Switch from Prettier & ESLint to Biome

.github/workflows/ci.yml

@@ -11,6 +11,6 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-      - run: npm install && npm test && npm run lint
+      - run: npm install && npm test && npm run check
         env:
           CI: true

biome.json

@@ -0,0 +1,46 @@
+{
+  "$schema": "https://biomejs.dev/schemas/1.8.3/schema.json",
+  "files": {
+    "include": ["src/**/*.ts", "test/**/*.ts"]
+  },
+  "organizeImports": {
+    "enabled": false
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space"
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "complexity": {
+        "noUselessTypeConstraint": "off",
+        "noBannedTypes": "off",
+        "useArrowFunction": "off"
+      },
+      "suspicious": {
+        "noAssignInExpressions": "off",
+        "noExplicitAny": "off",
+        "noGlobalIsNan": "off",
+        "noImplicitAnyLet": "off"
+      },
+      "style": {
+        "noParameterAssign": "off",
+        "useNumberNamespace": "off",
+        "noNonNullAssertion": "off",
+        "noUselessElse": "off",
+        "useImportType": "off",
+        "useConst": "off",
+        "useNodejsImportProtocol": "off"
+      }
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "single",
+      "semicolons": "asNeeded",
+      "trailingCommas": "es5"
+    }
+  }
+}

package.json

@@ -19,31 +19,28 @@
     "node": ">=14.0.0"
   },
   "devDependencies": {
+    "@biomejs/biome": "1.8.3",
     "@rollup/plugin-typescript": "^11.1.6",
     "@types/expect": "^24.3.0",
     "@types/lodash": "^4.14.144",
     "@types/node": "^18.7.14",
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
-    "eslint": "^8.57.0",
-    "eslint-config-prettier": "^9.1.0",
-    "eslint-plugin-prettier": "^5.1.3",
     "lodash": "^4.17.15",
     "np": "^10.0.0",
-    "prettier": "^3.2.5",
     "rollup": "^4.12.1",
     "typescript": "^4.8.3",
     "vitest": "^1.6.0"
   },
   "scripts": {
     "build": "rm -rf ./{dist} && rollup --config ./rollup.config.js",
     "clean": "rm -rf ./{dist,node_modules}",
-    "fix": "npm run fix:eslint && npm run fix:prettier",
-    "fix:eslint": "npm run lint:eslint --fix",
-    "fix:prettier": "prettier '**/*.{js,json,ts}' --write",
-    "lint": "npm run lint:eslint && npm run lint:prettier",
-    "lint:eslint": "eslint '{src,test}/*.{js,ts}'",
-    "lint:prettier": "prettier '**/*.{js,json,ts}' --check",
+    "fix": "npx @biomejs/biome check --write .",
+    "fix:lint": "npx @biomejs/biome lint --write .",
+    "fix:format": "npx @biomejs/biome format --write .",
+    "check": "npx @biomejs/biome check .",
+    "check:lint": "npx @biomejs/biome lint .",
+    "check:format": "npx @biomejs/biome format .",
     "release": "npm run build && npm run lint && np",
     "test": "npm run build && npm run test:types && npm run test:vitest",
     "test:types": "tsc --noEmit && tsc --project ./test/tsconfig.json --noEmit",

src/utils.ts

@@ -200,7 +200,9 @@ export function* run<T, S>(
  */
 
 export type UnionToIntersection<U> = (
-  U extends any ? (arg: U) => any : never
+  U extends any
+    ? (arg: U) => any
+    : never
 ) extends (arg: infer I) => void
   ? I
   : never
@@ -230,10 +232,11 @@ export type IsMatch<T, G> = T extends G ? (G extends T ? T : never) : never
  * Check if a type is an exact match.
  */
 
-export type IsExactMatch<T, U> =
-  (<G>() => G extends T ? 1 : 2) extends <G>() => G extends U ? 1 : 2
-    ? T
-    : never
+export type IsExactMatch<T, U> = (<G>() => G extends T ? 1 : 2) extends <
+  G,
+>() => G extends U ? 1 : 2
+  ? T
+  : never
 
 /**
  * Check if a type is a record type.
@@ -265,7 +268,11 @@ export type IsTuple<T> = T extends [any]
  */
 
 export type IsUnion<T, U extends T = T> = (
-  T extends any ? (U extends T ? false : true) : false
+  T extends any
+    ? U extends T
+      ? false
+      : true
+    : false
 ) extends false
   ? never
   : T