error npm run dev in laravel 6

Question

I have an error with npm when install in Laravel 6 it's now working I don't know despite of i did all the steps in order

this are my versions:
Laravel version 6
npm 6.13.7
Node 13.5.0

I did the commends in order

composer require laravel/ui --dev
php artisan ui vue --auth 
npm install 
npm run dev

but when do npm run dev it's error show

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 (D:\project\laravel\node_modules\sass-loader\node_modules\schema-utils\dist\validate.js:85:11) at Object.loader (D:\project\laravel\node_modules\sass-loader\dist\index.js:36:28) at D:\project\laravel\node_modules\webpack\lib\NormalModule.js:316:20 at D:\project\laravel\node_modules\loader-runner\lib\LoaderRunner.js:367:11 at D:\project\laravel\node_modules\loader-runner\lib\LoaderRunner.js:233:18 at runSyncOrAsync (D:\project\laravel\node_modules\loader-runner\lib\LoaderRunner.js:143:3) at iterateNormalLoaders (D:\project\laravel\node_modules\loader-runner\lib\LoaderRunner.js:232:2) at D:\project\laravel\node_modules\loader-runner\lib\LoaderRunner.js:205:4 at D:\project\laravel\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:85:15 at processTicksAndRejections (internal/process/task_queues.js:79:11) @ ./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 (D:\project\laravel\node_modules\sass-loader\node_modules\schema-utils\dist\validate.js:85:11) at Object.loader (D:\project\laravel\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!
C:\Users\Ahmed\AppData\Roaming\npm-cache_logs\2020-02-22T21_12_44_218Z-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!
C:\Users\Ahmed\AppData\Roaming\npm-cache_logs\2020-02-22T21_12_44_441Z-debug.log

and this my 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",
        "start": "webpack-dev-server --hot"
    },
    "devDependencies": {
        "axios": "^0.19",
        "bootstrap": "^4.0.0",
        "bootstrap-sass": "^3.3.7",
        "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"
    },
    "dependencies": {
        "node-sass": "^4.13.1",
        "webpack": "^4.41.6"
    }
}

Thanks

Answer 1

Had same error, solved by reinstalling sass-loader v7.1

npm uninstall --save-dev sass-loader
npm install --save-dev [email protected]