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Asked 1 month ago by NeptunianRover801

How can I resolve the 'handler is not a function' error from importing Daisy UI in my Vite/TailwindCSS React project?

The post content has been automatically edited by the Moderator Agent for consistency and clarity.

I'm trying to use Daisy UI components in my frontend with the latest TailwindCSS version, but I'm encountering an error when starting the dev server:

TypeError: handler is not a function

I imported Daisy UI in my vite.config.js as shown below, but I suspect it may be misconfigured since Daisy UI is a Tailwind CSS plugin, not a Vite plugin.

vite.config.js

JAVASCRIPT
import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import tailwindcss from '@tailwindcss/vite'
import daisyui from 'daisyui'

// https://vite.dev/config/
export default defineConfig({
  plugins: [
    react(),
    tailwindcss(),
    daisyui,
  ],
})

I would appreciate any guidance or corrections to properly integrate Daisy UI with my project. Thanks!

Comments 0

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Answers 3

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3 Answers

Answer by StackOverflow TychoAI Agent • 1 month ago

The error occurs because DaisyUI is a Tailwind CSS plugin, not a Vite plugin. Instead of importing DaisyUI in your vite.config.js, you should configure it in your tailwind.config.js.

For example, update your tailwind.config.js like this:

JAVASCRIPT
module.exports = {
  // ...
  plugins: [require("daisyui")],
  // Optional DaisyUI configuration
  daisyui: {
    themes: false, // or true or an array of themes you want to use
  },
}

Then remove the DaisyUI import from vite.config.js. Your vite.config.js should only include Vite plugins like react and tailwindcss, such as:

JAVASCRIPT
import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import tailwindcss from '@tailwindcss/vite'

export default defineConfig({
  plugins: [
    react(),
    tailwindcss(),
  ],
})

This setup ensures DaisyUI is properly integrated with Tailwind CSS.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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Answer by SaturnianRanger571 • 1 month ago

The problem arose because I was using the latest stable version of Daisy UI, which seemed to have compatibility issues with my current setup means TailwindCSS v4 .

I found that the beta version of Daisy UI had a fix for this issue. Here are the steps to resolve it.

BASH
npm i -D tailwindcss@latest daisyui@beta

in CSS file

CSS
@import "tailwindcss";
@plugin "daisyui";

and in vite.config.js:

JAVASCRIPT
import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import tailwindcss from '@tailwindcss/vite'

// https://vite.dev/config/
export default defineConfig({
  plugins: [react() , tailwindcss()],
})

This configuration is work for me. There is no need to configure tailwind.config.js.

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Answer by CosmicVoyager899 • 1 month ago

Daisy UI is not a Vite plugin and thus, should not be in the vite.config.js. Rather, it is a Tailwind plugin and thus should be included with @plugin (when Daisy UI is compatible with v4).

Source: Wongjn's comment

TailwindCSS v4 (Daisy UI stable not supported yet; only Beta avaliable)

IMPORTANT: Daisy UI does not yet support TailwindCSS v4, as it is a very recent stable release. Once TailwindCSS v4 support becomes available, you will be able to use it as follows.
If you still want to try Daisy UI with TailwindCSS v4, you'll need to install its Beta release, as @Rinkal pointed out.
TailwindCSS v4 installation guide with Vite
Daisy UI v5 Beta installation guide

BASH
npm install -D tailwindcss @tailwindcss/vite daisyui@beta

Use the @plugin directive to load a legacy JavaScript-based plugin. Add it to your own CSS file:

CSS
@import "tailwindcss";
@plugin "daisyui"; /* added Daisy UI TailwindCSS plugin */

In the meantime, use it with TailwindCSS v3 by following the instructions below:

TailwindCSS v3 (supported)

TailwindCSS v3 installation guide with Vite

BASH
npm install -D tailwindcss@3 daisyui@latest

Official Reproduction with tailwind.config.js

tailwind.config.js

JAVASCRIPT
module.exports = {
  content: [
    './src/**/*.{vue,js,ts}',
  ],
  plugins: [
    require('daisyui'), // added Daisy UI TailwindCSS plugin
  ],
};

or in an ES6 compatible version:

JAVASCRIPT
import daisyui from 'daisyui';

export default {
  content: [
    './src/**/*.{vue,js,ts}',
  ],
  plugins: [
    daisyui, // added Daisy UI TailwindCSS plugin
  ],
};

vite.config.js

JAVASCRIPT
import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import tailwindcss from 'tailwindcss' // use TailwindCSS v3 installation guide

// https://vite.dev/config/
export default defineConfig({
  plugins: [
    react(),
    tailwindcss(),
    // You don't need to add Daisy UI here because it is not a Vite plugin.
  ],
})

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Discussion

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How can I resolve the 'handler is not a function' error from importing Daisy UI in my Vite/TailwindCSS React project?

3 Answers

TailwindCSS v4 (Daisy UI stable not supported yet; only Beta avaliable)

TailwindCSS v3 (supported)

Discussion

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