feat: `transformChoice` options for checkbox

[matthyk]

feat: `transformChoice` options for checkbox

[SBoudrias]

The older checkbox prompt had a short option to shorten long choices: https://github.com/SBoudrias/Inquirer.js/blob/master/packages/inquirer/lib/prompts/checkbox.js

I don't know we need to keep the same API, but it's an option. Also, if we want to shorten the display, maybe we're better with a rendering function receiving the whole option list (so you could custom format like "a, b and 3 others", etc)

[matthyk]

@SBoudrias Are you open for a PR?

[SBoudrias]

Yes, happy to review and merge a PR.

I would recommend us aligning on the right approach to the problem though - want to make sure you don't waste your time if we end up feeling a different API would cover more cases!

[matthyk]

I would go with your second option, to provide a rendering function. I think it is the most flexible option. We could provide the rendering function with the list of all options AND the list of all selected options. Something like:

type RenderFn = (choices: ReadonlyArray<Choice<Value> | Separator>, selectedChoices: ReadonlyArray<Choice<Value>>) => string

But I'm open to everything.

[SBoudrias]

Yeah, that works. I like it - it's probably the most flexible option.

Just a nit that I'd flip the function params for all choices and selected choices.