@breautek/merge-change/test/any-types.spec.js

Simple library for deep merge of objects and other types (also for patch and immutable updates). Declarative operations to specific merge, for example to remove properties. Customize merging between specific types. Calculating diffs.

const mc = require('../index.js');

describe('Test any types', () => {

  test('undefined + undefined', () => {
    const first = undefined
    const second = undefined;
    const result = mc.merge(first, second);
    expect(result).toEqual(undefined);
  });

  test('undefined + operations', () => {
    const first = undefined
    const second = {$set: {'x': 0}};
    const result = mc.merge(first, second);
    expect(result).toEqual({x: 0});

    const second2 = {$set: {'x': 0}};
    const result2 = mc.update(first, second2);
    expect(result2).toEqual({x: 0});

    const second3 = {$set: {'x': 0}};
    const result3 = mc.patch(first, second3);
    expect(result3).toEqual({x: 0});
  });

  test('object + operations', () => {
    const first = {};
    const second = {$set: {'x': 0}};
    const result = mc.merge(first, second);
    expect(result).toEqual({x: 0});

    const result2 = mc.update(first, second);
    expect(result2).toEqual({x: 0});

    const result3 = mc.patch(first, second);
    expect(result3).toEqual({x: 0});
  });

})