Whenever comparing the types 'string[]' and 'DeliveryTypeEnum', this condition will consistently result in 'true' as there is no intersection between the two. This is highlighted by the error code ts(2367)

Hello everyone, I'm a junior developer and could use some assistance

        if (query.deliveryType && query.deliveryType != DeliveryTypeEnum.EITHER) {
            search.push({
                terms: {
                    "deliveryType.keyword": [query.deliveryType, DeliveryTypeEnum.EITHER],
                },
            });
        }

The delivery type is a string array

I'm encountering an error: "This condition will always return 'true' since the types 'string[]' and 'DeliveryTypeEnum' have no overlap." in TypeScript (2367)

The error originates from this line of code 

query.deliveryType && query.deliveryType != DeliveryTypeEnum.EITHER

typescriptnext.jsnestjs

Answer №1

Given that query.deliveryType is an Array, you have the flexibility to utilize array methods such as includes. Therefore, if your delivery Types array does not contain 'EITHER', you can proceed with any desired actions.

You can achieve this by:

if (query.deliveryType && !query.deliveryType.includes(DeliveryTypeEnum.EITHER)){
   // Implement your custom logic here!
}

To delve deeper into the includes function, refer to this helpful resource: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes

Answer №2

When the if statement triggers an error, it is a sign that the intended behavior may not be achieved because the variable type of query.deliveryType suggests that it will never equal DeliveryTypeEnum.EITHER.

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