wip: migrate to bun

test/isSet.spec.ts

@@ -0,0 +1,48 @@
+import assert from 'node:assert';
+import lodashStable from 'lodash';
+import { set, falsey, stubFalse, args, slice, symbol, weakSet, realm } from './utils';
+import isSet from '../src/isSet';
+
+describe('isSet', () => {
+    it('should return `true` for sets', () => {
+        if (Set) {
+            assert.strictEqual(isSet(set), true);
+        }
+    });
+
+    it('should return `false` for non-sets', () => {
+        const expected = lodashStable.map(falsey, stubFalse);
+
+        const actual = lodashStable.map(falsey, (value, index) => (index ? isSet(value) : isSet()));
+
+        assert.deepStrictEqual(actual, expected);
+
+        assert.strictEqual(isSet(args), false);
+        assert.strictEqual(isSet([1, 2, 3]), false);
+        assert.strictEqual(isSet(true), false);
+        assert.strictEqual(isSet(new Date()), false);
+        assert.strictEqual(isSet(new Error()), false);
+        assert.strictEqual(isSet(slice), false);
+        assert.strictEqual(isSet({ a: 1 }), false);
+        assert.strictEqual(isSet(1), false);
+        assert.strictEqual(isSet(/x/), false);
+        assert.strictEqual(isSet('a'), false);
+        assert.strictEqual(isSet(symbol), false);
+        assert.strictEqual(isSet(weakSet), false);
+    });
+
+    it('should work for objects with a non-function `constructor` (test in IE 11)', () => {
+        const values = [false, true],
+            expected = lodashStable.map(values, stubFalse);
+
+        const actual = lodashStable.map(values, (value) => isSet({ constructor: value }));
+
+        assert.deepStrictEqual(actual, expected);
+    });
+
+    it('should work with weak sets from another realm', () => {
+        if (realm.set) {
+            assert.strictEqual(isSet(realm.set), true);
+        }
+    });
+});