{
  "url": "https://unifast.dev/ko/docs/packages/core/extract-lang/",
  "locale": "ko",
  "title": "extractLang()",
  "description": "코드 요소의 className에서 프로그래밍 언어를 추출합니다.",
  "section": "packages",
  "body": "```ts\nimport { extractLang } from \"@unifast/core\";\n```\n\n## 시그니처\n\n```ts\nfunction extractLang(code: HastElement): string | null\n```\n\n## 매개변수\n\n### code\n\n| 속성 | 타입 | 기본값 | 설명 |\n|----------|------|---------|-------------|\n| `type` | `\"element\"` | — | 노드 타입 식별자 |\n| `tagName` | `string` | — | HTML 태그 이름 (일반적으로 `\"code\"`) |\n| `properties` | `Record<string, unknown>` | — | `className`을 포함한 요소 속성 |\n| `children` | `HastNode[]` | — | 요소의 자식 노드 |\n\n## 반환값\n\n`string | null` — 첫 번째 `language-*` 클래스에서 추출한 언어 식별자. 언어 클래스가 없으면 `null`.\n\n## 사용법\n\n```ts\nimport { extractLang } from \"@unifast/core\";\nimport type { HastElement } from \"@unifast/core\";\n\nconst codeElement: HastElement = {\n  type: \"element\",\n  tagName: \"code\",\n  properties: { className: [\"language-typescript\"] },\n  children: [{ type: \"text\", value: \"const x = 1;\" }],\n};\n\nconst lang = extractLang(codeElement);\n\nconsole.log(lang);\n// typescript\n```\n\n## 예시\n\n### 코드 요소에서 언어 추출\n\n```ts\nimport { extractLang } from \"@unifast/core\";\nimport type { HastElement } from \"@unifast/core\";\n\nconst code: HastElement = {\n  type: \"element\",\n  tagName: \"code\",\n  properties: { className: [\"language-js\", \"highlight\"] },\n  children: [{ type: \"text\", value: \"console.log('hello');\" }],\n};\n\nconsole.log(extractLang(code));\n// js\n```\n\n### 언어 클래스가 없는 경우\n\n```ts\nimport { extractLang } from \"@unifast/core\";\nimport type { HastElement } from \"@unifast/core\";\n\nconst code: HastElement = {\n  type: \"element\",\n  tagName: \"code\",\n  properties: { className: [\"highlight\"] },\n  children: [{ type: \"text\", value: \"plain text\" }],\n};\n\nconsole.log(extractLang(code));\n// null\n```\n\n### className이 배열이 아닌 경우\n\n```ts\nimport { extractLang } from \"@unifast/core\";\nimport type { HastElement } from \"@unifast/core\";\n\nconst code: HastElement = {\n  type: \"element\",\n  tagName: \"code\",\n  properties: {},\n  children: [{ type: \"text\", value: \"no classes\" }],\n};\n\nconsole.log(extractLang(code));\n// null\n```\n\n### findCodeChild와 함께 사용\n\n```ts\nimport { extractLang, findCodeChild } from \"@unifast/core\";\nimport type { HastElement } from \"@unifast/core\";\n\nconst pre: HastElement = {\n  type: \"element\",\n  tagName: \"pre\",\n  properties: {},\n  children: [\n    {\n      type: \"element\",\n      tagName: \"code\",\n      properties: { className: [\"language-python\"] },\n      children: [{ type: \"text\", value: \"print('hello')\" }],\n    },\n  ],\n};\n\nconst code = findCodeChild(pre);\nif (code) {\n  console.log(extractLang(code));\n  // python\n}\n```",
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      "api": "https://unifast.dev//api/docs/packages/core/extract-lang.json"
    },
    {
      "locale": "ja",
      "url": "https://unifast.dev/ja/docs/packages/core/extract-lang/",
      "api": "https://unifast.dev//api/ja/docs/packages/core/extract-lang.json"
    },
    {
      "locale": "zh-CN",
      "url": "https://unifast.dev/zh-CN/docs/packages/core/extract-lang/",
      "api": "https://unifast.dev//api/zh-CN/docs/packages/core/extract-lang.json"
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      "locale": "zh-TW",
      "url": "https://unifast.dev/zh-TW/docs/packages/core/extract-lang/",
      "api": "https://unifast.dev//api/zh-TW/docs/packages/core/extract-lang.json"
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      "api": "https://unifast.dev//api/fr/docs/packages/core/extract-lang.json"
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      "locale": "it",
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      "api": "https://unifast.dev//api/it/docs/packages/core/extract-lang.json"
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      "locale": "es",
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      "api": "https://unifast.dev//api/es/docs/packages/core/extract-lang.json"
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    {
      "locale": "pt-BR",
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      "api": "https://unifast.dev//api/pt-BR/docs/packages/core/extract-lang.json"
    },
    {
      "locale": "de",
      "url": "https://unifast.dev/de/docs/packages/core/extract-lang/",
      "api": "https://unifast.dev//api/de/docs/packages/core/extract-lang.json"
    },
    {
      "locale": "ru",
      "url": "https://unifast.dev/ru/docs/packages/core/extract-lang/",
      "api": "https://unifast.dev//api/ru/docs/packages/core/extract-lang.json"
    },
    {
      "locale": "hi",
      "url": "https://unifast.dev/hi/docs/packages/core/extract-lang/",
      "api": "https://unifast.dev//api/hi/docs/packages/core/extract-lang.json"
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      "locale": "id",
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      "api": "https://unifast.dev//api/id/docs/packages/core/extract-lang.json"
    },
    {
      "locale": "tr",
      "url": "https://unifast.dev/tr/docs/packages/core/extract-lang/",
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}