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Add numeric constraint to type parameter of mapped types with name type and array constraints (#55774)
1 parent bbef6a7 commit 3f8707d

17 files changed

+437
-224
lines changed

‎src/compiler/checker.ts

+10-2
Original file line numberDiff line numberDiff line change
@@ -13850,6 +13850,14 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
1385013850
}
1385113851

1385213852
function forEachMappedTypePropertyKeyTypeAndIndexSignatureKeyType(type: Type, include: TypeFlags, stringsOnly: boolean, cb: (keyType: Type) => void) {
13853+
if (isTupleType(type)) {
13854+
forEachType(getUnionType(getElementTypes(type).map((_, i) => getStringLiteralType("" + i))), cb);
13855+
return;
13856+
}
13857+
if (isArrayType(type)) {
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cb(numberType);
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return;
13860+
}
1385313861
for (const prop of getPropertiesOfType(type)) {
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cb(getLiteralTypeFromProperty(prop, include));
1385513863
}
@@ -16242,8 +16250,8 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
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}
1624316251
}
1624416252
// Given a homomorphic mapped type { [K in keyof T]: XXX }, where T is constrained to an array or tuple type, in the
16245-
// template type XXX, K has an added constraint of number | `${number}`.
16246-
else if (type.flags & TypeFlags.TypeParameter && parent.kind === SyntaxKind.MappedType && node === (parent as MappedTypeNode).type) {
16253+
// template type XXX, K has an added constraint of number | `${number}`. The same is added in the optional name type.
16254+
else if (type.flags & TypeFlags.TypeParameter && parent.kind === SyntaxKind.MappedType && (node === (parent as MappedTypeNode).type || node === (parent as MappedTypeNode).nameType)) {
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const mappedType = getTypeFromTypeNode(parent as TypeNode) as MappedType;
1624816256
if (getTypeParameterFromMappedType(mappedType) === getActualTypeVariable(type)) {
1624916257
const typeParameter = getHomomorphicTypeVariable(mappedType);

‎tests/baselines/reference/mappedTypeHomomorphicTupleInstantiationNameTypeKeys.symbols

+36
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@@ -0,0 +1,36 @@
1+
//// [tests/cases/compiler/mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts] ////
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=== mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts ===
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// https://github.com/microsoft/TypeScript/pull/55774#issuecomment-1813484949
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type Mapper<T> = {
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>Mapper : Symbol(Mapper, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 0, 0))
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>T : Symbol(T, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 2, 12))
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[K in keyof T as K]: T[K] extends NonNullable<T[K]> ? T[K] : never;
11+
>K : Symbol(K, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 3, 3))
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>T : Symbol(T, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 2, 12))
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>K : Symbol(K, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 3, 3))
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>T : Symbol(T, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 2, 12))
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>K : Symbol(K, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 3, 3))
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>NonNullable : Symbol(NonNullable, Decl(lib.es5.d.ts, --, --))
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>T : Symbol(T, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 2, 12))
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>K : Symbol(K, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 3, 3))
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>T : Symbol(T, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 2, 12))
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>K : Symbol(K, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 3, 3))
21+
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};
23+
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type Mapped = Mapper<[1, 2]>;
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>Mapped : Symbol(Mapped, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 4, 2))
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>Mapper : Symbol(Mapper, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 0, 0))
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type Keys = keyof Mapper<[1, 2]>;
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>Keys : Symbol(Keys, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 6, 29))
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>Mapper : Symbol(Mapper, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 0, 0))
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type SomeType = Mapped[Keys]; // ok
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>SomeType : Symbol(SomeType, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 7, 33))
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>Mapped : Symbol(Mapped, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 4, 2))
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>Keys : Symbol(Keys, Decl(mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts, 6, 29))
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‎tests/baselines/reference/mappedTypeHomomorphicTupleInstantiationNameTypeKeys.types

+20
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@@ -0,0 +1,20 @@
1+
//// [tests/cases/compiler/mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts] ////
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3+
=== mappedTypeHomomorphicTupleInstantiationNameTypeKeys.ts ===
4+
// https://github.com/microsoft/TypeScript/pull/55774#issuecomment-1813484949
5+
6+
type Mapper<T> = {
7+
>Mapper : Mapper<T>
8+
9+
[K in keyof T as K]: T[K] extends NonNullable<T[K]> ? T[K] : never;
10+
};
11+
12+
type Mapped = Mapper<[1, 2]>;
13+
>Mapped : Mapper<[1, 2]>
14+
15+
type Keys = keyof Mapper<[1, 2]>;
16+
>Keys : "0" | "1"
17+
18+
type SomeType = Mapped[Keys]; // ok
19+
>SomeType : 2 | 1
20+

‎tests/baselines/reference/mappedTypeTupleConstraintTypeParameterInNameType.symbols

+149
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@@ -0,0 +1,149 @@
1+
//// [tests/cases/compiler/mappedTypeTupleConstraintTypeParameterInNameType.ts] ////
2+
3+
=== mappedTypeTupleConstraintTypeParameterInNameType.ts ===
4+
// based on https://github.com/microsoft/TypeScript/issues/55762
5+
6+
declare class Decoder<T> {
7+
>Decoder : Symbol(Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 0, 0))
8+
>T : Symbol(T, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 2, 22))
9+
10+
decode(arrayBuffer: ArrayBuffer): T;
11+
>decode : Symbol(Decoder.decode, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 2, 26))
12+
>arrayBuffer : Symbol(arrayBuffer, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 3, 9))
13+
>ArrayBuffer : Symbol(ArrayBuffer, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
14+
>T : Symbol(T, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 2, 22))
15+
}
16+
17+
type ValueTypeOf<T extends Decoder<any>> = T extends Decoder<infer R>
18+
>ValueTypeOf : Symbol(ValueTypeOf, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 4, 1))
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>T : Symbol(T, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 6, 17))
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>Decoder : Symbol(Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 0, 0))
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>T : Symbol(T, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 6, 17))
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>Decoder : Symbol(Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 0, 0))
23+
>R : Symbol(R, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 6, 66))
24+
25+
? R
26+
>R : Symbol(R, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 6, 66))
27+
28+
: never;
29+
30+
type StructDescriptor = ReadonlyArray<
31+
>StructDescriptor : Symbol(StructDescriptor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 8, 10))
32+
>ReadonlyArray : Symbol(ReadonlyArray, Decl(lib.es5.d.ts, --, --))
33+
34+
readonly [key: string, type: Decoder<any>]
35+
>Decoder : Symbol(Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 0, 0))
36+
37+
>;
38+
39+
type StructTypeFor<Descriptor extends StructDescriptor> = {
40+
>StructTypeFor : Symbol(StructTypeFor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 12, 2))
41+
>Descriptor : Symbol(Descriptor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 14, 19))
42+
>StructDescriptor : Symbol(StructDescriptor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 8, 10))
43+
44+
[K in keyof Descriptor as Descriptor[K][0]]: ValueTypeOf<Descriptor[K][1]>;
45+
>K : Symbol(K, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 15, 3))
46+
>Descriptor : Symbol(Descriptor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 14, 19))
47+
>Descriptor : Symbol(Descriptor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 14, 19))
48+
>K : Symbol(K, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 15, 3))
49+
>ValueTypeOf : Symbol(ValueTypeOf, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 4, 1))
50+
>Descriptor : Symbol(Descriptor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 14, 19))
51+
>K : Symbol(K, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 15, 3))
52+
53+
};
54+
55+
class StructDecoder<const Descriptor extends StructDescriptor> extends Decoder<
56+
>StructDecoder : Symbol(StructDecoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 16, 2))
57+
>Descriptor : Symbol(Descriptor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 18, 20))
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>StructDescriptor : Symbol(StructDescriptor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 8, 10))
59+
>Decoder : Symbol(Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 0, 0))
60+
61+
StructTypeFor<Descriptor>
62+
>StructTypeFor : Symbol(StructTypeFor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 12, 2))
63+
>Descriptor : Symbol(Descriptor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 18, 20))
64+
65+
> {
66+
constructor(descriptor: Descriptor) {
67+
>descriptor : Symbol(descriptor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 21, 14))
68+
>Descriptor : Symbol(Descriptor, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 18, 20))
69+
70+
super();
71+
>super : Symbol(Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 0, 0))
72+
}
73+
}
74+
75+
declare const i32Decoder: Decoder<number>;
76+
>i32Decoder : Symbol(i32Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 26, 13))
77+
>Decoder : Symbol(Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 0, 0))
78+
79+
declare const i64Decoder: Decoder<bigint>;
80+
>i64Decoder : Symbol(i64Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 27, 13))
81+
>Decoder : Symbol(Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 0, 0))
82+
83+
const structDecoder1 = new StructDecoder([
84+
>structDecoder1 : Symbol(structDecoder1, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 29, 5))
85+
>StructDecoder : Symbol(StructDecoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 16, 2))
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["a", i32Decoder],
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>i32Decoder : Symbol(i32Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 26, 13))
89+
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["b", i64Decoder],
91+
>i64Decoder : Symbol(i64Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 27, 13))
92+
93+
]);
94+
95+
const struct1 = structDecoder1.decode(new ArrayBuffer(100));
96+
>struct1 : Symbol(struct1, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 34, 5))
97+
>structDecoder1.decode : Symbol(Decoder.decode, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 2, 26))
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>structDecoder1 : Symbol(structDecoder1, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 29, 5))
99+
>decode : Symbol(Decoder.decode, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 2, 26))
100+
>ArrayBuffer : Symbol(ArrayBuffer, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
101+
102+
const v1_1: number = struct1.a;
103+
>v1_1 : Symbol(v1_1, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 36, 5))
104+
>struct1.a : Symbol(a)
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>struct1 : Symbol(struct1, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 34, 5))
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>a : Symbol(a)
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108+
const v1_2: bigint = struct1.b;
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>v1_2 : Symbol(v1_2, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 37, 5))
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>struct1.b : Symbol(b)
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>struct1 : Symbol(struct1, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 34, 5))
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>b : Symbol(b)
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114+
declare const descriptor2: [["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]
115+
>descriptor2 : Symbol(descriptor2, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 39, 13))
116+
>Decoder : Symbol(Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 0, 0))
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>Decoder : Symbol(Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 0, 0))
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>Decoder : Symbol(Decoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 0, 0))
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120+
const structDecoder2 = new StructDecoder(descriptor2);
121+
>structDecoder2 : Symbol(structDecoder2, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 40, 5))
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>StructDecoder : Symbol(StructDecoder, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 16, 2))
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>descriptor2 : Symbol(descriptor2, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 39, 13))
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125+
const struct2 = structDecoder2.decode(new ArrayBuffer(100));
126+
>struct2 : Symbol(struct2, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 42, 5))
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>structDecoder2.decode : Symbol(Decoder.decode, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 2, 26))
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>structDecoder2 : Symbol(structDecoder2, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 40, 5))
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>decode : Symbol(Decoder.decode, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 2, 26))
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>ArrayBuffer : Symbol(ArrayBuffer, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
131+
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const v2_1: number = struct2.a;
133+
>v2_1 : Symbol(v2_1, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 44, 5))
134+
>struct2.a : Symbol(a)
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>struct2 : Symbol(struct2, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 42, 5))
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>a : Symbol(a)
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const v2_2: string = struct2.b;
139+
>v2_2 : Symbol(v2_2, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 45, 5))
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>struct2.b : Symbol(b)
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>struct2 : Symbol(struct2, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 42, 5))
142+
>b : Symbol(b)
143+
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const v2_3: bigint = struct2.c;
145+
>v2_3 : Symbol(v2_3, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 46, 5))
146+
>struct2.c : Symbol(c)
147+
>struct2 : Symbol(struct2, Decl(mappedTypeTupleConstraintTypeParameterInNameType.ts, 42, 5))
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>c : Symbol(c)
149+

‎tests/baselines/reference/mappedTypeTupleConstraintTypeParameterInNameType.types

+129
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@@ -0,0 +1,129 @@
1+
//// [tests/cases/compiler/mappedTypeTupleConstraintTypeParameterInNameType.ts] ////
2+
3+
=== mappedTypeTupleConstraintTypeParameterInNameType.ts ===
4+
// based on https://github.com/microsoft/TypeScript/issues/55762
5+
6+
declare class Decoder<T> {
7+
>Decoder : Decoder<T>
8+
9+
decode(arrayBuffer: ArrayBuffer): T;
10+
>decode : (arrayBuffer: ArrayBuffer) => T
11+
>arrayBuffer : ArrayBuffer
12+
}
13+
14+
type ValueTypeOf<T extends Decoder<any>> = T extends Decoder<infer R>
15+
>ValueTypeOf : ValueTypeOf<T>
16+
17+
? R
18+
: never;
19+
20+
type StructDescriptor = ReadonlyArray<
21+
>StructDescriptor : readonly (readonly [key: string, type: Decoder<any>])[]
22+
23+
readonly [key: string, type: Decoder<any>]
24+
>;
25+
26+
type StructTypeFor<Descriptor extends StructDescriptor> = {
27+
>StructTypeFor : StructTypeFor<Descriptor>
28+
29+
[K in keyof Descriptor as Descriptor[K][0]]: ValueTypeOf<Descriptor[K][1]>;
30+
};
31+
32+
class StructDecoder<const Descriptor extends StructDescriptor> extends Decoder<
33+
>StructDecoder : StructDecoder<Descriptor>
34+
>Decoder : Decoder<StructTypeFor<Descriptor>>
35+
36+
StructTypeFor<Descriptor>
37+
> {
38+
constructor(descriptor: Descriptor) {
39+
>descriptor : Descriptor
40+
41+
super();
42+
>super() : void
43+
>super : typeof Decoder
44+
}
45+
}
46+
47+
declare const i32Decoder: Decoder<number>;
48+
>i32Decoder : Decoder<number>
49+
50+
declare const i64Decoder: Decoder<bigint>;
51+
>i64Decoder : Decoder<bigint>
52+
53+
const structDecoder1 = new StructDecoder([
54+
>structDecoder1 : StructDecoder<readonly [readonly ["a", Decoder<number>], readonly ["b", Decoder<bigint>]]>
55+
>new StructDecoder([ ["a", i32Decoder], ["b", i64Decoder],]) : StructDecoder<readonly [readonly ["a", Decoder<number>], readonly ["b", Decoder<bigint>]]>
56+
>StructDecoder : typeof StructDecoder
57+
>[ ["a", i32Decoder], ["b", i64Decoder],] : [["a", Decoder<number>], ["b", Decoder<bigint>]]
58+
59+
["a", i32Decoder],
60+
>["a", i32Decoder] : ["a", Decoder<number>]
61+
>"a" : "a"
62+
>i32Decoder : Decoder<number>
63+
64+
["b", i64Decoder],
65+
>["b", i64Decoder] : ["b", Decoder<bigint>]
66+
>"b" : "b"
67+
>i64Decoder : Decoder<bigint>
68+
69+
]);
70+
71+
const struct1 = structDecoder1.decode(new ArrayBuffer(100));
72+
>struct1 : StructTypeFor<readonly [readonly ["a", Decoder<number>], readonly ["b", Decoder<bigint>]]>
73+
>structDecoder1.decode(new ArrayBuffer(100)) : StructTypeFor<readonly [readonly ["a", Decoder<number>], readonly ["b", Decoder<bigint>]]>
74+
>structDecoder1.decode : (arrayBuffer: ArrayBuffer) => StructTypeFor<readonly [readonly ["a", Decoder<number>], readonly ["b", Decoder<bigint>]]>
75+
>structDecoder1 : StructDecoder<readonly [readonly ["a", Decoder<number>], readonly ["b", Decoder<bigint>]]>
76+
>decode : (arrayBuffer: ArrayBuffer) => StructTypeFor<readonly [readonly ["a", Decoder<number>], readonly ["b", Decoder<bigint>]]>
77+
>new ArrayBuffer(100) : ArrayBuffer
78+
>ArrayBuffer : ArrayBufferConstructor
79+
>100 : 100
80+
81+
const v1_1: number = struct1.a;
82+
>v1_1 : number
83+
>struct1.a : number
84+
>struct1 : StructTypeFor<readonly [readonly ["a", Decoder<number>], readonly ["b", Decoder<bigint>]]>
85+
>a : number
86+
87+
const v1_2: bigint = struct1.b;
88+
>v1_2 : bigint
89+
>struct1.b : bigint
90+
>struct1 : StructTypeFor<readonly [readonly ["a", Decoder<number>], readonly ["b", Decoder<bigint>]]>
91+
>b : bigint
92+
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declare const descriptor2: [["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]
94+
>descriptor2 : [["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]
95+
96+
const structDecoder2 = new StructDecoder(descriptor2);
97+
>structDecoder2 : StructDecoder<[["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]>
98+
>new StructDecoder(descriptor2) : StructDecoder<[["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]>
99+
>StructDecoder : typeof StructDecoder
100+
>descriptor2 : [["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]
101+
102+
const struct2 = structDecoder2.decode(new ArrayBuffer(100));
103+
>struct2 : StructTypeFor<[["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]>
104+
>structDecoder2.decode(new ArrayBuffer(100)) : StructTypeFor<[["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]>
105+
>structDecoder2.decode : (arrayBuffer: ArrayBuffer) => StructTypeFor<[["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]>
106+
>structDecoder2 : StructDecoder<[["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]>
107+
>decode : (arrayBuffer: ArrayBuffer) => StructTypeFor<[["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]>
108+
>new ArrayBuffer(100) : ArrayBuffer
109+
>ArrayBuffer : ArrayBufferConstructor
110+
>100 : 100
111+
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const v2_1: number = struct2.a;
113+
>v2_1 : number
114+
>struct2.a : number
115+
>struct2 : StructTypeFor<[["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]>
116+
>a : number
117+
118+
const v2_2: string = struct2.b;
119+
>v2_2 : string
120+
>struct2.b : string
121+
>struct2 : StructTypeFor<[["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]>
122+
>b : string
123+
124+
const v2_3: bigint = struct2.c;
125+
>v2_3 : bigint
126+
>struct2.c : bigint
127+
>struct2 : StructTypeFor<[["a", Decoder<number>], ["b", Decoder<string>], ...["c", Decoder<bigint>][]]>
128+
>c : bigint
129+

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