@pandacss/extractor

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Changelog

[0.36.0] - 2024-03-19

Fixed

• Fix Expression produces a union type that is too complex to represent with splitCssProps because of JsxStyleProps type

• Fix merging issue when using a preset that has a token with a conflicting value with another (or the user's config)

import { defineConfig } from '@pandacss/dev'

const userConfig = defineConfig({
  presets: [
    {
      theme: {
        extend: {
          tokens: {
            colors: {
              black: { value: 'black' },
            },
          },
        },
      },
    },
  ],
  theme: {
    tokens: {
      extend: {
        colors: {
          black: {
            0: { value: 'black' },
            10: { value: 'black/10' },
            20: { value: 'black/20' },
            30: { value: 'black/30' },
          },
        },
      },
    },
  },
})

When merged with the preset, the config would create nested tokens (black.10, black.20, black.30) inside of the initially flat black token.

This would cause issues as the token engine stops diving deeper after encountering an object with a value property.

To fix this, we now automatically replace the flat black token using the DEFAULT keyword when resolving the config so that the token engine can continue to dive deeper into the object:

{
  "theme": {
    "tokens": {
      "colors": {
        "black": {
          "0": {
            "value": "black",
          },
          "10": {
            "value": "black/10",
          },
          "20": {
            "value": "black/20",
          },
          "30": {
            "value": "black/30",
          },
-          "value": "black",
+          "DEFAULT": {
+            "value": "black",
+          },
        },
      },
    },
  },
}

• Fix an issue when using a semantic token with one (but not all) condition using the color opacity modifier

import { defineConfig } from '@pandacss/dev'

export default defineConfig({
  theme: {
    extend: {
      tokens: {
        colors: {
          black: { value: 'black' },
          white: { value: 'white' },
        },
      },
      semanticTokens: {
        colors: {
          fg: {
            value: {
              base: '{colors.black/87}',
              _dark: '{colors.white}', // <- this was causing a weird issue
            },
          },
        },
      },
    },
  },
})

• Fix strictPropertyValues typings should allow for CssVars (either predefined from globalVars or any custom CSS variable)

import { defineConfig } from '@pandacss/dev'

export default defineConfig({
  // ...
  strictPropertyValues: true,
  globalVars: {
    extend: {
      '--some-color': 'red',
      '--button-color': {
        syntax: '<color>',
        inherits: false,
        initialValue: 'blue',
      },
    },
  },
})

css({
  // ❌ was not allowed before when `strictPropertyValues` was enabled
  display: 'var(--button-color)', // ✅ will now be allowed/suggested
})

If no globalVars are defined, any var(--*) will be allowed

css({
  // ✅ will be allowed
  display: 'var(--xxx)',
})

Added

• Introduce a new globalVars config option to define type-safe CSS variables and custom CSS @property.

Example:

import { defineConfig } from '@pandacss/dev'

export default defineConfig({
  // ...
  globalVars: {
    '--some-color': 'red',
    '--button-color': {
      syntax: '<color>',
      inherits: false,
      initialValue: 'blue',
    },
  },
})

Note: Keys defined in globalVars will be available as a value for every utilities, as they're not bound to token categories.

import { css } from '../styled-system/css'

const className = css({
  '--button-color': 'colors.red.300',
  // ^^^^^^^^^^^^  will be suggested

  backgroundColor: 'var(--button-color)',
  //                ^^^^^^^^^^^^^^^^^^  will be suggested
})

• Add config.themes to easily define and apply a theme on multiple tokens at once, using data attributes and CSS variables.

Can pre-generate multiple themes with token overrides as static CSS, but also dynamically import and inject a theme stylesheet at runtime (browser or server).

Example:

// panda.config.ts
import { defineConfig } from '@pandacss/dev'

export default defineConfig({
  // ...
  // main theme
  theme: {
    extend: {
      tokens: {
        colors: {
          text: { value: 'blue' },
        },
      },
      semanticTokens: {
        colors: {
          body: {
            value: {
              base: '{colors.blue.600}',
              _osDark: '{colors.blue.400}',
            },
          },
        },
      },
    },
  },
  // alternative theme variants
  themes: {
    primary: {
      tokens: {
        colors: {
          text: { value: 'red' },
        },
      },
      semanticTokens: {
        colors: {
          muted: { value: '{colors.red.200}' },
          body: {
            value: {
              base: '{colors.red.600}',
              _osDark: '{colors.red.400}',
            },
          },
        },
      },
    },
    secondary: {
      tokens: {
        colors: {
          text: { value: 'blue' },
        },
      },
      semanticTokens: {
        colors: {
          muted: { value: '{colors.blue.200}' },
          body: {
            value: {
              base: '{colors.blue.600}',
              _osDark: '{colors.blue.400}',
            },
          },
        },
      },
    },
  },
})

Pregenerating themes

By default, no additional theme variant is generated, you need to specify the specific themes you want to generate in staticCss.themes to include them in the CSS output.

// panda.config.ts
import { defineConfig } from '@pandacss/dev'

export default defineConfig({
  // ...
  staticCss: {
    themes: ['primary', 'secondary'],
  },
})

This will generate the following CSS:

@layer tokens {
  :where(:root, :host) {
    --colors-text: blue;
    --colors-body: var(--colors-blue-600);
  }

  [data-panda-theme='primary'] {
    --colors-text: red;
    --colors-muted: var(--colors-red-200);
    --colors-body: var(--colors-red-600);
  }

  @media (prefers-color-scheme: dark) {
    :where(:root, :host) {
      --colors-body: var(--colors-blue-400);
    }

    [data-panda-theme='primary'] {
      --colors-body: var(--colors-red-400);
    }
  }
}

An alternative way of applying a theme is by using the new styled-system/themes entrypoint where you can import the themes CSS variables and use them in your app.

ℹ️ The styled-system/themes will always contain every themes (tree-shaken if not used), staticCss.themes only applies to the CSS output.

Each theme has a corresponding JSON file with a similar structure:

{
  "name": "primary",
  "id": "panda-themes-primary",
  "dataAttr": "primary",
  "css": "[data-panda-theme=primary] { ... }"
}

ℹ️ Note that for semantic tokens, you need to use inject the theme styles, see below

Dynamically import a theme using its name:

import { getTheme } from '../styled-system/themes'

const theme = await getTheme('red')
//    ^? {
//     name: "red";
//     id: string;
//     css: string;
// }

Inject the theme styles into the DOM:

import { injectTheme } from '../styled-system/themes'

const theme = await getTheme('red')
injectTheme(document.documentElement, theme) // this returns the injected style element

SSR example with NextJS:

// app/layout.tsx
import { Inter } from 'next/font/google'
import { cookies } from 'next/headers'
import { ThemeName, getTheme } from '../../styled-system/themes'

export default async function RootLayout({ children }: { children: React.ReactNode }) {
  const store = cookies()
  const themeName = store.get('theme')?.value as ThemeName
  const theme = themeName && (await getTheme(themeName))

  return (
    <html lang="en" data-panda-theme={themeName ? themeName : undefined}>
      {themeName && (
        <head>
          <style type="text/css" id={theme.id} dangerouslySetInnerHTML={{ __html: theme.css }} />
        </head>
      )}
      <body>{children}</body>
    </html>
  )
}

// app/page.tsx
import { getTheme, injectTheme } from '../../styled-system/themes'

export default function Home() {
  return (
    <>
      <button
        onClick={async () => {
          const current = document.documentElement.dataset.pandaTheme
          const next = current === 'primary' ? 'secondary' : 'primary'
          const theme = await getTheme(next)
          setCookie('theme', next, 7)
          injectTheme(document.documentElement, theme)
        }}
      >
        swap theme
      </button>
    </>
  )
}

// Set a Cookie
function setCookie(cName: string, cValue: any, expDays: number) {
  let date = new Date()
  date.setTime(date.getTime() + expDays * 24 * 60 * 60 * 1000)
  const expires = 'expires=' + date.toUTCString()
  document.cookie = cName + '=' + cValue + '; ' + expires + '; path=/'
}

Finally, you can create a theme contract to ensure that all themes have the same structure:

import { defineThemeContract } from '@pandacss/dev'

const defineTheme = defineThemeContract({
  tokens: {
    colors: {
      red: { value: '' }, // theme implementations must have a red color
    },
  },
})

defineTheme({
  selector: '.theme-secondary',
  tokens: {
    colors: {
      // ^^^^   Property 'red' is missing in type '{}' but required in type '{ red: { value: string; }; }'
      //
      // fixed with
      // red: { value: 'red' },
    },
  },
})

Cbanged

When using strictTokens: true, if you didn't have tokens (or semanticTokens) on a given Token category, you'd still not be able to use any values in properties bound to that category. Now, strictTokens will correctly only restrict properties that have values in their token category.

Example:

// panda.config.ts

export default defineConfig({
  // ...
  strictTokens: true,
  theme: {
    extend: {
      colors: {
        primary: { value: 'blue' },
      },
      // borderWidths: {}, // ⚠️ nothing defined here
    },
  },
})

// app.tsx
css({
  // ❌ before this PR, TS would throw an error as you are supposed to only use Tokens
  // even thought you don't have any `borderWidths` tokens defined !

  // ✅ after this PR, TS will not throw an error anymore as you don't have any `borderWidths` tokens
  // if you add one, this will error again (as it's supposed to)
  borderWidths: '123px',
})

Description

• Simplify typings for the style properties.
• Add the csstype comments for each property.

You will now be able to see a utility or csstype values in 2 clicks !

How

Instead of relying on TS to infer the correct type for each properties, we now just generate the appropriate value for each property based on the config.

This should make it easier to understand the type of each property and might also speed up the TS suggestions as there's less to infer.