feat: make postcssIsolateStyles idempotent

BREAKING CHANGE: `includeFiles` option in `postcssIsolateStyles` now defaults to `[/vp-doc\.css/, /base\.css/]` You can remove explicit `includeFiles` if you were using it just to run it on `vp-doc.css`. To revert back to older behavior pass `includeFiles: [/base\.css/]`. The underlying implementation is changed and `transform` and `exclude` options are no longer supported. Use `postcss-prefix-selector` directly if you've advanced use cases.

__tests__/unit/node/postcss/isolateStyles.test.ts

@@ -1,43 +1,26 @@
-import {
-  postcssIsolateStyles,
-  splitSelectorPseudo
-} from 'node/postcss/isolateStyles'
+import { postcssIsolateStyles } from 'node/postcss/isolateStyles'
+import postcss from 'postcss'
 
-// helper to run plugin transform on selector
-function apply(
-  prefixPlugin: ReturnType<typeof postcssIsolateStyles>,
-  selector: string
-) {
-  // `prepare` is available on the runtime plugin but missing from the types, thus cast to `any`
-  const { Rule } = (prefixPlugin as any).prepare({
-    root: { source: { input: { file: 'foo/base.css' } } }
-  })
-  const rule = { selectors: [selector] }
-  Rule(rule, { result: {} })
-  return rule.selectors[0]
+function apply(selector: string) {
+  const { root } = postcss([postcssIsolateStyles()]).process(`${selector} {}`)
+  return (root.nodes[0] as any).selector
 }
 
 describe('node/postcss/isolateStyles', () => {
-  const plugin = postcssIsolateStyles()
-
   test('splitSelectorPseudo skips escaped colon', () => {
-    const input = '.foo\\:bar'
-    const [selector, pseudo] = splitSelectorPseudo(input)
-    expect(selector).toBe(input)
-    expect(pseudo).toBe('')
+    expect(apply('.foo\\:bar')).toBe(
+      '.foo\\:bar:not(:where(.vp-raw, .vp-raw *))'
+    )
   })
 
   test('splitSelectorPseudo splits on pseudo selectors', () => {
-    const input = '.button:hover'
-    const [selector, pseudo] = splitSelectorPseudo(input)
-    expect(selector).toBe('.button')
-    expect(pseudo).toBe(':hover')
+    expect(apply('.button:hover')).toBe(
+      '.button:not(:where(.vp-raw, .vp-raw *)):hover'
+    )
   })
 
-  it('postcssIsolateStyles inserts :not(...) in the right place', () => {
-    const input = '.disabled\\:opacity-50:disabled'
-    const result = apply(plugin, input)
-    expect(result).toBe(
+  test('postcssIsolateStyles inserts :not(...) in the right place', () => {
+    expect(apply('.disabled\\:opacity-50:disabled')).toBe(
       '.disabled\\:opacity-50:not(:where(.vp-raw, .vp-raw *)):disabled'
     )
   })

docs/en/guide/markdown.md

@@ -277,11 +277,11 @@ Wraps in a `<div class="vp-raw">`
   }
   ```
 
-  It uses [`postcss-prefix-selector`](https://github.com/RadValentin/postcss-prefix-selector) under the hood. You can pass its options like this:
+  You can pass its options like this:
 
   ```js
   postcssIsolateStyles({
-    includeFiles: [/vp-doc\.css/] // defaults to /base\.css/
+    includeFiles: [/custom\.css/] // defaults to [/vp-doc\.css/, /base\.css/]
   })
   ```
 

docs/es/guide/markdown.md

@@ -256,11 +256,11 @@ La clase `vp-raw` también puede ser usada directamente en elementos. El aislami
   }
   ```
 
-  El utiliza [`postcss-prefix-selector`](https://github.com/RadValentin/postcss-prefix-selector) internamente. Puede pasar opciones así:
+  Puede pasar opciones así:
 
   ```js
   postcssIsolateStyles({
-    includeFiles: [/vp-doc\.css/] // o padrão é /base\.css/
+    includeFiles: [/custom\.css/] // o padrão é [/vp-doc\.css/, /base\.css/]
   })
   ```
 

docs/fa/guide/markdown.md

@@ -255,11 +255,11 @@ export default defineConfig({
   }
   ```
 
-  این از [`postcss-prefix-selector`](https://github.com/RadValentin/postcss-prefix-selector) استفاده می‌کند. می‌توانید گزینه‌های آن را به این صورت پاس بدهید:
+  می‌توانید گزینه‌های آن را به این صورت پاس بدهید:
 
   ```js
   postcssIsolateStyles({
-    includeFiles: [/vp-doc\.css/] // به طور پیش‌فرض /base\.css/
+    includeFiles: [/custom\.css/] // به طور پیش‌فرض [/vp-doc\.css/, /base\.css/]
   })
   ```
 

docs/ko/guide/markdown.md

@@ -255,11 +255,11 @@ export default defineConfig({
   }
   ```
 
-  이것은 기본적으로 [`postcss-prefix-selector`](https://github.com/RadValentin/postcss-prefix-selector)를 사용합니다. 다음과 같이 옵션을 전달할 수 있습니다:
+  다음과 같이 옵션을 전달할 수 있습니다:
 
   ```js
   postcssIsolateStyles({
-    includeFiles: [/vp-doc\.css/] // 기본값은 /base\.css/
+    includeFiles: [/custom\.css/] // 기본값은 [/vp-doc\.css/, /base\.css/]
   })
   ```
 

docs/package.json

@@ -15,7 +15,7 @@
     "open-cli": "^8.0.0",
     "postcss-rtlcss": "^5.7.1",
     "vitepress": "workspace:*",
-    "vitepress-plugin-group-icons": "^1.6.2",
-    "vitepress-plugin-llms": "^1.7.2"
+    "vitepress-plugin-group-icons": "^1.6.3",
+    "vitepress-plugin-llms": "^1.7.3"
   }
 }

docs/pt/guide/markdown.md

@@ -255,11 +255,11 @@ A classe `vp-raw` também pode ser usada diretamente em elementos. O isolamento
   }
   ```
 
-  Ele utiliza [`postcss-prefix-selector`](https://github.com/RadValentin/postcss-prefix-selector) internamente. Você pode passar opções assim:
+  Você pode passar opções assim:
 
   ```js
   postcssIsolateStyles({
-    includeFiles: [/vp-doc\.css/] // o padrão é /base\.css/
+    includeFiles: [/custom\.css/] // o padrão é [/vp-doc\.css/, /base\.css/]
   })
   ```
 

docs/ru/guide/markdown.md

@@ -281,11 +281,11 @@ console.log('Привет, VitePress!')
   }
   ```
 
-  Он использует [`postcss-prefix-selector`](https://github.com/RadValentin/postcss-prefix-selector) под капотом. Вы можете передать ему параметры следующим образом:
+  Вы можете передать ему параметры следующим образом:
 
   ```js
   postcssIsolateStyles({
-    includeFiles: [/vp-doc\.css/] // по умолчанию /base\.css/
+    includeFiles: [/custom\.css/] // по умолчанию [/vp-doc\.css/, /base\.css/]
   })
   ```
 

docs/zh/guide/markdown.md

@@ -255,11 +255,11 @@ Wraps in a `<div class="vp-raw">`
   }
   ```
 
-  它在底层使用 [`postcss-prefix-selector`](https://github.com/RadValentin/postcss-prefix-selector)。你可以像这样传递它的选项：
+  你可以像这样传递它的选项：
 
   ```js
   postcssIsolateStyles({
-    includeFiles: [/vp-doc\.css/] // 默认为 /base\.css/
+    includeFiles: [/custom\.css/] // 默认为 [/vp-doc\.css/, /base\.css/]
   })
   ```
 

package.json

@@ -111,19 +111,19 @@
     "mark.js": "8.11.1",
     "minisearch": "^7.1.2",
     "shiki": "^3.9.2",
-    "vite": "^7.1.1",
+    "vite": "^7.1.2",
     "vue": "^3.5.18"
   },
   "devDependencies": {
-    "@clack/prompts": "^1.0.0-alpha.1",
-    "@iconify/utils": "^3.0.0",
-    "@mdit-vue/plugin-component": "^3.0.0",
-    "@mdit-vue/plugin-frontmatter": "^3.0.0",
-    "@mdit-vue/plugin-headers": "^3.0.0",
-    "@mdit-vue/plugin-sfc": "^3.0.0",
-    "@mdit-vue/plugin-title": "^3.0.0",
-    "@mdit-vue/plugin-toc": "^3.0.0",
-    "@mdit-vue/shared": "^3.0.0",
+    "@clack/prompts": "^1.0.0-alpha.3",
+    "@iconify/utils": "^3.0.1",
+    "@mdit-vue/plugin-component": "^3.0.2",
+    "@mdit-vue/plugin-frontmatter": "^3.0.2",
+    "@mdit-vue/plugin-headers": "^3.0.2",
+    "@mdit-vue/plugin-sfc": "^3.0.2",
+    "@mdit-vue/plugin-title": "^3.0.2",
+    "@mdit-vue/plugin-toc": "^3.0.2",
+    "@mdit-vue/shared": "^3.0.2",
     "@polka/compression": "^1.0.0-next.28",
     "@rollup/plugin-alias": "^5.1.1",
     "@rollup/plugin-commonjs": "^28.0.6",
@@ -141,13 +141,12 @@
     "@types/minimist": "^1.2.5",
     "@types/node": "^24.2.1",
     "@types/picomatch": "^4.0.2",
-    "@types/postcss-prefix-selector": "^1.16.3",
     "@types/prompts": "^2.4.9",
     "chokidar": "^4.0.3",
     "conventional-changelog-cli": "^5.0.0",
     "cross-spawn": "^7.0.6",
     "debug": "^4.4.1",
-    "esbuild": "^0.25.8",
+    "esbuild": "^0.25.9",
     "execa": "^9.6.0",
     "fs-extra": "^11.3.1",
     "get-port": "^7.1.0",
@@ -165,7 +164,7 @@
     "minimist": "^1.2.8",
     "nanoid": "^5.1.5",
     "ora": "^8.2.0",
-    "oxc-minify": "^0.81.0",
+    "oxc-minify": "^0.82.1",
     "p-map": "^7.0.3",
     "package-directory": "^8.1.0",
     "path-to-regexp": "^6.3.0",
@@ -174,7 +173,7 @@
     "playwright-chromium": "^1.54.2",
     "polka": "^1.0.0-next.28",
     "postcss": "^8.5.6",
-    "postcss-prefix-selector": "^2.1.1",
+    "postcss-selector-parser": "^7.1.0",
     "prettier": "^3.6.2",
     "prompts": "^2.4.2",
     "punycode": "^2.3.1",
@@ -194,7 +193,7 @@
   },
   "peerDependencies": {
     "markdown-it-mathjax3": "^4",
-    "oxc-minify": "^0.81.0",
+    "oxc-minify": "^0.82.1",
     "postcss": "^8"
   },
   "peerDependenciesMeta": {

src/node/postcss/isolateStyles.ts

@@ -1,21 +1,38 @@
-import postcssPrefixSelector from 'postcss-prefix-selector'
+import type { Plugin } from 'postcss'
+import selectorParser from 'postcss-selector-parser'
 
-export function postcssIsolateStyles(
-  options: Parameters<typeof postcssPrefixSelector>[0] = {}
-): ReturnType<typeof postcssPrefixSelector> {
-  return postcssPrefixSelector({
-    prefix: ':not(:where(.vp-raw, .vp-raw *))',
-    includeFiles: [/base\.css/],
-    transform(prefix, _selector) {
-      // split selector from its pseudo part if the trailing colon is not escaped
-      const [selector, pseudo] = splitSelectorPseudo(_selector)
-      return selector + prefix + pseudo
-    },
-    ...options
-  })
+type Options = {
+  includeFiles?: RegExp[]
+  ignoreFiles?: RegExp[]
+  prefix?: string
 }
 
-export function splitSelectorPseudo(selector: string): [string, string] {
-  const [base, pseudo = ''] = selector.split(/(?<!\\)(:\S*)$/)
-  return [base, pseudo]
+export function postcssIsolateStyles({
+  includeFiles = [/vp-doc\.css/, /base\.css/],
+  ignoreFiles,
+  prefix = ':not(:where(.vp-raw, .vp-raw *))'
+}: Options = {}): Plugin {
+  const prefixNodes = selectorParser().astSync(prefix).first.nodes
+
+  return /* prettier-ignore */ {
+    postcssPlugin: 'postcss-isolate-styles',
+    Once(root) {
+      const file = root.source?.input.file
+      if (file && includeFiles?.length && !includeFiles.some((re) => re.test(file))) return
+      if (file && ignoreFiles?.length && ignoreFiles.some((re) => re.test(file))) return
+
+      root.walkRules((rule) => {
+        if (!rule.selector || rule.selector.includes(prefix)) return
+        if (rule.parent?.type === 'atrule' && /\bkeyframes$/i.test(rule.parent.name)) return
+
+        rule.selector = selectorParser((selectors) => {
+          selectors.each((sel) => {
+            if (!sel.nodes.length) return
+            const insertionIndex = sel.nodes.findLastIndex((n) => n.type !== 'pseudo') + 1
+            sel.nodes.splice(insertionIndex, 0, ...prefixNodes.map((n) => n.clone() as any))
+          })
+        }).processSync(rule.selector)
+      })
+    }
+  }
 }