wip: migrate to bun

test/isNaN.spec.ts

@@ -0,0 +1,38 @@
+import assert from 'node:assert';
+import lodashStable from 'lodash';
+import { falsey, args, slice, symbol, realm } from './utils';
+import isNaN from '../src/isNaN';
+
+describe('isNaN', () => {
+    it('should return `true` for NaNs', () => {
+        assert.strictEqual(isNaN(NaN), true);
+        assert.strictEqual(isNaN(Object(NaN)), true);
+    });
+
+    it('should return `false` for non-NaNs', () => {
+        const expected = lodashStable.map(falsey, (value) => value !== value);
+
+        const actual = lodashStable.map(falsey, (value, index) => (index ? isNaN(value) : isNaN()));
+
+        assert.deepStrictEqual(actual, expected);
+
+        assert.strictEqual(isNaN(args), false);
+        assert.strictEqual(isNaN([1, 2, 3]), false);
+        assert.strictEqual(isNaN(true), false);
+        assert.strictEqual(isNaN(new Date()), false);
+        assert.strictEqual(isNaN(new Error()), false);
+        assert.strictEqual(isNaN(slice), false);
+        assert.strictEqual(isNaN({ a: 1 }), false);
+        assert.strictEqual(isNaN(1), false);
+        assert.strictEqual(isNaN(Object(1)), false);
+        assert.strictEqual(isNaN(/x/), false);
+        assert.strictEqual(isNaN('a'), false);
+        assert.strictEqual(isNaN(symbol), false);
+    });
+
+    it('should work with `NaN` from another realm', () => {
+        if (realm.object) {
+            assert.strictEqual(isNaN(realm.nan), true);
+        }
+    });
+});