Overview

Frequently Asked Questions

Here's a list of frequently asked questions (FAQ) and how to resolve common issues in Panda.

How does Panda manage style conflicts ?

When you combine shorthand and longhand properties, Panda will resolve the styles in a predictable way. The shorthand property will take precedence over the longhand property.

import { css } from '../styled-system/css'
 
const styles = css({
  paddingTop: '20px'
  padding: "10px",
})

The styles generated at build time will look like this:

@layer utilities {
  .p_10px {
    padding: 10px;
  }
 
  .pt_20px {
    padding-top: 20px;
  }
}

How to get Panda to work with Jest?

If you run into error messages like SyntaxError: Unexpected token 'export' when running Jest tests. Here's what you can:

In your tsconfig, add

{
  "compilerOptions": {
    "allowJs": true
  }
}

In your Jest configuration, add the ts-jest transformer:

export default {
  // ...
  transform: {
    '^.+\\.tsx?$': 'ts-jest',
    '^.+\\.(ts|tsx|js|jsx)?$': 'ts-jest'
  }
}

In your Panda config, set the outExtension to js:

export default defineConfig({
  // ...
  outExtension: 'js'
})

HMR does not work when I use tsconfig paths?

Panda tries to automatically infer and read the custom paths defined in tsconfig.json file. However, there might be scenarios where the hot module replacement doesn't work.

To fix this add the importMap option to your panda.config.js file, setting it's value to the specified paths in your tsconfig.json file.

// tsconfig.json
 
{
  "compilerOptions": {
    "baseUrl": "./src",
    "paths": {
      "@my-path/*": ["./styled-system/*"]
    }
  }
}
// panda.config.js
 
module.exports = {
  importMap: '@my-path'
}

This will ensure that the paths are resolved correctly, and HMR works as expected.

HMR not triggered

If you are having issues with HMR not being triggered after a panda.config.ts change (or one of its dependencies), you can manually specify the files that should trigger a rebuild by adding the following to your panda.config.ts:

import { defineConfig } from '@pandacss/dev'
 
export default defineConfig({
  // ...
  dependencies: ['path/to/files/**.ts']
})

Why are my styles not applied?

Check that the @layer rules are set and the corresponding .css file is included. If you're not using postcss, ensure that styled-system/styles.css is imported and that the panda command has been run (or is running with --watch).

How can I debug the styles?

You can use the panda debug to debug design token extraction & css generated from files.

If the issue persists, you can try looking for it in the issues (opens in a new tab) or in the discord (opens in a new tab). If you can't find it, please create a minimal reproduction and submit a new github issue (opens in a new tab) so we can help you.

Why is my IDE not showing styled-system imports?

If you're not getting import autocomplete in your IDE, you may need to include the styled-system directory in your tsconfig.json file.

How do I get a type with each recipe properties?

You can get a config recipe properties types by using XXXVariantProps. Let's say you have a config recipe named button, you can import its type like this:

import { button, type ButtonVariantProps } from '../styled-system/recipes'

You can get an atomic recipe properties types by using RecipeVariantProps. Let's say you have a atomic recipe named button, you can get its type like this:

import { cva, type RecipeVariantProps } from '../styled-system/css'
 
export type ButtonVariantProps = RecipeVariantProps<typeof buttonStyle>

How do I split recipe props from the rest?

You can split recipe props by using xxx.splitVariantProps. Let's say you have a recipe named button, you can split its props like this:

import { css, cx } from '../styled-system/css'
import { ButtonVariantProps, button } from '../styled-system/recipes'
 
interface ButtonProps extends ButtonVariantProps {
  children: React.ReactNode
}
 
export function Button(props: ButtonProps) {
  const { children, ...rest } = props
  const [buttonProps, cssProps] = button.splitVariantProps(rest)
  return (
    <button className={cx(button(buttonProps), css(cssProps))}>
      {children}
    </button>
  )
}

The same xxx.splitVariantProps method is available for both config recipes and atomic recipes.

How do I reference a token value or css var?

You can reference a token value or it's associated css variable using the token function. This function allows you to access and use the values stored in your theme tokens at runtime.

import { token } from '../styled-system/tokens'
 
function App() {
  return (
    <div
      style={{
        background: token('colors.blue.200')
      }}
    />
  )
}

Should I commit the styled-system folder?

Just like the node_modules folder, you most likely don't want to commit the styled-system folder. It contains code that is auto-generated and can be re-generated at any time.

How does Panda work?

When running pnpm panda, here's what's happening under the hood:

  • Load Panda context:
    • Find and evaluate app config, merge result with presets.
    • Create panda context: prepare code generator from config, parse user's file as AST.
  • Generating artifacts:
    • Write lightweight JS runtime and types to output directory
  • Extracting used styles in app code:
    • Run parser on each user's file: identify and extract styles, compute CSS, write to styles.css.

I'm seeing a "Could not resolve xxx" error with esbuild/tsup. What should I do?

In such a case, check the outExtension in your panda.config and set it to "js". This will ensure your modules are resolved correctly.

Why does importing styled not exist?

You should use config.jsxFramework when you need to import styled components. You can then use the jsxFactory option to set the name of the factory component.

Why is my preset overriding the base one, even after adding it to the array?

You might have forgotten to include the extend keyword in your config. Without extend, your preset will completely replace the base one, instead of merging with it.

Why is my base condition not working in this example?

css({ color: { _base: 'red.600', _dark: 'white' } })

You used _base instead of base, there is no underscore _.

What's the difference between using defineConfig() vs definePreset()

defineConfig is intended to be used in your app config, and will show you all the config keys that are available. definePreset will only show you the config keys that will be merged into an app's config, the rest will be ignored.

How can I completely override the default tokens?.

If you want to completely override all of the default presets theme tokens, you can omit the extends keyword from your theme config object.

If you want to keep some of the defaults, you can install the @pandacss/preset-panda package, import it, then specifically pick what you need in there (or use the JS spread operator ... and override the other keys).

How do I make a design system / component library with Panda?

There is a detailed guide on how to do this here.

Can I use dynamic styles with Panda?

Yes, you can use dynamic styles with Panda. More on that here.

Should I use atomic or config recipes ?

Config recipes are generated just in time, meaning that only the recipes and variants you use will exist in the generated CSS, regardless of the number of recipes in the config.

This contrasts with Atomic recipes (cva), which generates all of the variants regardless of what was used in your code. The reason for this difference is that all config.recipes are known at the start of the panda process when we evaluate your config. In contrast, the CVA recipes are scattered throughout your code. To get all of them and find their usage across your code, we would need to scan your app code multiple times, which would not be ideal performance-wise.

When dealing with simple use cases, or if you need code colocation, or even avoiding dynamic styling, atomic recipes shine by providing all style variants. Config recipes are preferred for design system components, delivering leaner CSS with only the styles used. Choose according to your component needs.

Why does the panda codegen command fail ?

If you run into any error related to "Transforming const to the configured target environment ("es5") is not supported yet", update your tsconfig to use es6 or higher:

{
  "compilerOptions": {
    "target": "es6"
  }
}

How can I generate all possible CSS variants at build time?

While it's possible to generate all variants, even unused ones, by using config.staticCss (opens in a new tab), it's generally not recommended to use it for more than a few values. However, keep in mind this approach compromises one of Panda's strengths: lean, usage-based CSS generation.

Can I use one-off media query and other at rules?

Yes, you can! You can apply one-off media queries and other at rules (such as @container, @supports) in your CSS as shown below:

css({
  containerType: 'size',
  '@media (min-width: 10px)': {
    fontSize: 'xl',
    color: 'blue.300'
  },
  '@container (min-width: 10px)': {
    fontSize: '2xl',
    color: 'green.300'
  },
  '@supports (display: flex)': {
    fontSize: '3xl',
    color: 'red.300'
  }
})

How can I prevent other libraries from overriding my styles?

You can use Layer Imports (opens in a new tab) to prevent other libraries from overriding your styles.

First of all you cast the css from the other library(s) to a css layer:

@import url('bootstrap.css') layer(bootstrap);
 
@import url('ionic.css') layer(ionic);

Then update the default layer list to deprioritize the styles from the other library(s):

@layer bootstrap, reset, base, token, recipes, utilities;
 
@layer ionic, reset, base, token, recipes, utilities;
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