In TypeScript, what is the format in which the final type result of a generic utility type is shown?

After utilizing the provided code, I have encountered an issue with retrieving the ultimate type of type A in the editor. Despite my efforts, the editor persistently showcases the composite form of the generic utility, complicating the process of verifying the type output during code composition. Is there a technique to compel TypeScript to compute and display the final type result within the editor interface?

import type {GetKeyOf} from "typescript-treasure"
interface EmitterMasterEventMap
{
    [p: string]: never;
}

type A = GetKeyOf<EmitterMasterEventMap>[]; // How can I access the definitive type of type A within the editor?
typescript

Answer №1

TypeScript does not provide any assurances regarding the appearance of types in IntelliSense, and it does not offer explicit options for customization. There have been multiple feature requests on GitHub addressing this issue, like microsoft/TypeScript#34556 and microsoft/TypeScript#47980. Users who wish to see changes in this regard can show support by liking these issues and possibly providing input about their specific use cases. However, realistically speaking, significant developments seem unlikely due to the lack of recent activity.

If you desire a different display format for your type, it may be necessary to adjust it accordingly. Since `GetKeyOf` appears to generate key-like types (potentially a subset of `string | number | symbol`) excluding nullish values, one approach could involve intersecting that type with an empty object `{}`. This action typically prompts the compiler to conduct a more thorough evaluation when presenting the type:

type A = (GetKeyOf<EmitterMasterEventMap> & {})[];
// type A = (string | number)[]

For experimentation purposes, you can test out this concept using the TypeScript Playground at this link.

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