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Recursive conditional types #40002

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Merged
ahejlsberg merged 12 commits into from
Aug 16, 2020
Merged

Recursive conditional types #40002

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419e8d6
Support recursive conditional types
ahejlsberg Aug 8, 2020
beab30a
Accept new API baselines
ahejlsberg Aug 8, 2020
c24cacc
Accept new baselines
ahejlsberg Aug 8, 2020
5a45585
Simplify recursive type tracking in type inference
ahejlsberg Aug 10, 2020
4f8dc24
Accept new baselines
ahejlsberg Aug 10, 2020
dd64bf8
Add tests
ahejlsberg Aug 11, 2020
7c4d923
Accept new baselines
ahejlsberg Aug 11, 2020
6c11cf4
Revise recursion tracking in type inference
ahejlsberg Aug 13, 2020
5b45f42
Revise tests
ahejlsberg Aug 13, 2020
fed0e8c
Accept new baselines
ahejlsberg Aug 13, 2020
199d568
Add more tests
ahejlsberg Aug 16, 2020
324b3fb
Accept new baselines
ahejlsberg Aug 16, 2020
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Revise tests
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@ahejlsberg
ahejlsberg committed Aug 13, 2020
commit 5b45f42c79f9ef9b43ce024d0505b3cd8e07d2b5
4 changes: 2 additions & 2 deletions tests/cases/compiler/recursiveConditionalTypes.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ type Awaited<T> =
T;

type MyPromise<T> = {
then<U>(f: ((value: T) => U | MyPromise<U>) | null | undefined): MyPromise<U>;
then<U>(f: ((value: T) => U | PromiseLike<U>) | null | undefined): MyPromise<U>;
}

type InfinitePromise<T> = Promise<InfinitePromise<T>>;
Expand Down Expand Up @@ -66,7 +66,7 @@ declare function foo<T>(x: Box1<Box1<T>>): T;

declare let z: Box2<Box2<string>>;

foo(z); // string
foo(z); // unknown, but ideally would be string (requires unique recursion ID for each type reference)

// Intersect tuple element types

Expand Down