@breautek/merge-change/test/$unset.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 $unset', () => {

  test('unset one prop (merge)', () => {
    const first = {
      f1: {a1: [1,2,3,4,5], a2: 11, a3: 12},
      f2: 10,
    };
    const second = {
      $unset: ['f2'],
    };
    const result = mc.merge(first, second);
    expect(result).toEqual({
      f1: {a1: [1,2,3,4,5], a2: 11, a3: 12},
    });
  });

  test('unset with set', () => {
    const first = {
      f1: {a1: [1,2,3,4,5], a2: 11, a3: 12},
      f2: 10,
    };
    const second = {
      f5: 30,
      $set: {
        f3: '10',
        f4: '20'
      },
      $unset: ['f2', 'f3'],
    };
    const result = mc.merge(first, second);
    expect(result).toEqual({
      f1: {a1: [1,2,3,4,5], a2: 11, a3: 12},
      f4: '20',
      f5: 30,
    });
  });

  test('set with empty unset', () => {
    const first = {
    };
    const second = {
      $set: {
        f1: '10',
        f2: '20'
      },
      $unset: [],
    };
    const result = mc.merge(first, second);
    expect(result).toEqual({
      f1: '10',
      f2: '20'
    });
  });

  test('clear root object', () => {
    const first = {
      f1: {a1: [1,2,3,4,5], a2: 11, a3: 12},
      f2: 10,
    };
    const second = {
      $unset: ['*'],
    };
    const result = mc.merge(first, second);
    expect(result).toEqual({});
  });

});