What steps should I take to enable TypeScript IntelliSense to recommend correct suggestions within discriminated unions?

I am working on creating a checkbox UI component based on a design in Figma. The outline variant is specified to only be compatible with the large size, while the solid variant can be used with all sizes.

As a result, I am trying to build an interface where certain prop types are dependent on user input for other props within the same React component.

type ConditionalProps =
  | { variant: 'outlined'; size: 'large' }
  | { variant: 'solid'; size: 'small' | 'normal' | 'large' };

This is my current approach, which works almost perfectly. However, when I set the variant as outlined and the size as small, TypeScript throws an error:

Type '{ variant: "outlined"; size: "normal"; }' is not assignable to type 'IntrinsicAttributes & ConditionalProps'

One thing that bothers me is that IntelliSense suggests using type 'small' | 'normal' | 'large' when the variant is outlined. You can view the image below to see what I mean. Is there a way to resolve this issue? Am I misusing conditional types in this scenario?

https://i.sstatic.net/r1QRP.png

Answer №1

Currently, valid suggestions do not have a way to exclusively appear. The IntelliSense does not limit the union in a discriminated manner like needed in this scenario. This limitation has been acknowledged:

An experimental approach was attempted to address this issue, but unfortunately, it did not progress. If you encounter this problem, feel free to open an issue at microsoft/TypeScript

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