refactor: swap out eslint/prettier for biome

Author: amandaguthrie

.eslintignore

@@ -6,12 +6,12 @@ runs:
   steps:
     - uses: pnpm/action-setup@v3
       with:
-        version: 9.x.x
+        version: 10.x.x
 
     - name: Setup Node.js
       uses: actions/setup-node@v4
       with:
-        node-version: 20.x
+        node-version: 22.x
         registry-url: 'https://registry.npmjs.org'
         cache: 'pnpm'
 

.eslintrc

@@ -19,7 +19,7 @@ concurrency:
 
 jobs:
   prettier:
-    name: Prettier
+    name: Format
     # Don't run on the first run after creating from template. (run_number == 1).
     if: github.run_number != 1
     runs-on: ubuntu-latest
@@ -30,8 +30,8 @@ jobs:
       - name: Install
         uses: ./.github/composite-actions/install
 
-      - name: Run Prettier
-        run: pnpm prettier
+      - name: Run Biome
+        run: pnpm format
 
   tests:
     name: Unit Tests

.github/composite-actions/install/action.yml

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2024 Amanda Guthrie
+Copyright (c) 2025 Amanda Guthrie
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

.github/workflows/quality.yml

@@ -3,12 +3,11 @@
 ## Highlights
 
 - changesets
-- eslint
 - GitHub issue templates
 - GitHub quality and release workflows
 - pnpm workspace monorepo
-- prettier
-- Top-level build, reset, lint, prettier, test, typecheck, and release scripts.
+- biome
+- Top-level build, reset, biome, test, typecheck, and release scripts.
 - Typescript
 
 ## Initial Configuration

.prettierignore

@@ -0,0 +1,49 @@
+{
+  "$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
+  "files": {
+    "ignore": ["build", "dist", "node_modules", "**/*.md", "pnpm-lock.yaml"]
+  },
+  "organizeImports": {
+    "enabled": true
+  },
+  "formatter": {
+    "lineWidth": 120
+  },
+  "javascript": {
+    "formatter": {
+      "enabled": true,
+      "quoteStyle": "single",
+      "jsxQuoteStyle": "double",
+      "trailingCommas": "all",
+      "semicolons": "always",
+      "bracketSpacing": true
+    }
+  },
+  "json": {
+    "formatter": {
+      "enabled": true,
+      "indentWidth": 2
+    },
+    "parser": {
+      "allowComments": true
+    }
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+
+      "correctness": {
+        "noUnusedVariables": {
+          "level": "error"
+        }
+      },
+      "suspicious": {
+        "noExplicitAny": "off"
+      },
+      "style": {
+        "noNonNullAssertion": "off"
+      }
+    }
+  }
+}

.prettierrc

@@ -17,34 +17,28 @@
     "build-fast": "pnpm -r --parallel --filter=./packages/** build-fast",
     "build": "pnpm -r --filter=./packages/** build",
     "reset": "pnpm -r --parallel exec rimraf node_modules dist && rimraf node_modules dist",
-    "lint": "eslint --ext .ts ",
-    "prettier": "prettier --check packages",
-    "prettier-fix": "prettier --write packages",
+    "format": "pnpm biome lint packages",
+    "format:fix": "pnpm biome check --write packages",
     "test": "pnpm -r --parallel --filter=./packages/** test --if-present",
     "typecheck": "tsc --noEmit",
     "release": "changeset publish",
     "release:dev:version": "changeset version --snapshot dev",
     "release:dev:publish": "changeset publish --no-git-tag --tag dev"
   },
   "devDependencies": {
-    "@changesets/changelog-github": "^0.5.0",
-    "@changesets/cli": "^2.27.3",
-    "@types/eslint": "^8.56.10",
-    "@types/node": "^20.12.12",
-    "@typescript-eslint/eslint-plugin": "^7.11.0",
-    "@typescript-eslint/parser": "^7.11.0",
-    "eslint": "^8.57.0",
-    "eslint-config-prettier": "^9.1.0",
-    "glob": "^10.4.1",
-    "prettier": "^3.2.5",
-    "rimraf": "^5.0.7",
-    "tsup": "^8.0.2",
-    "tsx": "^4.11.0",
-    "typescript": "^5.4.5"
+    "@biomejs/biome": "1.9.4",
+    "@changesets/changelog-github": "^0.5.1",
+    "@changesets/cli": "^2.28.1",
+    "@types/node": "^22.13.9",
+    "glob": "^11.0.1",
+    "rimraf": "^6.0.1",
+    "tsup": "^8.4.0",
+    "tsx": "^4.19.3",
+    "typescript": "^5.8.2"
   },
-  "packageManager": "pnpm@9.1.2",
+  "packageManager": "pnpm@10.5.2",
   "engines": {
-    "node": ">=18.0.0 <21",
-    "pnpm": "^9.0.0"
+    "node": "22.x",
+    "pnpm": "^10.0.0"
   }
 }