Supported & Experimental Languages in Biome

From the Biome cheat sheet · Overrides & Language Support · verified Aug 2026

Know which file types are stable and which require explicit opt-in.

json

{
  "html": {
    "experimentalFullSupportEnabled": true
  }
}

🟢 JS, TS, JSX, TSX, JSON, CSS, and GraphQL are supported

📌 Vue, Svelte, and Astro support remains experimental

💡 Embedded CSS and GraphQL template parsing is opt-in

🔍 Check language support before replacing specialized tools

languageshtmlvuesvelteastro

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