wip: migrate to bun

test/isWeakMap.spec.ts

@@ -0,0 +1,50 @@
+import assert from 'node:assert';
+import lodashStable from 'lodash';
+import { weakMap, falsey, stubFalse, args, slice, map, symbol, realm } from './utils';
+import isWeakMap from '../src/isWeakMap';
+
+describe('isWeakMap', () => {
+    it('should return `true` for weak maps', () => {
+        if (WeakMap) {
+            assert.strictEqual(isWeakMap(weakMap), true);
+        }
+    });
+
+    it('should return `false` for non weak maps', () => {
+        const expected = lodashStable.map(falsey, stubFalse);
+
+        const actual = lodashStable.map(falsey, (value, index) =>
+            index ? isWeakMap(value) : isWeakMap(),
+        );
+
+        assert.deepStrictEqual(actual, expected);
+
+        assert.strictEqual(isWeakMap(args), false);
+        assert.strictEqual(isWeakMap([1, 2, 3]), false);
+        assert.strictEqual(isWeakMap(true), false);
+        assert.strictEqual(isWeakMap(new Date()), false);
+        assert.strictEqual(isWeakMap(new Error()), false);
+        assert.strictEqual(isWeakMap(slice), false);
+        assert.strictEqual(isWeakMap({ a: 1 }), false);
+        assert.strictEqual(isWeakMap(map), false);
+        assert.strictEqual(isWeakMap(1), false);
+        assert.strictEqual(isWeakMap(/x/), false);
+        assert.strictEqual(isWeakMap('a'), false);
+        assert.strictEqual(isWeakMap(symbol), 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) => isWeakMap({ constructor: value }));
+
+        assert.deepStrictEqual(actual, expected);
+    });
+
+    it('should work with weak maps from another realm', () => {
+        if (realm.weakMap) {
+            assert.strictEqual(isWeakMap(realm.weakMap), true);
+        }
+    });
+});