{
  "url": "https://unifast.dev/ja/docs/packages/node/code-meta/",
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  "title": "codeMeta()",
  "description": "コードフェンスのメタ文字列をパースして、コードブロックのデータ属性へ変換します。",
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  "body": "```ts\nimport { codeMeta } from \"@unifast/node\";\n```\n\n## シグネチャ\n\n```ts\nfunction codeMeta(): UnifastPlugin\n```\n\n## パラメータ\n\nなし。\n\n## 使い方\n\n```ts\nimport { compile, codeMeta } from \"@unifast/node\";\n\nconst md = `\\`\\`\\`js title=\"example.js\"\nconsole.log(\"hello\");\n\\`\\`\\``;\n\nconst result = compile(md, {\n  plugins: [codeMeta()],\n});\n// The <pre> element gets data-title=\"example.js\"\n```\n\n## 使用例\n\n### 基本的なメタのパース\n\n`codeMeta()` プラグインは、フェンスドコードブロックの言語識別子の後に続くメタ文字列をパースし、認識したキーを `<pre>` 要素の `data-*` 属性へ変換します。\n\n```ts\nimport { compile, codeMeta } from \"@unifast/node\";\n\nconst md = `\\`\\`\\`js title=\"app.ts\"\nconst x = 1;\n\\`\\`\\``;\n\nconst result = compile(md, { plugins: [codeMeta()] });\nconsole.log(result.output);\n// <pre data-lang=\"js\" data-title=\"app.ts\"><code class=\"language-js\">const x = 1;\n// </code></pre>\n```\n\n### 複数のメタ属性\n\n`title`、行ハイライト用の `{1,3-5}`、`showLineNumbers`、`diff`、`wordWrap` など、複数のメタ属性を組み合わせられます。\n\n```ts\nimport { compile, codeMeta } from \"@unifast/node\";\n\nconst md = `\\`\\`\\`ts title=\"server.ts\" {1,3} showLineNumbers\nimport express from \"express\";\nconst app = express();\napp.listen(3000);\n\\`\\`\\``;\n\nconst result = compile(md, { plugins: [codeMeta()] });\n// The <pre> element receives:\n//   data-title=\"server.ts\"\n//   Lines 1 and 3 get data-highlighted attributes\n//   showLineNumbers is recognized as a boolean flag\n```",
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