fix: error when passing prop: undefined

before it was changed to [undefined]

src/utils/flat/get.spec.ts

@@ -32,6 +32,12 @@ describe('module:flat.get', () => {
     expect(get(params, 'nameNotExisting')).to.be.undefined
   })
 
+  it('returns undefined for property set to undefined', () => {
+    expect(get({
+      property: undefined as any,
+    }, 'property')).to.be.undefined
+  })
+
   it('returns nested array', () => {
     expect(get(params, 'interest.OfMe')).to.deep.equal([
       'javascript',

src/utils/flat/get.ts

@@ -19,7 +19,10 @@ const get = (params: FlattenParams = {}, propertyPath?: string): any => {
     return unflatten(params)
   }
 
-  if (typeof params[propertyPath] !== 'undefined') {
+  // when object has this key - simply return it
+  // we cannot rely on typeof params[propertyPath !== 'undefined' because params can actually be
+  // undefined and in such case if would pass and function would return [undefined]
+  if (Object.keys(params).find(key => (key === propertyPath))) {
     return params[propertyPath]
   }