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Fix isGenericReducibleType to allow HKT technique to function again #54112

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merged 4 commits into from May 20, 2023
Merged

Fix isGenericReducibleType to allow HKT technique to function again #54112

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33aeffb
Improve type inference to allow HKT technique function again
ahejlsberg May 3, 2023
dd88229
Add regression test
ahejlsberg May 3, 2023
f104b53
Revert changes and instead fix isGenericObjectType to be more conserv…
ahejlsberg May 4, 2023
64a864b
Accept new baselines
ahejlsberg May 4, 2023
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2 changes: 1 addition & 1 deletion src/compiler/checker.ts
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Expand Up @@ -14078,7 +14078,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
else if (type !== firstType) {
checkFlags |= CheckFlags.HasNonUniformType;
}
if (isLiteralType(type) || isPatternLiteralType(type) || type === uniqueLiteralType) {
if (isLiteralType(type) || isPatternLiteralType(type)) {
checkFlags |= CheckFlags.HasLiteralType;
}
if (type.flags & TypeFlags.Never && type !== uniqueLiteralType) {
Expand Down
100 changes: 100 additions & 0 deletions tests/baselines/reference/inferenceAndHKTs.symbols
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@@ -0,0 +1,100 @@
=== tests/cases/compiler/inferenceAndHKTs.ts ===
// Repro from #53970

export interface TypeLambda {
>TypeLambda : Symbol(TypeLambda, Decl(inferenceAndHKTs.ts, 0, 0))

readonly A: unknown;
>A : Symbol(TypeLambda.A, Decl(inferenceAndHKTs.ts, 2, 29))
}

export interface TypeClass<F extends TypeLambda> {
>TypeClass : Symbol(TypeClass, Decl(inferenceAndHKTs.ts, 4, 1))
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 6, 27))
>TypeLambda : Symbol(TypeLambda, Decl(inferenceAndHKTs.ts, 0, 0))

readonly _F: F;
>_F : Symbol(TypeClass._F, Decl(inferenceAndHKTs.ts, 6, 50))
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 6, 27))
}

export type Apply<F extends TypeLambda, A> = F extends { readonly type: unknown }
>Apply : Symbol(Apply, Decl(inferenceAndHKTs.ts, 8, 1))
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 10, 18))
>TypeLambda : Symbol(TypeLambda, Decl(inferenceAndHKTs.ts, 0, 0))
>A : Symbol(A, Decl(inferenceAndHKTs.ts, 10, 39))
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 10, 18))
>type : Symbol(type, Decl(inferenceAndHKTs.ts, 10, 56))

? (F & { readonly A: A })['type']
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 10, 18))
>A : Symbol(A, Decl(inferenceAndHKTs.ts, 11, 12))
>A : Symbol(A, Decl(inferenceAndHKTs.ts, 10, 39))

: { readonly F: F, readonly A: A };
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 12, 7))
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 10, 18))
>A : Symbol(A, Decl(inferenceAndHKTs.ts, 12, 22))
>A : Symbol(A, Decl(inferenceAndHKTs.ts, 10, 39))

export interface T<A> {
>T : Symbol(T, Decl(inferenceAndHKTs.ts, 12, 39))
>A : Symbol(A, Decl(inferenceAndHKTs.ts, 14, 19))

value: A;
>value : Symbol(T.value, Decl(inferenceAndHKTs.ts, 14, 23))
>A : Symbol(A, Decl(inferenceAndHKTs.ts, 14, 19))
}

export interface TTypeLambda extends TypeLambda {
>TTypeLambda : Symbol(TTypeLambda, Decl(inferenceAndHKTs.ts, 16, 1))
>TypeLambda : Symbol(TypeLambda, Decl(inferenceAndHKTs.ts, 0, 0))

readonly type: T<this["A"]>;
>type : Symbol(TTypeLambda.type, Decl(inferenceAndHKTs.ts, 18, 49))
>T : Symbol(T, Decl(inferenceAndHKTs.ts, 12, 39))
}

export declare const map: <F extends TypeLambda>(F: TypeClass<F>) => <A, B>(a: Apply<F, A>, f: (a: A) => B) => Apply<F, B>;
>map : Symbol(map, Decl(inferenceAndHKTs.ts, 22, 20))
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 22, 27), Decl(inferenceAndHKTs.ts, 22, 49))
>TypeLambda : Symbol(TypeLambda, Decl(inferenceAndHKTs.ts, 0, 0))
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 22, 27), Decl(inferenceAndHKTs.ts, 22, 49))
>TypeClass : Symbol(TypeClass, Decl(inferenceAndHKTs.ts, 4, 1))
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 22, 27), Decl(inferenceAndHKTs.ts, 22, 49))
>A : Symbol(A, Decl(inferenceAndHKTs.ts, 22, 70))
>B : Symbol(B, Decl(inferenceAndHKTs.ts, 22, 72))
>a : Symbol(a, Decl(inferenceAndHKTs.ts, 22, 76))
>Apply : Symbol(Apply, Decl(inferenceAndHKTs.ts, 8, 1))
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 22, 27), Decl(inferenceAndHKTs.ts, 22, 49))
>A : Symbol(A, Decl(inferenceAndHKTs.ts, 22, 70))
>f : Symbol(f, Decl(inferenceAndHKTs.ts, 22, 91))
>a : Symbol(a, Decl(inferenceAndHKTs.ts, 22, 96))
>A : Symbol(A, Decl(inferenceAndHKTs.ts, 22, 70))
>B : Symbol(B, Decl(inferenceAndHKTs.ts, 22, 72))
>Apply : Symbol(Apply, Decl(inferenceAndHKTs.ts, 8, 1))
>F : Symbol(F, Decl(inferenceAndHKTs.ts, 22, 27), Decl(inferenceAndHKTs.ts, 22, 49))
>B : Symbol(B, Decl(inferenceAndHKTs.ts, 22, 72))

declare const typeClass: TypeClass<TTypeLambda>;
>typeClass : Symbol(typeClass, Decl(inferenceAndHKTs.ts, 24, 13))
>TypeClass : Symbol(TypeClass, Decl(inferenceAndHKTs.ts, 4, 1))
>TTypeLambda : Symbol(TTypeLambda, Decl(inferenceAndHKTs.ts, 16, 1))

declare const a: T<number>;
>a : Symbol(a, Decl(inferenceAndHKTs.ts, 26, 13))
>T : Symbol(T, Decl(inferenceAndHKTs.ts, 12, 39))

const x1 = map(typeClass);
>x1 : Symbol(x1, Decl(inferenceAndHKTs.ts, 28, 5))
>map : Symbol(map, Decl(inferenceAndHKTs.ts, 22, 20))
>typeClass : Symbol(typeClass, Decl(inferenceAndHKTs.ts, 24, 13))

const x2 = map(typeClass)(a, (_) => _); // T<number>
>x2 : Symbol(x2, Decl(inferenceAndHKTs.ts, 29, 5))
>map : Symbol(map, Decl(inferenceAndHKTs.ts, 22, 20))
>typeClass : Symbol(typeClass, Decl(inferenceAndHKTs.ts, 24, 13))
>a : Symbol(a, Decl(inferenceAndHKTs.ts, 26, 13))
>_ : Symbol(_, Decl(inferenceAndHKTs.ts, 29, 30))
>_ : Symbol(_, Decl(inferenceAndHKTs.ts, 29, 30))

64 changes: 64 additions & 0 deletions tests/baselines/reference/inferenceAndHKTs.types
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@@ -0,0 +1,64 @@
=== tests/cases/compiler/inferenceAndHKTs.ts ===
// Repro from #53970

export interface TypeLambda {
readonly A: unknown;
>A : unknown
}

export interface TypeClass<F extends TypeLambda> {
readonly _F: F;
>_F : F
}

export type Apply<F extends TypeLambda, A> = F extends { readonly type: unknown }
>Apply : Apply<F, A>
>type : unknown

? (F & { readonly A: A })['type']
>A : A

: { readonly F: F, readonly A: A };
>F : F
>A : A

export interface T<A> {
value: A;
>value : A
}

export interface TTypeLambda extends TypeLambda {
readonly type: T<this["A"]>;
>type : T<this["A"]>
}

export declare const map: <F extends TypeLambda>(F: TypeClass<F>) => <A, B>(a: Apply<F, A>, f: (a: A) => B) => Apply<F, B>;
>map : <F extends TypeLambda>(F: TypeClass<F>) => <A, B>(a: Apply<F, A>, f: (a: A) => B) => Apply<F, B>
>F : TypeClass<F>
>a : Apply<F, A>
>f : (a: A) => B
>a : A

declare const typeClass: TypeClass<TTypeLambda>;
>typeClass : TypeClass<TTypeLambda>

declare const a: T<number>;
>a : T<number>

const x1 = map(typeClass);
>x1 : <A, B>(a: T<A>, f: (a: A) => B) => T<B>
>map(typeClass) : <A, B>(a: T<A>, f: (a: A) => B) => T<B>
>map : <F extends TypeLambda>(F: TypeClass<F>) => <A, B>(a: Apply<F, A>, f: (a: A) => B) => Apply<F, B>
>typeClass : TypeClass<TTypeLambda>

const x2 = map(typeClass)(a, (_) => _); // T<number>
>x2 : T<number>
>map(typeClass)(a, (_) => _) : T<number>
>map(typeClass) : <A, B>(a: T<A>, f: (a: A) => B) => T<B>
>map : <F extends TypeLambda>(F: TypeClass<F>) => <A, B>(a: Apply<F, A>, f: (a: A) => B) => Apply<F, B>
>typeClass : TypeClass<TTypeLambda>
>a : T<number>
>(_) => _ : (_: number) => number
>_ : number
>_ : number

33 changes: 33 additions & 0 deletions tests/cases/compiler/inferenceAndHKTs.ts
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@@ -0,0 +1,33 @@
// @strict: true
// @noEmit: true

// Repro from #53970

export interface TypeLambda {
readonly A: unknown;
}

export interface TypeClass<F extends TypeLambda> {
readonly _F: F;
}

export type Apply<F extends TypeLambda, A> = F extends { readonly type: unknown }
? (F & { readonly A: A })['type']
: { readonly F: F, readonly A: A };

export interface T<A> {
value: A;
}

export interface TTypeLambda extends TypeLambda {
readonly type: T<this["A"]>;
}

export declare const map: <F extends TypeLambda>(F: TypeClass<F>) => <A, B>(a: Apply<F, A>, f: (a: A) => B) => Apply<F, B>;

declare const typeClass: TypeClass<TTypeLambda>;

declare const a: T<number>;

const x1 = map(typeClass);
const x2 = map(typeClass)(a, (_) => _); // T<number>