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Wilhelmina Lohan
Wilhelmina Lohan

Reputation: 3043

Typescript Pick type not mapping intellisense

The Typescript Pick type is not mapping intellisense in vscode (or stackblitz). If MyType has a documented property, then you define a type as Pick<MyType, 'someProperty'>, then you mouseover .someProperty you won't see the documentation or if you right-click -> Go to Definition it won't find any. It will for Partial<MyType> though.

I made workaround type PickPartial<T, K extends keyof T> and demonstration here. Is this a Typescript or vscode bug or how Pick should behave?

Upvotes: 1

Views: 798

Answers (1)

Matt McCutchen
Matt McCutchen

Reputation: 30919

I'm going to call this a TypeScript bug. See this modified demo. In order for the documentation to come through, the constraint of the mapped type has to be just a keyof; this was implemented here. However, modifiers such as readonly come through if the constraint is a type parameter whose constraint is a keyof, as it is in Pick. Documentation should be changed to come through in the same circumstances that modifiers do.

Upvotes: 2

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