Tips for transferring a boolean value to a generic parameter in Java?

Looking to pass a boolean value to the Generic type in order to be utilized within a condition.

This is the generic type

interface OptionTypeBase {
    [key: string]: any;
}

type OptionsType<OptionType extends OptionTypeBase> = ReadonlyArray<OptionType>;

export type ValueType<OptionType extends OptionTypeBase, IsMulti extends boolean> = IsMulti extends true
    ? OptionsType<OptionType>
    : OptionType | null;

Within my React component, I receive an isMulti prop from the parent component. How do I correctly pass this value of isMulti so that the specified generic type can accurately determine the type for a condition?

I attempted the following approach, but it appears to be incorrect.

ValueType<IOption<T>, typeof isMulti>
javascriptreactjstypescriptgenericstypes

Answer №1

In my opinion, it might be worth considering an alternative approach to avoid potential complications. One suggestion is to modify the isMulti parameter to make it generic. A possible solution could look like this:

const CustomComponent = <T extends any, IsMultiple extends boolean>(
  {item, isMultiple}: {item: T, isMultiple: IsMultiple}
) => {
  const result: ValueType<IOption<T>, IsMultiple> = ...
  return <div></div>
}

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