Step-by-step guide on building a personalized rxjs operator using destructured parameters

I am in the process of developing a unique RxJS filter operator that requires a destructured array as a parameter.

Unfortunately, TypeScript seems to be throwing an error related to the type declaration:

Error TS2493: Tuple type '[]' with a length of '0' does not have an element at index '0'.


export function createCustomOperator<T extends []>() {
    return pipe(
        filter<T>(([param1, param2, param3])=> {
            //add your logic here
        })
    );
}

Answer №1

Utilize the rest operator (...) to unpack an array and then destructure its items. This informs the compiler that you intend to access elements within the array.

export function myCustomFunction<T extends []>() {
return pipe(
    filter<T>(([...[item1, item2, item3]])=> {
        //perform some operations
    })
);
}

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