Map to target array at specific index

[nguyen-vo]

Hi

I have a use case where I need to map source to a nested array at a specific index. I tried the following but it does not map to the target field lineItems[].products[0].name. Also is there a better way to apply conditions with array?

const mapper = createMapper({alwaysSet: true});
const src = {
  sources: [
    {
      name: 'item1',
      product: {id: '1'},
      upFrontFee: 123,
      permFee: 123,
      permPercentage: 123,
      workerStatus: 'active',
      publicHoliday: 'active',
      illness: 'active',
      optionType: null,
    },
    {
      name: 'item2',
      product: {id: '2'},
      optionType: 'standard',
    },
    {
      name: 'item3',
      product: {id: '3'},
      upFrontFee: 12,
      permFee: 13,
      permPercentage: 13,
      workerStatus: 'active',
      publicHoliday: 'active',
      illness: 'active',
      optionType: null,
    },
    {
      name: 'item4',
      product: {id: '4'},
      optionType: 'standard',
    },
  ],
};
mapper
  .map(['sources[]', 'sources[].name'])
  .to('lineItems[].products[0].name', (sources: any[], name: string[]) => {
    const values = sources.filter(
      (source: any) => name.includes(source.name) && source.optionType === null
    );
    return values.map((value: any) => value.name);
  });

I expect the result to be the following

{
  "lineItems":[
    {
      "products":[
        {
          "name":"item1"
        }
      ]
    },
    {
      "products":[
        {
          "name":"item3"
        }
      ]
    }
  ]
}

Actually, result:

{
  "lineItems":[
    {
      "products":[]
    }
  ]
}