chore: replace prettier with biome

.github/workflows/quality.yaml

@@ -12,7 +12,6 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       rust: ${{ steps.filter.outputs.rust }}
-      markdown: ${{ steps.filter.outputs.markdown }}
       site: ${{ steps.filter.outputs.site }}
       infra: ${{ steps.filter.outputs.infra }}
     steps:
@@ -27,8 +26,6 @@ jobs:
               - 'Cargo.lock'
               - 'rust-toolchain.toml'
               - 'rustfmt.toml'
-            markdown:
-              - '**/*.md'
             site:
               - 'site/**'
             infra:
@@ -61,18 +58,6 @@ jobs:
       - uses: cachix/install-nix-action@v31
       - run: nix develop .#ci --command just rust-lint
 
-  markdown:
-    name: Markdown Format Check
-    needs: changes
-    if:
-      needs.changes.outputs.markdown == 'true' || needs.changes.outputs.infra ==
-      'true'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v31
-      - run: nix develop .#ci --command just markdown-format
-
   flake-check:
     name: Nix Flake Check
     runs-on: ubuntu-latest

flake.nix

@@ -26,7 +26,7 @@
           pkgs.cargo-watch
           pkgs.nodejs_22
           pkgs.pnpm
-          pkgs.prettier
+          pkgs.biome
           pkgs.just
         ];
       in

justfile

@@ -1,7 +1,7 @@
 default:
     @just --list
 
-format: rust-format markdown-format site-format
+format: rust-format site-format
     @:
 
 lint: rust-lint site-check flake-check
@@ -19,9 +19,6 @@ rust-format:
 rust-lint:
     cargo clippy --all-targets -- -D warnings
 
-markdown-format:
-    prettier --check .
-
 site-install:
     cd site && pnpm install --frozen-lockfile
 

site/biome.json

@@ -0,0 +1,24 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.4.13/schema.json",
+  "files": {
+    "ignoreUnknown": true
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 80
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "double",
+      "semicolons": "always"
+    }
+  },
+  "linter": {
+    "enabled": false
+  },
+  "assist": {
+    "enabled": false
+  }
+}

site/package.json

@@ -8,7 +8,7 @@
     "build": "astro build",
     "preview": "astro preview",
     "check": "astro check",
-    "format:check": "prettier --check 'src/**/*.{astro,mdx,css}' astro.config.mjs"
+    "format:check": "biome format astro.config.mjs biome.json package.json tsconfig.json src"
   },
   "dependencies": {
     "@astrojs/mdx": "^4.3.14",
@@ -17,8 +17,7 @@
   },
   "devDependencies": {
     "@astrojs/check": "^0.9.8",
-    "prettier": "^3.8.1",
-    "prettier-plugin-astro": "^0.14.1",
+    "@biomejs/biome": "^2.4.13",
     "typescript": "^5.9.3"
   }
 }