turn off no-negated-condition

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [^18, ^20]
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm run test

package.json

@@ -8,7 +8,7 @@
   "main": "./src/index.js",
   "exports": "./src/index.js",
   "engines": {
-    "node": ">=20"
+    "node": ">=18"
   },
   "scripts": {
     "test": "eslint . && prettier --check .",

src/index.js

@@ -112,7 +112,7 @@ module.exports = {
         "unicorn/no-array-for-each": "error",
         "unicorn/no-array-push-push": "error",
         "unicorn/no-instanceof-array": "error",
-        "unicorn/no-negated-condition": "error",
+        "unicorn/no-negated-condition": "off",
         "unicorn/no-static-only-class": "error",
         "unicorn/no-thenable": "error",
         "unicorn/no-unnecessary-await": "error",

src/rules/prefer-arrow-functions.js

@@ -28,7 +28,7 @@ const isConstructor = (node) => {
 };
 
 const containsThis = (node) => {
-  if (typeof node !== "object" || node === null) {
+  if (node == null) {
     return false;
   }
   if (node.type === "FunctionDeclaration") {