Using SASS in Angular 2

Using Sass in angular 2

[Check edited part at end of this answer in case you are using angular cli]

Explaining how to use sass in 'quickstart seed'(https://angular.io/guide/quickstart)
(https://angular.io/guide/setup#download)

Please follow these simple steps:

Step 1: Setup the quickstart seed

Use the below commands to setup

npm install
npm start

you will see 'Hello Angular' on browser.

Step 2: Install node-sass and sass-loader

Use the commands mentioned below to install

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

Now you can see both of these added in your 'dependencies' inside 'package.json' file.

Step 3: Create 2 folders for Sass code and Css code

Create two folders with any name in "quickstart-master" folder. In this case for example:
"sass_folder" and "css_folder". Now create a demo file 'demo.sass' and put it inside 'sass_folder'. You can put a simple sass code in this .sass file. It will look like this:

  $font-stack:    Helvetica, sans-serif
  $primary-color: #000

  body
    font: 100% $font-stack
    color: $primary-color

Step 4: Make changes in 'package.json' file

Add scripts to Build and Watch Sass code present in "sass_folder". After compilation, The resulting css code should be stored in "css_folder". After changes the "Scripts" in 'package.json' file should look like this:

"scripts": {
     "build": "tsc -p src/",
     "build:watch": "tsc -p src/ -w",
     "build:e2e": "tsc -p e2e/",
     "serve": "lite-server -c=bs-config.json",
     "serve:e2e": "lite-server -c=bs-config.e2e.json",
     "prestart": "npm run build",
     "start": "concurrently \"npm run build:watch\" \"npm run serve\" \"npm run watch:sass\"",
     "pree2e": "npm run build:e2e",
     "e2e": "concurrently \"npm run serve:e2e\" \"npm run protractor\" --kill-others --success first",
     "preprotractor": "webdriver-manager update",
     "protractor": "protractor protractor.config.js",
     "pretest": "npm run build",
     "test": "concurrently \"npm run build:watch\" \"karma start karma.conf.js\"",
     "pretest:once": "npm run build",
     "test:once": "karma start karma.conf.js --single-run",
     "lint": "tslint ./src/**/*.ts -t verbose",
     "build:sass": "node-sass sass_folder/ -o css_folder",
     "watch:sass": "npm run build:sass && node-sass sass_folder/ -wo css_folder/"
  }

Have a look at 'start', 'build:sass' and 'watch:sass' only.

Step 5: Run the application

Now you can run the app by using below command:

npm start

You will see the compiled css code in "css_folder" with the same file name 'demo.css'. It will look like this (In this case):

body {
  font: 100% Helvetica, sans-serif;
  color: #000; }

Now if you make any change in .sass file it will be reflected to .css file dynamically as the script is watching the code.

If it shows error, Close the .css file when you make any change in .sass file.

Note: For scss code you can follow the same steps. You just have to put .scss file in "sass_folder" in this case.

[edited]
In case you want to use Angular CLI:

At the time of creation of new Angular project use below mentioned cmnds:

For sass:

ng new Demo_Project --style=sass

For scss:

ng new Demo_Project --style=scss

To change the existing style:

ng set defaults.styleExt scss

After this you can use Cli normally.

Angular 2: Scss won't load in production with webpack

SOLVED:

Just import SCSS files instead of use "styleUrls" into the component.
So it works both in developement and production.

import './auth.component.scss';
import '../common/common.scss';

@Component({
  selector: 'tep-auth',
  templateUrl: './auth.component.html'
  providers: []
})

Remarks:

1) In production i created a bundle of Css (see Webpack config)

2) It's necessary to import the bundle into the views as we do with normal css file.

How to add to import SCSS files in Angular 2

1 You create a global styles.scss file under src directory.

2 Next you add that file to angular-cli.json styles array:

 "apps": [
        {
            "root": "src",
            "outDir": "dist",
            "assets": "assets",
            "index": "index.html",
            "main": "main.ts",
            "test": "test.ts",
            "tsconfig": "tsconfig.json",
            "prefix": "app",
            "mobile": false,
            "styles": [
                "styles.css"
            ],
            "scripts": [],
            "environments": {
                "source": "environments/environment.ts",
                "dev": "environments/environment.ts",
                "prod": "environments/environment.prod.ts"
            }
        }
    ],

3 Import all of your .scss files in styles.scss

@import 'styles/colors.scss';

How to use sass-loader in Angular?

Import .scss file into other .scss files

You can specify the .scss inside other .scss files using the relative path of your file inside the assets path.

Your default assets path should be

"assets": [
              "src/favicon.ico",
              "src/assets"
            ]

which is defined in the angular.json file.

Example:

• You have an app.component.scss
• Your theme.scss file is in ./src/assets/theme/theme.scss

Then you would import it inside app.component.scss like:

@import '../assets/theme/theme.scss';

Specify the style preprocessor option to shorten the import

If you want to shorten the path like you described, you just add the path to the stylePreprocessorOptions in the angular.json file:

"architect": {
        "build": {
          ...
          "options": {
            ...
            "stylePreprocessorOptions": {
              "includePaths": [
                "./src/assets/style/theme"
              ]
            },
         },
         "test": {
           ...
           "options": {
             ...
             "stylePreprocessorOptions": {
               "includePaths": [
                 "./src/assets/style/theme"
               ]
             }
           }
         }
}

Then you should be able to include your file like @import 'theme.scss';

• For more insights read this: https://github.com/angular/angular-cli/wiki/stories-global-styles
• Official documentation: https://angular.io/guide/workspace-config
• Source that I used: How to short path to file in Angular?

Update after description changed

I suppose you set the wrong relative path. Therefore you need to set the stylePreprocessorOptions like that:

"includePaths": ["./src/lib"]

in build and test

After you set this, you can put in any theme file there and like:

./src/lib/theme.scss and import it like @import 'theme.scss';

Using SCSS with angular library created using angular-cli

Till the date (10-Jan-2019, there is no direct support for global scss in the library even though this is a very common scenario.

From this discussion, I got the workaround that I need to bundle it myself. So I used scss-bundle to create one big scss file. You can add it using

yarn add scss-bundle@next -D

and then the script to bundle and run in watch mode

"build-lib-watch-styles": "scss-bundle -e \"./projects/lib-name/src/lib/styles/lib-name.scss\" -d \"./dist-lib/lib-name/styles/lib-name.scss\" -w \"./projects/lib-name/src/lib/styles\"",

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