I was exhausted to figure out the ng build --configuration production issue over the weekend. It worked with ng serve command but not ng build which made web page responsive didn't work, as (presuming) @angular-devkit/build-angular": "~12.2.8") failed to handle bootstrap css during ng build process.

To reproduce this issue, you can simply to run ng new my-app to generate a very simple Angular 12 app, and then install ng-uikit-pro-standard.git#12.0.0 with npm install command, Once you got ng-uikit-pro-standard.git#12.0.0 installed, follow the official installation doc to load MDBBootstrapModulesPro in app.modules.ts, then you can run ng build --configuration production to build this simple app. Finally, use http-server to start you built app in your dist/ folder, then you can notice the responsive doesn't work.

My workaround for now is to downgrade Angular to 11.2.14 and downgrade ng-uikit-pro-standard.git to 11.1.0 and using "@angular-devkit/build-angular": "0.1102.14" for building.

Below is my package.json file.

{
  "name": "my-awesome-guest",
  "version": "11.2.14",
  "scripts": {
    "ng": "ng",
    "start": "node version.ts && ng serve",
    "build": "node version.ts && ng build --configuration=production",
    "build-canary": "node version.ts && ng build --prod --configuration=canary",
    "test": "ng test --watch false",
    "lint": "ng lint",
    "build:all": "node version.ts && ng build --prod && ng run my-awesome-guest:server && npm run webpack:prerender && npm run prerender",
    "serve:prerender": "http-server dist -c-1",
    "webpack:prerender": "webpack --config webpack.prerender.config.js",
    "prerender": "node dist/prerender.js",
    "replace-endpoint-version": "node replace-endpoint-service-version.js",
    "make-link-dispatch-yaml": "node make-link-dispatch-yaml.js"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^11.2.14",
    "@angular/cdk": "^11.2.13",
    "@angular/common": "^11.2.14",
    "@angular/compiler": "^11.2.14",
    "@angular/core": "^11.2.14",
    "@angular/fire": "^6.1.5",
    "@angular/forms": "^11.2.14",
    "@angular/platform-browser": "^11.2.14",
    "@angular/platform-browser-dynamic": "^11.2.14",
    "@angular/platform-server": "^11.2.14",
    "@angular/pwa": "0.1102.14",
    "@angular/router": "^11.2.14",
    "@angular/service-worker": "^11.2.14",
    "@fortawesome/fontawesome-free": "^5.15.4",
    "@types/chart.js": "^2.9.34",
    "@types/jquery": "^3.5.6",
    "@types/lodash": "^4.14.175",
    "@types/moment": "^2.13.0",
    "angular-calendar": "^0.28.28",
    "animate.css": "^4.1.1",
    "chart.js": "^2.5.0",
    "core-js": "^3.18.1",
    "create-symlink": "^1.0.0",
    "del": "6.0.x",
    "delete": "^1.1.0",
    "easy-pie-chart": "^2.1.7",
    "firebase": "^8.10.0",
    "font-awesome": "4.7.x",
    "fs-extra": "^10.0.0",
    "git-describe": "^4.1.0",
    "git-rev-sync": "^3.0.1",
    "hammerjs": "^2.0.8",
    "jarallax": "^1.12.7",
    "jquery": "^3.6.0",
    "lodash": "^4.17.21",
    "mini-css-extract-plugin": "^2.3.0",
    "moment": "^2.29.1",
    "moment-timezone": "^0.5.33",
    "ng-html-util": "3.0.x",
    "ng-uikit-pro-standard": "git+https://oauth2:[YOUR_PRO_ACCESS_TOKEN]@git.mdbootstrap.com/mdb/angular/ng-uikit-pro-standard.git#11.1.0",
    "ngx-device-detector": "^2.1.1",
    "replace-in-file": "^6.2.0",
    "rxjs": "^6.6.0",
    "rxjs-compat": "^6.6.0",
    "screenfull": "^3.3.0",
    "web-animations-js": "2.3.x",
    "zone.js": "^0.11.4"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "0.1102.14",
    "@angular/cli": "~11.2.14",
    "@angular/compiler-cli": "^11.2.14",
    "@types/chance": "^1.1.3",
    "@types/jasmine": "~3.8.0",
    "@types/node": "~16.10.2",
    "chance": "^1.1.8",
    "concat": "^1.0.3",
    "firebase-tools": "^8.10.0",
    "fs-extra": "^10.0.0",
    "jasmine-core": "~3.8.0",
    "karma": "~6.3.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage": "~2.0.3",
    "karma-jasmine": "~4.0.0",
    "karma-jasmine-html-reporter": "~1.7.0",
    "ts-loader": "^9.2.6",
    "ts-node": "~10.2.1",
    "tslint": "~6.1.3",
    "typescript": "~4.1.6",
    "ws": "^8.2.2"
  }
}