问Parcel-Angular5 :如何添加SCSS/SASS支持？

EN

ng set defaults.styleExt scss

@Component({
  selector: 'app-logged-in',
  templateUrl: './logged-in.component.html',
  styleUrls: ['./logged-in.component.scss']
})

$fg:#00bcd4;

.topMenu{
  display: flex; // <-- interpreted
  background-color: $fg; // <-- not interpreted
}

npm i node-sass -S
npm i sass-loader -S

{
  "name": "web.ui",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "parcel": "parcel",
    "start": "parcel ./src/index.html --no-cache",
    "build": "parcel build ./src/index.html  --no-cache"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^5.0.0",
    "@angular/common": "^5.0.0",
    "@angular/compiler": "^5.0.0",
    "@angular/core": "^5.0.0",
    "@angular/forms": "^5.0.0",
    "@angular/http": "^5.0.0",
    "@angular/platform-browser": "^5.0.0",
    "@angular/platform-browser-dynamic": "^5.0.0",
    "@angular/router": "^5.0.0",
    "core-js": "^2.4.1",
    "parcel-plugin-inlinesvg": "0.0.12",
    "rxjs": "^5.5.2",
    "zone.js": "^0.8.14"
  },
  "devDependencies": {
    "@angular/cli": "1.6.6",
    "@angular/compiler-cli": "^5.0.0",
    "@angular/language-service": "^5.0.0",
    "@types/jasmine": "~2.5.53",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "~6.0.60",
    "codelyzer": "^4.0.1",
    "eslint": "4.16.0",
    "eslint-config-prettier": "2.9.0",
    "eslint-plugin-prettier": "2.6.0",
    "jasmine-core": "~2.6.2",
    "jasmine-spec-reporter": "~4.1.0",
    "karma": "~1.7.0",
    "karma-chrome-launcher": "~2.1.1",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "parcel-bundler": "^1.2.0",
    "parcel-plugin-eslint": "^1.0.3",
    "parcel-plugin-typescript": "0.2.0-angular.0",
    "postcss-modules": "^1.1.0",
    "prettier": "1.10.2",
    "protractor": "~5.1.2",
    "ts-node": "~3.2.0",
    "tslint": "~5.7.0",
    "typescript": "~2.4.2"
  }
}