How do I specify the return type of a function in Typescript that can return more than one type?

I am facing a situation where I have a method called getFilters that retrieves various types of values.

getFilters(): IListFilteringType {...}

type IListFilteringTypeMultiSelect = (string | number)[];
type IListFilteringType = boolean | string | number | IListFilteringTypeMultiSelect;

Now, my question is, how can I explicitly specify the expected type of the returned value from getFilters to be IListFilteringTypeMultiSelect, rather than one of the other possible types defined in IListFilteringType?

Your help is greatly appreciated.

javascripttypescript

Answer №1

When you have confidence in the expected return type of a function during a specific run, you have the option to convert the return value by using the as keyword.

let result = functionResult as SpecificReturnType;

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