Sass-loader requires node-sass >=4 even if that exist : <p>I executed a update to angular 6. And during ng serve -o I receive error that sass-loader expect node-sass. 
After run ng serve -o I receive:</p>

<pre><code>ERROR in ./src/sass/styles.scss (./node_modules/raw-loader!./node_modules/postcss-loader/lib??embedded!./node_modules/sass-loader/lib/loader.js??ref--14-3!./src/sass/styles.scss)
    Module build failed: Error: `sass-loader` requires `node-sass` &gt;=4. Please install a compatible version.
    at Object.sassLoader (node_modules\sass-loader\lib\loader.js:31:19)
ERROR in ./src/app/app.component.scss
Module build failed: Error: `sass-loader` requires `node-sass` &gt;=4. Please install a compatible version.
    at Object.sassLoader (node_modules\sass-loader\lib\loader.js:31:19)
ERROR in x.component.scss
Module build failed: Error: `sass-loader` requires `node-sass` &gt;=4. Please install a compatible version.
    at Object.sassLoader (\node_modules\sass-loader\lib\loader.js:31:19)
ERROR in x.component.scss
Module build failed: Error: `sass-loader` requires `node-sass` &gt;=4. Please install a compatible version.
    at Object.sassLoader (loader.js:31:19)
ERROR in .x.component.scss
Module build failed: Error: `sass-loader` requires `node-sass` &gt;=4. Please install a compatible version.
    at Object.sassLoader (node_modules\sass-loader\lib\loader.js:31:19)
</code></pre>

<p>Obvisously I check everything (in my opinion) and I don't have idea what's going on.</p>

<p>Package.Json:</p>

<pre><code>"devDependencies": {
"@angular-devkit/build-angular": "~0.6.0",
"@angular/cli": "6.0.0",
"@angular/compiler-cli": "6.0.0",
"@angular/language-service": "6.0.0",
"@types/jasmine": "~2.8.3",
"@types/jasminewd2": "~2.0.2",
"@types/node": "~6.0.106",
"codelyzer": "^4.0.1",
"jasmine-core": "~2.8.0",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~2.0.0",
"karma-chrome-launcher": "~2.2.0",
"karma-html-detailed-reporter": "^1.1.21",
"karma-jasmine": "~1.1.0",
"karma-jasmine-html-reporter": "^0.2.2",
"karma-phantomjs-launcher": "^1.0.4",
"karma-teamcity-reporter": "^1.1.0",
"phantomjs-prebuilt": "^2.1.16",
"protractor": "~5.1.2",
"node-sass": "^4.9.0",
"sass-loader": "^7.0.1",
"ts-node": "~4.1.0",
"tslint": "~5.9.1",
"typescript": "2.7.2"
}
</code></pre>

<p>dir -l node_modules says:</p>

<pre><code>...
05/07/2018  08:53 AM    &lt;DIR&gt;          node-sass
...
05/07/2018  08:53 AM    &lt;DIR&gt;          sass-loader
...
</code></pre>

<p>I executed:</p>

<pre><code>npm rebuild node-sass 
</code></pre>

<p>and secod approach:
I removed local node-module together with %User%\AppData\Roaming\npm-cache. then I removed lock file and execuded npm </p>

<pre><code>npm cache clear --force
npm install
</code></pre>

<p>But still no success.</p>

<p>What do I miss ?</p>
