wip: migrate to bun

test/last.spec.ts

@@ -0,0 +1,55 @@
+import assert from 'node:assert';
+import lodashStable from 'lodash';
+import { LARGE_ARRAY_SIZE } from './utils';
+import last from '../src/last';
+
+describe('last', () => {
+    const array = [1, 2, 3, 4];
+
+    it('should return the last element', () => {
+        assert.strictEqual(last(array), 4);
+    });
+
+    it('should return `undefined` when querying empty arrays', () => {
+        const array = [];
+        array['-1'] = 1;
+
+        assert.strictEqual(last([]), undefined);
+    });
+
+    it('should work as an iteratee for methods like `_.map`', () => {
+        const array = [
+                [1, 2, 3],
+                [4, 5, 6],
+                [7, 8, 9],
+            ],
+            actual = lodashStable.map(array, last);
+
+        assert.deepStrictEqual(actual, [3, 6, 9]);
+    });
+
+    it('should return an unwrapped value when implicitly chaining', () => {
+        assert.strictEqual(_(array).last(), 4);
+    });
+
+    it('should return a wrapped value when explicitly chaining', () => {
+        assert.ok(_(array).chain().last() instanceof _);
+    });
+
+    it('should not execute immediately when explicitly chaining', () => {
+        const wrapped = _(array).chain().last();
+        assert.strictEqual(wrapped.__wrapped__, array);
+    });
+
+    it('should work in a lazy sequence', () => {
+        const largeArray = lodashStable.range(LARGE_ARRAY_SIZE),
+            smallArray = array;
+
+        lodashStable.times(2, (index) => {
+            const array = index ? largeArray : smallArray,
+                wrapped = _(array).filter(isEven);
+
+            assert.strictEqual(wrapped.last(), last(_.filter(array, isEven)));
+        });
+    });
+});