Support for SCSS output in bezier-tokens (#2568)

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## Self Checklist

- [x] I wrote a PR title in **English** and added an appropriate
**label** to the PR.
- [x] I wrote the commit message in **English** and to follow [**the
Conventional Commits
specification**](https://www.conventionalcommits.org/en/v1.0.0/).
- [x] I [added the
**changeset**](https://github.com/changesets/changesets/blob/main/docs/adding-a-changeset.md)
about the changes that needed to be released. (or didn't have to)
- [x] I wrote or updated **documentation** related to the changes. (or
didn't have to)
- [x] I wrote or updated **tests** related to the changes. (or didn't
have to)
- [x] I tested the changes in various browsers. (or didn't have to)
  - Windows: Chrome, Edge, (Optional) Firefox
  - macOS: Chrome, Edge, Safari, (Optional) Firefox

## Related Issue

<!-- Please link to issue if one exists -->

<!-- Fixes #0000 -->

## Summary

<!-- Please brief explanation of the changes made -->

bezier-tokens에서 scss 파일을 내보냅니다.

## Details

<!-- Please elaborate description of the changes -->

- 일부 유틸 클래스를 만드는 CSS 모듈에서 토큰에 대한 종류를 모두 알고있어야하는 불편함이 있었습니다. 이번에 #2566 PR
작업을 진행하면서 동일한 작업이 반복되는걸 느껴 이를 함께 수정합니다.
- bezier-tokens에서
[map-deep](https://styledictionary.com/reference/hooks/formats/predefined/#scssmap-deep)
포맷으로 scss output을 만들도록 합니다. 자바스크립트 케이스처럼 `index.scss` 를 만드는 과정을 추가했습니다.
- bezier-token의 `sideEffects` 필드에 scss 파일을 추가합니다.
- scss의 `pkg:` Importer 규칙에 따라 bezier-tokens의 conditional export field를
수정했습니다. bezier-react에선 storybook & build 과정 모두 상대 경로로 지정하는 게 잘 동작해서 pkg
프로토콜은 이 PR에서 사용하지 않았습니다 (시간이 좀 더 걸릴듯함)

### Breaking change? (Yes/No)

<!-- If Yes, please describe the impact and migration path for users -->

No

- ev-inner, ev-base 에 대한 유틸 클래스가 추가로 생기지만 사용처 영향은 없습니다 (매우 미미한 스타일 시트 파일
크기 상승)

## References

<!-- Please list any other resources or points the reviewer should be
aware of -->

-
https://sass-lang.com/documentation/js-api/classes/nodepackageimporter/
- https://webpack.kr/guides/tree-shaking/

.changeset/rotten-numbers-explain.md

@@ -0,0 +1,5 @@
+---
+'@channel.io/bezier-tokens': minor
+---
+
+Add SCSS support to access design tokens directly through SCSS variables.

packages/bezier-react/src/styles/components/elevation.module.scss

@@ -1,6 +1,7 @@
-$elevations: 1, 2, 3, 4, 5, 6;
+@use 'sass:map';
+@use '../../../../../node_modules/@channel.io/bezier-tokens/dist/scss' as *;
 
-@each $ev in $elevations {
+@each $ev in map.keys(map.get($tokens, 'light-theme', 'ev')) {
   :where(.elevation-#{$ev}) {
     /* stylelint-disable-next-line bezier/validate-token */
     box-shadow: var(--ev-#{$ev});

packages/bezier-react/src/styles/components/radius.module.scss

@@ -1,17 +1,7 @@
-$radiuses:
-  2,
-  3,
-  4,
-  6,
-  8,
-  12,
-  16,
-  20,
-  32,
-  44,
-  42-p;
+@use 'sass:map';
+@use '../../../../../node_modules/@channel.io/bezier-tokens/dist/scss' as *;
 
-@each $radius in $radiuses {
+@each $radius in map.keys(map.get($tokens, 'global', 'radius')) {
   :where(.radius-#{$radius}) {
     /* stylelint-disable-next-line bezier/validate-token */
     border-radius: var(--radius-#{$radius});

packages/bezier-react/src/styles/components/z-index.module.scss

@@ -1,6 +1,7 @@
-$z-indices: hidden, base, floating, overlay, modal, toast, tooltip, important;
+@use 'sass:map';
+@use '../../../../../node_modules/@channel.io/bezier-tokens/dist/scss' as *;
 
-@each $z-index in $z-indices {
+@each $z-index in map.keys(map.get($tokens, 'global', 'z-index')) {
   :where(.z-index-#{$z-index}) {
     /* stylelint-disable-next-line bezier/validate-token */
     z-index: var(--z-index-#{$z-index});

packages/bezier-tokens/README.md

@@ -10,29 +10,54 @@ npm i -D @channel.io/bezier-tokens
 
 ## Usage
 
-### JavaScript
+### CSS
 
-You can access and use values by token group.
+Provide all design tokens as CSS variables. If you want to apply dark theme tokens, add the `data-bezier-theme="dark"` attribute to the parent element. The default is light theme tokens, which can also be applied by adding the `data-bezier-theme="light"` attribute to the parent element.
 
 ```ts
-import { tokens } from '@channel.io/bezier-tokens'
+import '@channel.io/bezier-tokens/css/styles.css'
+```
 
-console.log(tokens.global.color['blue-300']) // "#..."
-console.log(tokens.lightTheme.color['bg-black-dark']) // "#..."
+```html
+<div data-bezier-theme="light">
+  <div class="foo" />
+  <div data-bezier-theme="dark">
+    <div class="foo" />
+  </div>
+</div>
 ```
 
-### CSS
+```css
+.foo {
+  background-color: var(--bg-black-dark);
+}
+```
 
-Provide all design tokens as CSS variables. If you want to apply dark theme tokens, add the `data-bezier-theme="dark"` attribute to the parent element. The default is light theme tokens, which can also be applied by adding the `data-bezier-theme="light"` attribute to the parent element.
+### SCSS
 
-```ts
-import '@channel.io/bezier-tokens/css/styles.css'
+While CSS variables are recommended, you can also use SCSS variables directly if you need to.
+
+```scss
+@use "sass:map";
+@use "pkg:@channel.io/bezier-tokens" as *;
 
 div {
-  background: var(--bg-black-dark);
+  border-radius: map.get($tokens, "global", "radius", "4"); // ...px
+  background-color: map.get($tokens, "light-theme", "bg", "black", "dark"); // #...
 }
 ```
 
+### JavaScript
+
+You can access and use values by token group.
+
+```ts
+import { tokens } from '@channel.io/bezier-tokens'
+
+console.log(tokens.global.color['blue-300']) // "#..."
+console.log(tokens.lightTheme.color['bg-black-dark']) // "#..."
+```
+
 ## Contributing
 
 See [contribution guide](https://github.com/channel-io/bezier-react/wiki/Contribute).

packages/bezier-tokens/package.json

@@ -19,7 +19,8 @@
       "import": {
         "types": "./dist/types/esm/index.d.mts",
         "default": "./dist/esm/index.mjs"
-      }
+      },
+      "sass": "./dist/scss/index.scss"
     },
     "./alpha": {
       "require": {
@@ -29,10 +30,13 @@
       "import": {
         "types": "./dist/types/alpha/esm/index.d.mts",
         "default": "./dist/alpha/esm/index.mjs"
-      }
+      },
+      "sass": "./dist/alpha/scss/index.scss"
     },
     "./css/*": "./dist/css/*",
-    "./alpha/css/*": "./dist/alpha/css/*"
+    "./scss/*": "./dist/scss/*",
+    "./alpha/css/*": "./dist/alpha/css/*",
+    "./alpha/scss/*": "./dist/alpha/scss/*"
   },
   "typesVersions": {
     "*": {
@@ -42,7 +46,8 @@
     }
   },
   "sideEffects": [
-    "**/*.css"
+    "**/*.css",
+    "**/*.scss"
   ],
   "files": [
     "dist"

packages/bezier-tokens/scripts/build-scss-index.ts

@@ -0,0 +1,35 @@
+import fs from 'fs/promises'
+import path from 'path'
+
+interface BuildScssIndexOptions {
+  buildPath: string
+}
+
+export async function buildScssIndex({ buildPath }: BuildScssIndexOptions) {
+  const destination = path.join(buildPath, 'index.scss')
+
+  try {
+    const files = await fs.readdir(buildPath)
+    let useStatements = ''
+    let mapStatements = '$tokens: (\n'
+
+    for (const file of files.filter(
+      (file) => file.endsWith('.scss') && file !== path.basename(destination)
+    )) {
+      const moduleName = path.basename(file, '.scss')
+
+      useStatements += `@use './${moduleName}' as ${moduleName};\n`
+      mapStatements += `  "${moduleName}": ${moduleName}.$tokens,\n`
+    }
+
+    mapStatements += ');\n'
+
+    const result = `${useStatements}\n${mapStatements}`
+
+    await fs.writeFile(destination, result)
+
+    console.log(`\n✔︎ Created ${destination}`)
+  } catch (error) {
+    throw error
+  }
+}

packages/bezier-tokens/scripts/build-tokens.ts

@@ -6,6 +6,7 @@ import StyleDictionary, {
 } from 'style-dictionary'
 
 import { buildJsIndex } from './build-js-index'
+import { buildScssIndex } from './build-scss-index'
 import {
   alphaCustomCss,
   alphaCustomJsCjs,
@@ -14,6 +15,7 @@ import {
   customJsEsm,
 } from './lib/format'
 import { CSSTransforms } from './lib/transform'
+import { toKebabCase } from './lib/utils'
 import { mergeCss } from './merge-css'
 
 const CustomTransforms = [...Object.values(CSSTransforms)]
@@ -24,6 +26,7 @@ const BUILD_PATH = {
   CJS: 'cjs',
   ESM: 'esm',
   CSS: 'css',
+  SCSS: 'scss',
 }
 
 const TokenBuilder = CustomTransforms.reduce(
@@ -125,6 +128,21 @@ function defineConfig({
         ],
         transforms,
       }),
+      'web/scss': defineWebPlatform({
+        buildPath: `${basePath}/${BUILD_PATH.SCSS}/`,
+        files: [
+          {
+            destination: `${toKebabCase(destination)}.scss`,
+            format: 'scss/map-deep',
+            filter: ({ filePath }) =>
+              source.some((src) => minimatch(filePath, src)),
+            options: {
+              outputReferences: false,
+            },
+          },
+        ],
+        transforms,
+      }),
     },
   }
 }
@@ -209,6 +227,13 @@ async function main() {
     await mergeCss(buildPath)
   }
 
+  for (const buildPath of [
+    `${BUILD_PATH.BASE}/${BUILD_PATH.SCSS}`,
+    `${BUILD_PATH.BASE_ALPHA}/${BUILD_PATH.SCSS}`,
+  ]) {
+    await buildScssIndex({ buildPath })
+  }
+
   for (const options of [
     { buildPath: `${BUILD_PATH.BASE}/${BUILD_PATH.CJS}`, isCjs: true },
     { buildPath: `${BUILD_PATH.BASE_ALPHA}/${BUILD_PATH.CJS}`, isCjs: true },

packages/bezier-tokens/scripts/lib/utils.ts

@@ -6,6 +6,9 @@ export const toCamelCase = (str: string) =>
     .toLowerCase()
     .replace(/[^a-zA-Z0-9]+(.)/g, (_, char) => char.toUpperCase())
 
+export const toKebabCase = (str: string) =>
+  str.replace(/([A-Z])/g, '-$1').toLowerCase()
+
 export const extractNumber = (str: string) =>
   str.match(/-?\d+(\.\d+)?/g)?.join('')