Change MessageFormatter's function signature

[dkzlv]

Is your feature request related to a problem? Please describe.
Currently there's no simple way to use the embedded $format (_) in TypeScript, since it returns a function, that returns string | unknown. You cannot pass values as props with string type, you cannot use it in most of the HTML attributes (like placeholder), etc.

Describe the solution you'd like
Change signature for MessageFormatter's function to string instead of string | unknown. Or any if unknown is there for a very valid reason (not sure, the documentation here states that it always returns string).

Describe alternatives you've considered
I've wrapped it myself in my project.

import { _ as $format } from 'svelte-i18n';
import { MessageObject } from 'svelte-i18n/types/runtime/types';
import { Readable } from 'svelte/store';

export const _ = $format as Readable<
  (id: string | MessageObject, options?: MessageObject) => string
>;

Not very clean or beautiful, tbh.

How important is this feature to you?
Quite!

[kaisermann]

Hey 👋 fixed in 3.2.7! Since 3.2.0, the format method can also return an object or array, but setting it to return unknown was indeed a mistake.

[dkzlv]

@kaisermann Holy shit you're fast. Thanks! ❤️