Use autoprefixer with angular11

Question

I am using angular11 with SCSS. I have the following class for example:

.freeSpace {
    flex: 1;
    display: flex;
    align-items: flex-end;
    width: 100%;
    max-width: 600px;
}

But, when I do ng build --prod it does not turn to:

.freeSpace {
    -webkit-box-flex: 1;
        -ms-flex: 1;
            flex: 1;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: end;
        -ms-flex-align: end;
            align-items: flex-end;
    width: 100%;
    max-width: 600px;
}

How can I force angular to use autoprefixer?

My angular.json file:

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "we19-app": {
      "projectType": "application",
      "schematics": {
        "@schematics/angular:component": {
          "style": "scss",
          "skipTests": true
        }
      },
      "root": "",
      "sourceRoot": "src",
      "prefix": "app",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "../backend/angular",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.app.json",
            "aot": true,
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "src/styles.scss"
            ],
            "scripts": []
          },
          "configurations": {
            "production": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "namedChunks": false,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "budgets": [
                {
                  "type": "initial",
                  "maximumWarning": "2mb",
                  "maximumError": "5mb"
                },
                {
                  "type": "anyComponentStyle",
                  "maximumWarning": "6kb",
                  "maximumError": "10kb"
                }
              ]
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "we19-app:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "we19-app:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "we19-app:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.spec.json",
            "karmaConfig": "karma.conf.js",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "src/styles.scss"
            ],
            "scripts": []
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "tsconfig.app.json",
              "tsconfig.spec.json",
              "e2e/tsconfig.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        },
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "e2e/protractor.conf.js",
            "devServerTarget": "we19-app:serve"
          },
          "configurations": {
            "production": {
              "devServerTarget": "we19-app:serve:production"
            }
          }
        }
      }
    }
  },
  "defaultProject": "we19-app"
}

I want my final scss files to look like the prefixer. when I open my app in the browser, the "regular" (non-converted to autoprefixer code) scss code is presented.

Also, when I manually attach the following to my scss:

.freeSpace {
    -webkit-box-flex: 1;
        -ms-flex: 1;
            flex: 1;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: end;
        -ms-flex-align: end;
            align-items: flex-end;
    width: 100%;
    max-width: 600px;
}

When I do ng build --prod and view the app in my browser, all these "extra" scss (such as display: -ms-flexbox) are omitted

My .browserslistrc:

# This file is used by the build system to adjust CSS and JS output to support the specified browsers below.
# For additional information regarding the format and rule options, please see:
# https://github.com/browserslist/browserslist#queries

# For the full list of supported browsers by the Angular framework, please see:
# https://angular.io/guide/browser-support

# You can see what browsers were selected by your queries by running:
#   npx browserslist

last 1 Chrome version
last 1 Firefox version
last 2 Edge major versions
last 2 Safari major versions
last 2 iOS major versions
Firefox ESR
not IE 11 # Angular supports IE 11 only as an opt-in. To opt-in, remove the 'not' prefix on this line.

Answer 1

you can modify the .browserslistrc file as follows

Safari 6
IE 10

This results in the following css

.freeSpace {
    -webkit-box-flex: 1;
    -ms-flex: 1;
    flex: 1;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: end;
    -ms-flex-align: end;
    align-items: flex-end;
    width: 100%;
    max-width: 600px;
}

Answer 2

If you check the support page for angular, you will see it only supports recent browser.

So if you build your app it will only add necessary prefixes. If you check for support on flexbox you will see that all current browsers support display: flex . display: -ms-box is only supported by IE10, which is not supported by angular. So it doesn't make sense to bloat your CSS with unnecessary prefixes. That's why it get's filtered out.