lodash/test/isWeakSet.spec.ts

import assert from 'node:assert';
import lodashStable from 'lodash';
import { weakSet, falsey, stubFalse, args, slice, set, symbol, realm } from './utils';
import isWeakSet from '../src/isWeakSet';

describe('isWeakSet', () => {
    it('should return `true` for weak sets', () => {
        if (WeakSet) {
            assert.strictEqual(isWeakSet(weakSet), true);
        }
    });

    it('should return `false` for non weak sets', () => {
        const expected = lodashStable.map(falsey, stubFalse);

        const actual = lodashStable.map(falsey, (value, index) =>
            index ? isWeakSet(value) : isWeakSet(),
        );

        assert.deepStrictEqual(actual, expected);

        assert.strictEqual(isWeakSet(args), false);
        assert.strictEqual(isWeakSet([1, 2, 3]), false);
        assert.strictEqual(isWeakSet(true), false);
        assert.strictEqual(isWeakSet(new Date()), false);
        assert.strictEqual(isWeakSet(new Error()), false);
        assert.strictEqual(isWeakSet(slice), false);
        assert.strictEqual(isWeakSet({ a: 1 }), false);
        assert.strictEqual(isWeakSet(1), false);
        assert.strictEqual(isWeakSet(/x/), false);
        assert.strictEqual(isWeakSet('a'), false);
        assert.strictEqual(isWeakSet(set), false);
        assert.strictEqual(isWeakSet(symbol), false);
    });

    it('should work with weak sets from another realm', () => {
        if (realm.weakSet) {
            assert.strictEqual(isWeakSet(realm.weakSet), true);
        }
    });
});