Intellisense in Typescript does not provide mapping for the Pick type

The Typescript Pick type is not displaying intellisense mappings in vscode (or stackblitz). When using 

Pick<MyType, 'someProperty'>
to define a type with a documented property of MyType, hovering over or trying to navigate to the definition of `.someProperty` does not show any documentation. However, this works fine for Partial<MyType>.

To address this issue, I created a workaround type called 

PickPartial<T, K extends keyof T>
and provided a demonstration here. Is this a bug within Typescript or vscode, or is this the intended behavior of the Pick type?

typescriptvisual-studio-code

Answer №1

This issue appears to be a bug with TypeScript. You can view a modified demo showcasing the problem. The documentation only comes through when the constraint of the mapped type is just a keyof, as discussed in this issue thread. However, modifiers like readonly are included if the constraint is a type parameter whose constraint is a keyof, as seen with the Pick type. It would be beneficial for the documentation to be consistent and come through in all relevant circumstances.

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