在 Typescript 中，如何指定可以返回多种类型的函数的返回类型？

Question

I have a reusable method getFilters that can return a number of different types

getFilters(): IListFilteringType {...}

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

When I call getFilters how can I specify that I know that the returned value with be of type IListFilteringTypeMultiSelect and not one of the other possible values of IListFilteringType ?

Thank you

Answer 1

如果您确定特定执行的函数返回的类型，则可以使用as返回值。

const variable = functionResponse as IListFilteringTypeMultiSelect;