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Make enum literal type identical to the union of its values #60417

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Make enum literal type identical to the union of its values #60417

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9c4a49f
Make enum literal type identical to the union of its values
Nov 4, 2024
dbf699a
Update implementation to use normalization
Nov 5, 2024
4ce1010
Update test to not have namespace conflicts with future tests
Nov 5, 2024
8718eca
Accept new baselines
Nov 5, 2024
79a33d5
Normalize in the opposite direction
Nov 11, 2024
52885f2
Merge remote-tracking branch 'origin/main' into identical_enum_types
Nov 11, 2024
8ca6e3b
make formatter check happy
Nov 11, 2024
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1 change: 1 addition & 0 deletions src/compiler/checker.ts
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Expand Up @@ -21573,6 +21573,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
const t = isFreshLiteralType(type) ? (type as FreshableType).regularType :
isGenericTupleType(type) ? getNormalizedTupleType(type, writing) :
getObjectFlags(type) & ObjectFlags.Reference ? (type as TypeReference).node ? createTypeReference((type as TypeReference).target, getTypeArguments(type as TypeReference)) : getSingleBaseForNonAugmentingSubtype(type) || type :
type.flags & TypeFlags.EnumLiteral && type.flags & TypeFlags.Union ? getUnionType((type as UnionType).types) :
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type.flags & TypeFlags.UnionOrIntersection ? getNormalizedUnionOrIntersectionType(type as UnionOrIntersectionType, writing) :
type.flags & TypeFlags.Substitution ? writing ? (type as SubstitutionType).baseType : getSubstitutionIntersection(type as SubstitutionType) :
type.flags & TypeFlags.Simplifiable ? getSimplifiedType(type, writing) :
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42 changes: 42 additions & 0 deletions tests/baselines/reference/identityRelationEnumTypes.js
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@@ -0,0 +1,42 @@
//// [tests/cases/compiler/identityRelationEnumTypes.ts] ////

//// [identityRelationEnumTypes.ts]
namespace identityRelationEnumTypes {
export type Equals<A, B> = (<T>() => T extends B ? 1 : 0) extends (<T>() => T extends A ? 1 : 0) ? true : false;

export enum Enum {
A = 'a',
B = 'b',
}

export type EnumValues = typeof Enum[keyof typeof Enum];
}

type Result = identityRelationEnumTypes.Equals<
identityRelationEnumTypes.Enum,
identityRelationEnumTypes.EnumValues
>; // true


//// [identityRelationEnumTypes.js]
"use strict";
var identityRelationEnumTypes;
(function (identityRelationEnumTypes) {
var Enum;
(function (Enum) {
Enum["A"] = "a";
Enum["B"] = "b";
})(Enum = identityRelationEnumTypes.Enum || (identityRelationEnumTypes.Enum = {}));
})(identityRelationEnumTypes || (identityRelationEnumTypes = {}));


//// [identityRelationEnumTypes.d.ts]
declare namespace identityRelationEnumTypes {
type Equals<A, B> = (<T>() => T extends B ? 1 : 0) extends (<T>() => T extends A ? 1 : 0) ? true : false;
enum Enum {
A = "a",
B = "b"
}
type EnumValues = typeof Enum[keyof typeof Enum];
}
type Result = identityRelationEnumTypes.Equals<identityRelationEnumTypes.Enum, identityRelationEnumTypes.EnumValues>;
48 changes: 48 additions & 0 deletions tests/baselines/reference/identityRelationEnumTypes.symbols
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//// [tests/cases/compiler/identityRelationEnumTypes.ts] ////

=== identityRelationEnumTypes.ts ===
namespace identityRelationEnumTypes {
>identityRelationEnumTypes : Symbol(identityRelationEnumTypes, Decl(identityRelationEnumTypes.ts, 0, 0))

export type Equals<A, B> = (<T>() => T extends B ? 1 : 0) extends (<T>() => T extends A ? 1 : 0) ? true : false;
>Equals : Symbol(Equals, Decl(identityRelationEnumTypes.ts, 0, 37))
>A : Symbol(A, Decl(identityRelationEnumTypes.ts, 1, 23))
>B : Symbol(B, Decl(identityRelationEnumTypes.ts, 1, 25))
>T : Symbol(T, Decl(identityRelationEnumTypes.ts, 1, 33))
>T : Symbol(T, Decl(identityRelationEnumTypes.ts, 1, 33))
>B : Symbol(B, Decl(identityRelationEnumTypes.ts, 1, 25))
>T : Symbol(T, Decl(identityRelationEnumTypes.ts, 1, 72))
>T : Symbol(T, Decl(identityRelationEnumTypes.ts, 1, 72))
>A : Symbol(A, Decl(identityRelationEnumTypes.ts, 1, 23))

export enum Enum {
>Enum : Symbol(Enum, Decl(identityRelationEnumTypes.ts, 1, 116))

A = 'a',
>A : Symbol(Enum.A, Decl(identityRelationEnumTypes.ts, 3, 22))

B = 'b',
>B : Symbol(Enum.B, Decl(identityRelationEnumTypes.ts, 4, 16))
}

export type EnumValues = typeof Enum[keyof typeof Enum];
>EnumValues : Symbol(EnumValues, Decl(identityRelationEnumTypes.ts, 6, 5))
>Enum : Symbol(Enum, Decl(identityRelationEnumTypes.ts, 1, 116))
>Enum : Symbol(Enum, Decl(identityRelationEnumTypes.ts, 1, 116))
}

type Result = identityRelationEnumTypes.Equals<
>Result : Symbol(Result, Decl(identityRelationEnumTypes.ts, 9, 1))
>identityRelationEnumTypes : Symbol(identityRelationEnumTypes, Decl(identityRelationEnumTypes.ts, 0, 0))
>Equals : Symbol(identityRelationEnumTypes.Equals, Decl(identityRelationEnumTypes.ts, 0, 37))

identityRelationEnumTypes.Enum,
>identityRelationEnumTypes : Symbol(identityRelationEnumTypes, Decl(identityRelationEnumTypes.ts, 0, 0))
>Enum : Symbol(identityRelationEnumTypes.Enum, Decl(identityRelationEnumTypes.ts, 1, 116))

identityRelationEnumTypes.EnumValues
>identityRelationEnumTypes : Symbol(identityRelationEnumTypes, Decl(identityRelationEnumTypes.ts, 0, 0))
>EnumValues : Symbol(identityRelationEnumTypes.EnumValues, Decl(identityRelationEnumTypes.ts, 6, 5))

>; // true

57 changes: 57 additions & 0 deletions tests/baselines/reference/identityRelationEnumTypes.types
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//// [tests/cases/compiler/identityRelationEnumTypes.ts] ////

=== identityRelationEnumTypes.ts ===
namespace identityRelationEnumTypes {
>identityRelationEnumTypes : typeof identityRelationEnumTypes
> : ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

export type Equals<A, B> = (<T>() => T extends B ? 1 : 0) extends (<T>() => T extends A ? 1 : 0) ? true : false;
>Equals : Equals<A, B>
> : ^^^^^^^^^^^^
>true : true
> : ^^^^
>false : false
> : ^^^^^

export enum Enum {
>Enum : Enum
> : ^^^^

A = 'a',
>A : Enum.A
> : ^^^^^^
>'a' : "a"
> : ^^^

B = 'b',
>B : Enum.B
> : ^^^^^^
>'b' : "b"
> : ^^^
}

export type EnumValues = typeof Enum[keyof typeof Enum];
>EnumValues : EnumValues
> : ^^^^^^^^^^
>Enum : typeof Enum
> : ^^^^^^^^^^^
>Enum : typeof Enum
> : ^^^^^^^^^^^
}

type Result = identityRelationEnumTypes.Equals<
>Result : true
> : ^^^^
>identityRelationEnumTypes : any
> : ^^^

identityRelationEnumTypes.Enum,
>identityRelationEnumTypes : any
> : ^^^

identityRelationEnumTypes.EnumValues
>identityRelationEnumTypes : any
> : ^^^

>; // true

18 changes: 18 additions & 0 deletions tests/cases/compiler/identityRelationEnumTypes.ts
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// @strict: true
// @declaration: true

namespace identityRelationEnumTypes {
export type Equals<A, B> = (<T>() => T extends B ? 1 : 0) extends (<T>() => T extends A ? 1 : 0) ? true : false;

export enum Enum {
A = 'a',
B = 'b',
}

export type EnumValues = typeof Enum[keyof typeof Enum];
}

type Result = identityRelationEnumTypes.Equals<
identityRelationEnumTypes.Enum,
identityRelationEnumTypes.EnumValues
>; // true
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