Add NoInfer intrinsic type

[Mateusz Burzyński (Andarist)]

closes#14829

There is still some work to be done here (type displays on hover, assignability bug, and maybe more) - but I'm pushing this out to receive an early feedback

cc Ryan Cavanaugh (@RyanCavanaugh)

[TypeScript Bot (typescript-bot)]

The TypeScript team hasn't accepted the linked issue #14829. If you can get it accepted, this PR will have a better chance of being reviewed.

[Nathan Shively-Sanders (sandersn)]

Mateusz Burzyński (@Andarist) did you learn anything interesting from the implementation? If so, can you add a report to the end of #14829? Unless Daniel Rosenwasser (@DanielRosenwasser)Ryan Cavanaugh (@RyanCavanaugh) or Anders Hejlsberg (@ahejlsberg) are interested in taking up this feature in a design meeting, it's likely that this PR will sit until it gets stale.

[Mateusz Burzyński (Andarist)]

Jake Bailey (@jakebailey) would you mind creating a playground for this? :)

[Jake Bailey (jakebailey)]

TypeScript Bot (@typescript-bot) pack this

[TypeScript Bot (typescript-bot)]

Heya Jake Bailey (@jakebailey), I've started to run the tarball bundle task on this PR at 86448ff. You can monitor the build here.

[TypeScript Bot (typescript-bot)]

Hey Jake Bailey (@jakebailey), I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
"devDependencies": {
"typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/149238/artifacts?artifactName=tgz&fileId=E040D91AAAB70FE622A8C39FD6DF27B76C392A7C8C3B48C212D760AAF66AFD4702&fileName=/typescript-5.1.0-insiders.20230313.tgz"
}
}

and then running npm install.

---

There is also a playground for this build and an npm module you can use via "typescript": "npm:@typescript-deploys/pr-build@5.1.0-pr-52968-5".;

[Homa Wong (unional)]

Hi, I am reading #14829 and trying to add NoInfer<T> to fix the stub() function in type-plus.

An I notice the type type NoInfer<T> = T & { [K in keyof T]: T[K] } there works with the Animal|Dog example but does not work with:

typeNoInfer<T>=T&{[KinkeyofT]: T[K]}typeRecursivePartial<T>={[PinkeyofT]?: T[P]extends(infer U)[]
? RecursivePartial<U>[]
: T[P]extendsRecord<any,any>
? RecursivePartial<T[P]>
: T[P]}functionfoo(v: {a: number,b: string}){}functionstub<T>(v: RecursivePartial<NoInfer<T>>): T{returnvasT}foo(stub({a: 1})// error// Argument of type '{ a: number; }' is not assignable to parameter of type '{ a: number; b: string; }'.// Property 'b' is missing in type '{ a: number; }' but required in type '{ a: number; b: string; }'.

It works with the following type: type NoInfer<T> = Or<IsNull<T>, IsUndefined<T>, T, T & {}>
(where Or<A,B,Then,Else>, IsNull<T>, IsUndefined<T> does what their name suggest).

Just want to bring it up so that this test case is covered in your implementation.
🌷

[Mateusz Burzyński (Andarist)]

Ryan Cavanaugh (@RyanCavanaugh) Since 5.2 development has started recently - perhaps we could get some current thoughts from the team about this feature? 😉

[Andrew Branch (andrewbranch)]

TypeScript Bot (@typescript-bot) pack this

[TypeScript Bot (typescript-bot)]

Looks like you're introducing a change to the public API surface area. If this includes breaking changes, please document them on our wiki's API Breaking Changes page.

Also, please make sure Daniel Rosenwasser (@DanielRosenwasser) and Ryan Cavanaugh (@RyanCavanaugh) are aware of the changes, just as a heads up.

[TypeScript Bot (typescript-bot)]

Heya Andrew Branch (@andrewbranch), I've started to run the tarball bundle task on this PR at 989fa50. You can monitor the build here.

[TypeScript Bot (typescript-bot)]

Hey Andrew Branch (@andrewbranch), I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
"devDependencies": {
"typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/158991/artifacts?artifactName=tgz&fileId=95BBFD2778E2B6F0853A6F2EF1EAB1A4AF470C0AB105BAD2C44C6707C2F2A1D302&fileName=/typescript-5.4.0-insiders.20231207.tgz"
}
}

and then running npm install.

---

There is also a playground for this build and an npm module you can use via "typescript": "npm:@typescript-deploys/pr-build@5.4.0-pr-52968-11".;

[Mateusz Burzyński (Andarist)]

superseded by #56794