Update Ionic to use scss-linter - ionic-framework

Question

I have an Ionic3 project create over a year ago. How do I get to use the SCSS linter?
This is my package.json
{
"name": "xxx",
"author": "xxx",
"homepage": "xxx",
"private": true,
"scripts": {
"clean": "ionic-app-scripts clean",
"build": "ionic-app-scripts build",
"lint": "ionic-app-scripts lint --bailOnLintError true",
"ionic:build": "ionic-app-scripts build",
"ionic:serve": "ionic-app-scripts serve",
"test": "ng test"
},
"husky": {
"hooks": {
"pre-commit": "npm run lint"
}
},
"dependencies": {
"#angular/animations": "5.1.0",
"#angular/common": "5.1.0",
"#angular/compiler": "5.1.0",
"#angular/compiler-cli": "5.1.0",
"#angular/core": "5.1.0",
"#angular/forms": "5.1.0",
"#angular/http": "5.1.0",
"#angular/platform-browser": "5.1.0",
"#angular/platform-browser-dynamic": "5.1.0",
"#angular/platform-server": "5.1.0",
"#firebase/webchannel-wrapper": "^0.2.5",
"#ionic-native/badge": "4.3.3",
"#ionic-native/camera": "4.3.3",
"#ionic-native/core": "4.3.3",
"#ionic-native/deeplinks": "4.3.3",
"#ionic-native/geolocation": "4.3.3",
"#ionic-native/google-analytics": "4.3.3",
"#ionic-native/launch-navigator": "4.3.3",
"#ionic-native/network": "4.3.3",
"#ionic-native/push": "4.3.3",
"#ionic-native/splash-screen": "4.3.3",
"#ionic-native/status-bar": "4.3.3",
"#types/googlemaps": "3.26.20",
"angular2-moment": "^1.7.0",
"angularfire2": "^5.0.0-rc.5-next",
"cordova-ios": "^4.5.4",
"cordova-plugin-actionsheet": "^2.3.3",
"cordova-plugin-badge": "^0.8.5",
"cordova-plugin-camera": "^3.0.0",
"cordova-plugin-compat": "^1.2.0",
"cordova-plugin-console": "^1.1.0",
"cordova-plugin-device": "^1.1.7",
"cordova-plugin-dialogs": "^1.3.4",
"cordova-plugin-geolocation": "^2.4.3",
"cordova-plugin-google-analytics": "^1.8.3",
"cordova-plugin-ionic-webview": "^1.1.16",
"cordova-plugin-network-information": "^1.3.4",
"cordova-plugin-splashscreen": "^4.1.0",
"cordova-plugin-statusbar": "^2.3.0",
"cordova-plugin-whitelist": "^1.3.3",
"cordova-sqlite-storage": "^2.1.2",
"firebase": "^4.8.0",
"ionic-angular": "^3.9.2",
"ionic-plugin-deeplinks": "^1.0.15",
"ionicons": "3.0.0",
"promise-polyfill": "6.0.2",
"rxjs": "^5.5.5",
"sw-toolbox": "3.6.0",
"uk.co.workingedge.phonegap.plugin.launchnavigator": "^4.1.0",
"zone.js": "^0.8.18"
},
"devDependencies": {
"#angular/cli": "1.6.8",
"#ionic/app-scripts": "^3.1.8",
"#types/jasmine": "^2.8.2",
"#types/node": "^7.0.48",
"codecov": "^2.3.1",
"husky": "^0.15.0-rc.7",
"ionic": "3.19.1",
"jasmine-core": "^2.8.0",
"jasmine-spec-reporter": "^4.2.1",
"karma": "^1.7.1",
"karma-chrome-launcher": "^2.2.0",
"karma-jasmine": "^1.1.1",
"karma-mocha-reporter": "^2.2.5",
"karma-remap-istanbul": "^0.6.0",
"ts-node": "^3.3.0",
"tslint": "^5.9.1",
"tslint-eslint-rules": "^4.0.0",
"typescript": "2.4.2"
},
"cordovaPlugins": [
"cordova-plugin-device",
"cordova-plugin-console",
"cordova-plugin-whitelist",
"cordova-plugin-splashscreen",
"cordova-plugin-statusbar",
"cordova-plugin-network-information",
"ionic-plugin-keyboard"
],
"cordovaPlatforms": [
"ios",
{
"platform": "ios",
"version": "",
"locator": "ios"
}
],
"description": "xxx",
"cordova": {
"platforms": [
"ios"
],
"plugins": {
"cordova-plugin-console": {},
"cordova-plugin-device": {},
"cordova-plugin-geolocation": {
"GEOLOCATION_USAGE_DESCRIPTION": " "
},
"cordova-plugin-network-information": {},
"cordova-plugin-whitelist": {},
"cordova-sqlite-storage": {},
"ionic-plugin-deeplinks": {
"URL_SCHEME": "xxx",
"DEEPLINK_SCHEME": "https",
"DEEPLINK_HOST": "xxx",
"ANDROID_PATH_PREFIX": "/",
"ANDROID_2_PATH_PREFIX": "/",
"ANDROID_3_PATH_PREFIX": "/",
"ANDROID_4_PATH_PREFIX": "/",
"ANDROID_5_PATH_PREFIX": "/",
"DEEPLINK_2_SCHEME": " ",
"DEEPLINK_2_HOST": " ",
"DEEPLINK_3_SCHEME": " ",
"DEEPLINK_3_HOST": " ",
"DEEPLINK_4_SCHEME": " ",
"DEEPLINK_4_HOST": " ",
"DEEPLINK_5_SCHEME": " ",
"DEEPLINK_5_HOST": " "
},
"cordova-plugin-google-analytics": {},
"uk.co.workingedge.phonegap.plugin.launchnavigator": {
"LOCATION_USAGE_DESCRIPTION": "This app requires access to your location for navigation purposes"
},
"cordova-plugin-ionic-webview": {},
"cordova-plugin-camera": {},
"cordova-plugin-splashscreen": {},
"cordova-plugin-badge": {},
"cordova-plugin-statusbar": {}
}
}
}

Answer 1

You should install with :npm i tslint-ionic-rules --save-dev
and than in your tslint.json file add:
{
"extends": "tslint-ionic-rules"
}