infer in docs in 2.8 release notes

[guyellis]

TypeScript Version: 3.6.4

Docs

https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-8.html

About half way through the above release-notes:

type Bar<T> = T extends { a: (x: infer U) => void, b: (x: infer U) => void } ? U : never;
type T20 = Bar<{ a: (x: string) => void, b: (x: string) => void }>;  // string
type T21 = Bar<{ a: (x: string) => void, b: (x: number) => void }>;  // string & number

T21 is never with tsc 3.6.4 but with 2.8 it is string & number. Would be great if that doc had a link to the updated functionality or noted that it's changed.

[RyanCavanaugh]

I think it would be weird to backport changes to release notes - these are effectively historical documents and should be kept as-is absent concrete errors.

[guyellis]

@RyanCavanaugh - I understand and agree with the sentiment. Perhaps there's a better way to solve this. Is that information accurately available elsewhere in the official docs for the latest release of TypeScript? If so, how do we get readers from there to the latest docs or at least let them know that there could be changes since that was written and where these docs are?

For example, for this change, I can't find where this change is documented?

[typescript-bot]

This issue has been marked 'Working as Intended' and has seen no recent activity. It has been automatically closed for house-keeping purposes.