Improve typing of Autocomplete

[olavis]

          @oddvernes How about this?

type Options<T extends Array<unknown>> = T extends Array<string>
  ? Array<string>
  : { objects: T; label: (option: T[number]) => string }

Defining options in Autocomplete: options: Options<T[]>

Example, using string[] and MyOptionType as object type:

type StringType = Options<string[]> // string[]
type ObjectType = Options<
  {
    label: string
    symbol?: string | undefined
    trend?: string | undefined
  }[]
> /*
  {
    objects: {
        label: string;
        symbol?: string | undefined;
        trend?: string | undefined;
    }[];
    label: (option: {
        label: string;
        symbol?: string | undefined;
        trend?: string | undefined;
    }) => string;
  }
 */

Then you'd define options like this when you're using objects as options (it type errors if you don't include label and informs about the missing properties) options={{ objects: options, label: optionLabel }}, and yet no complaints from TypeScript if you define options as string array: options={['Option1', 'Option2']}.

Originally posted by @olavis in #2976 (comment)

[oddvernes]

Thanks for the suggestion, we will take a look at this! 👍

[oddvernes]

resolved by #3408