refactor(locale): use null as not applicable

[ST-DDT]

Created based on:

• feat: introduce locale proxy #2004 (comment)

I mean that's literally what null is for. From the MDN Docs:

The null value represents the intentional absence of any object value.

Instead of relying on magic values such as [], {}, '', ... we should use null as explicitly absent values.

[codecov]

Codecov Report

Merging #2078 (f60833d) into next (f795269) will increase coverage by 0.00%.
The diff coverage is 55.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #2078   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files        2538     2538           
  Lines      242656   242636   -20     
  Branches     1298     1300    +2     
=======================================
- Hits       241669   241659   -10     
+ Misses        960      950   -10     
  Partials       27       27           

Impacted Files	Coverage Δ
src/definitions/definitions.ts	0.00% <0.00%> (ø)
src/definitions/person.ts	0.00% <0.00%> (ø)
src/locales/az/company/suffix.ts	100.00% <100.00%> (ø)
src/locales/az/location/state.ts	100.00% <100.00%> (ø)
src/locales/az/person/female_prefix.ts	100.00% <100.00%> (ø)
src/locales/az/person/male_prefix.ts	100.00% <100.00%> (ø)
src/locales/az/person/prefix.ts	100.00% <100.00%> (ø)
src/locales/az/person/suffix.ts	100.00% <100.00%> (ø)
src/locales/id_ID/person/female_prefix.ts	100.00% <100.00%> (ø)
src/locales/id_ID/person/male_prefix.ts	100.00% <100.00%> (ø)
... and 21 more

... and 2 files with indirect coverage changes

[xDivisionByZerox]

What is the expected behavior for:

const result = mergeLocale([
 { 
    location: { 
      city: null,
      country: null,
    },
  },
 { 
    location: { 
      city: ['cityA'],
    },
  },
 { 
    location: { 
      country: ['countyA'],
    },
  }
]);

console.log(result); // ?

Is there anything we need to take care of in merging locales and null values?

[Shinigami92]

{ 
  location: { 
    city: null,
    country: null,
  },
}

🤔

[ST-DDT]

 { 
    location: { 
      city: null,
      country: null,
    },
  }

I'll write a test for that tomorrow, if I don't have one of those yet.

[xDivisionByZerox]

[...] if I don't have one of those yet.

Currently the word null does not exist in the merge-locale.spec.ts file.

[ST-DDT]

I added the missing test.

[xDivisionByZerox]

Thank you 👍