vendure/packages/common/src/simple-deep-clone.spec.ts

import { simpleDeepClone } from './simple-deep-clone';

describe('simpleDeepClone()', () => {
    it('clones a simple flat object', () => {
        const target = { a: 1, b: 2 };
        const result = simpleDeepClone(target);

        expect(result).toEqual(target);
        expect(result).not.toBe(target);
    });

    it('clones a simple deep object', () => {
        const target = { a: 1, b: { c: 3, d: [1, 2, 3] } };
        const result = simpleDeepClone(target);

        expect(result).toEqual(target);
        expect(result).not.toBe(target);
    });

    it('clones a simple flat array', () => {
        const target = [1, 2, 3];
        const result = simpleDeepClone(target);

        expect(result).toEqual(target);
        expect(result).not.toBe(target);
    });

    it('clones a simple deep array', () => {
        const target = [1, [2, 3], [4, [5, [6]]]];
        const result = simpleDeepClone(target);

        expect(result).toEqual(target);
        expect(result).not.toBe(target);
    });

    it('passes through primitive types', () => {
        expect(simpleDeepClone(1)).toBe(1);
        expect(simpleDeepClone('a')).toBe('a');
        expect(simpleDeepClone(true as any)).toBe(true);
        expect(simpleDeepClone(null as any)).toBe(null);
        expect(simpleDeepClone(undefined as any)).toBe(undefined);
    });

    it('does not clone class instance', () => {
        const target = new Foo();
        const result = simpleDeepClone(target);

        expect(result).toBe(target);
    });

    it('does not clone class instance in array', () => {
        const foo = new Foo();
        const target = [foo];
        const result = simpleDeepClone(target);

        expect(result).toEqual(target);
        expect(result).not.toBe(target);
        expect(result[0]).toBe(target[0]);
    });

    it('does not clone class instance in object', () => {
        const foo = new Foo();
        const target = { a: foo };
        const result = simpleDeepClone(target);

        expect(result).toEqual(target);
        expect(result).not.toBe(target);
        expect(result.a).toBe(target.a);
    });

    it('clone does not share references with original', () => {
        const original = { user: { name: 'mike' } };
        const clone = simpleDeepClone(original);

        original.user.name = 'pete';

        expect(clone.user.name).toEqual('mike');
    });
});

class Foo {}