How to make Angular 19+, PrimeNG 19+, and Tailwind 4+ work together?

How to make Angular 19+, PrimeNG 19+, and Tailwind 4+ work together?

My configuration:

package.json

{
"name": "web",
"version": "0.0.0",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"watch": "ng build --watch --configuration development",
"test": "ng test"
},
"private": true,
"dependencies": {
"@angular/animations": "^19.1.0",
"@angular/common": "^19.1.0",
"@angular/compiler": "^19.1.0",
"@angular/core": "^19.1.0",
"@angular/forms": "^19.1.0",
"@angular/platform-browser": "^19.1.0",
"@angular/platform-browser-dynamic": "^19.1.0",
"@angular/router": "^19.1.0",
"@primeng/themes": "^19.0.6",
"primeicons": "^7.0.0",
"primeng": "^19.0.9",
"rxjs": "~7.8.0",
"tailwindcss-primeui": "^0.5.1",
"tslib": "^2.3.0",
"zone.js": "~0.15.0"
},
"devDependencies": {
"@angular-devkit/build-angular": "^19.1.4",
"@angular/cli": "^19.1.4",
"@angular/compiler-cli": "^19.1.0",
"@tailwindcss/postcss": "^4.0.9",
"@types/jasmine": "~5.1.0",
"jasmine-core": "~5.5.0",
"karma": "~6.4.0",
"karma-chrome-launcher": "~3.2.0",
"karma-coverage": "~2.2.0",
"karma-jasmine": "~5.1.0",
"karma-jasmine-html-reporter": "~2.1.0",
"postcss": "^8.5.3",
"tailwindcss": "^4.0.9",
"typescript": "~5.7.2"
}
}


angular.json

{
"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
"version": 1,
"newProjectRoot": "projects",
"projects": {
"web": {
"projectType": "application",
"schematics": {},
"root": "",
"sourceRoot": "src",
"prefix": "app",
"architect": {
"build": {
"builder": "@angular-devkit/build-angular:application",
"options": {
"outputPath": "dist/web",
"index": "src/index.html",
"browser": "src/main.ts",
"polyfills": [
"zone.js"
],
"tsConfig": "tsconfig.app.json",
"assets": [
{
"glob": "**/*",
"input": "public"
}
],
"styles": [
"src/styles.scss",
"src/tailwind.css"
],
"scripts": []
},
"configurations": {
"production": {
"budgets": [
{
"type": "initial",
"maximumWarning": "500kB",
"maximumError": "1MB"
},
{
"type": "anyComponentStyle",
"maximumWarning": "4kB",
"maximumError": "8kB"
}
],
"outputHashing": "all"
},
"development": {
"optimization": false,
"extractLicenses": false,
"sourceMap": true
}
},
"defaultConfiguration": "production"
},
"serve": {
"builder": "@angular-devkit/build-angular:dev-server",
"configurations": {
"production": {
"buildTarget": "web:buildroduction"
},
"development": {
"buildTarget": "web:build:development"
}
},
"defaultConfiguration": "development"
},
"extract-i18n": {
"builder": "@angular-devkit/build-angular:extract-i18n"
},
"test": {
"builder": "@angular-devkit/build-angular:karma",
"options": {
"polyfills": [
"zone.js",
"zone.js/testing"
],
"tsConfig": "tsconfig.spec.json",
"assets": [
{
"glob": "**/*",
"input": "public"
}
],
"styles": [
"src/styles.css"
],
"scripts": []
}
}
}
}
},
"schematics": {
"@schematics/angular:component": {
"style": "scss"
}
},
"cli": {
"analytics": "*"
}
}


postcss.config.js

module.exports = {
plugins: {
"@tailwindcss/postcss": {}
},
};


tailwind.config.js

module.exports = {
content: [
"./src/**/*.{html,ts,scss}"
],
theme: {
extend: {},
},
plugins: [
require('tailwindcss-primeui')
]
}


src/style.scss

...


src/tailwind.css

@import "tailwindcss-primeui";

@layer tailwind-base {
@tailwind base;
}

@layer primeng {
}

@layer tailwind-utilities {
@tailwind components;
@tailwind utilities;
}



src/app/app.config.ts

import {ApplicationConfig, provideZoneChangeDetection} from '@angular/core';
import {provideRouter} from '@angular/router';

import {routes} from './app.routes';
import {provideAnimationsAsync} from '@angular/platform-browser/animations/async';
import {providePrimeNG} from 'primeng/config';
import AppPreset from './app.preset';

export const appConfig: ApplicationConfig = {
providers: [
provideZoneChangeDetection({eventCoalescing: true}),
provideRouter(routes),
provideAnimationsAsync(),
providePrimeNG({
theme: {
preset: AppPreset,
options: {
cssLayer: {
name: 'primeng',
order: 'tailwind-base, primeng, tailwind-utilities'
}
}
},
})
]
};


When trying to run, I get an error:

ng serve


Error: It looks like you're trying to use `tailwindcss` directly as a PostCSS plugin. The PostCSS plugin has moved to a separate package, so to continue using Tailwind CSS with PostCSS you'll need to install `@tailwindcss/postcss` and update your PostCSS configuration.


I've tried different configurations, tailwindcss: {}, removing some dependencies, clearing caches, but always the same problem.

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