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Add an extra test case for an aliased mapped type inference #52742

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merged 1 commit into from
Mar 1, 2023
Merged

Add an extra test case for an aliased mapped type inference #52742

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52 changes: 52 additions & 0 deletions tests/baselines/reference/mappedTypeInferenceAliasSubstitution.symbols
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Original file line number Diff line number Diff line change
@@ -0,0 +1,52 @@
=== tests/cases/compiler/mappedTypeInferenceAliasSubstitution.ts ===
// repro from #31616

const v = { test: { smth: 5 } };
>v : Symbol(v, Decl(mappedTypeInferenceAliasSubstitution.ts, 2, 5))
>test : Symbol(test, Decl(mappedTypeInferenceAliasSubstitution.ts, 2, 11))
>smth : Symbol(smth, Decl(mappedTypeInferenceAliasSubstitution.ts, 2, 19))

type Field<A extends string, R> = { [K in A]: R }
>Field : Symbol(Field, Decl(mappedTypeInferenceAliasSubstitution.ts, 2, 32))
>A : Symbol(A, Decl(mappedTypeInferenceAliasSubstitution.ts, 4, 11))
>R : Symbol(R, Decl(mappedTypeInferenceAliasSubstitution.ts, 4, 28))
>K : Symbol(K, Decl(mappedTypeInferenceAliasSubstitution.ts, 4, 37))
>A : Symbol(A, Decl(mappedTypeInferenceAliasSubstitution.ts, 4, 11))
>R : Symbol(R, Decl(mappedTypeInferenceAliasSubstitution.ts, 4, 28))

const f = <A extends string, B extends string, R>(x: { [K in A]: Field<B, R> }): R => ({} as any);
>f : Symbol(f, Decl(mappedTypeInferenceAliasSubstitution.ts, 6, 5))
>A : Symbol(A, Decl(mappedTypeInferenceAliasSubstitution.ts, 6, 11))
>B : Symbol(B, Decl(mappedTypeInferenceAliasSubstitution.ts, 6, 28))
>R : Symbol(R, Decl(mappedTypeInferenceAliasSubstitution.ts, 6, 46))
>x : Symbol(x, Decl(mappedTypeInferenceAliasSubstitution.ts, 6, 50))
>K : Symbol(K, Decl(mappedTypeInferenceAliasSubstitution.ts, 6, 56))
>A : Symbol(A, Decl(mappedTypeInferenceAliasSubstitution.ts, 6, 11))
>Field : Symbol(Field, Decl(mappedTypeInferenceAliasSubstitution.ts, 2, 32))
>B : Symbol(B, Decl(mappedTypeInferenceAliasSubstitution.ts, 6, 28))
>R : Symbol(R, Decl(mappedTypeInferenceAliasSubstitution.ts, 6, 46))
>R : Symbol(R, Decl(mappedTypeInferenceAliasSubstitution.ts, 6, 46))

const r1 = f(v);
>r1 : Symbol(r1, Decl(mappedTypeInferenceAliasSubstitution.ts, 7, 5))
>f : Symbol(f, Decl(mappedTypeInferenceAliasSubstitution.ts, 6, 5))
>v : Symbol(v, Decl(mappedTypeInferenceAliasSubstitution.ts, 2, 5))

const g = <A extends string, B extends string, R>(x: Field<A, Field<B, R>>): R => ({} as any);
>g : Symbol(g, Decl(mappedTypeInferenceAliasSubstitution.ts, 9, 5))
>A : Symbol(A, Decl(mappedTypeInferenceAliasSubstitution.ts, 9, 11))
>B : Symbol(B, Decl(mappedTypeInferenceAliasSubstitution.ts, 9, 28))
>R : Symbol(R, Decl(mappedTypeInferenceAliasSubstitution.ts, 9, 46))
>x : Symbol(x, Decl(mappedTypeInferenceAliasSubstitution.ts, 9, 50))
>Field : Symbol(Field, Decl(mappedTypeInferenceAliasSubstitution.ts, 2, 32))
>A : Symbol(A, Decl(mappedTypeInferenceAliasSubstitution.ts, 9, 11))
>Field : Symbol(Field, Decl(mappedTypeInferenceAliasSubstitution.ts, 2, 32))
>B : Symbol(B, Decl(mappedTypeInferenceAliasSubstitution.ts, 9, 28))
>R : Symbol(R, Decl(mappedTypeInferenceAliasSubstitution.ts, 9, 46))
>R : Symbol(R, Decl(mappedTypeInferenceAliasSubstitution.ts, 9, 46))

const r2 = g(v);
>r2 : Symbol(r2, Decl(mappedTypeInferenceAliasSubstitution.ts, 10, 5))
>g : Symbol(g, Decl(mappedTypeInferenceAliasSubstitution.ts, 9, 5))
>v : Symbol(v, Decl(mappedTypeInferenceAliasSubstitution.ts, 2, 5))

42 changes: 42 additions & 0 deletions tests/baselines/reference/mappedTypeInferenceAliasSubstitution.types
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Original file line number Diff line number Diff line change
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=== tests/cases/compiler/mappedTypeInferenceAliasSubstitution.ts ===
// repro from #31616

const v = { test: { smth: 5 } };
>v : { test: { smth: number; }; }
>{ test: { smth: 5 } } : { test: { smth: number; }; }
>test : { smth: number; }
>{ smth: 5 } : { smth: number; }
>smth : number
>5 : 5

type Field<A extends string, R> = { [K in A]: R }
>Field : Field<A, R>

const f = <A extends string, B extends string, R>(x: { [K in A]: Field<B, R> }): R => ({} as any);
>f : <A extends string, B extends string, R>(x: { [K in A]: Field<B, R>; }) => R
><A extends string, B extends string, R>(x: { [K in A]: Field<B, R> }): R => ({} as any) : <A extends string, B extends string, R>(x: { [K in A]: Field<B, R>; }) => R
>x : { [K in A]: Field<B, R>; }
>({} as any) : any
>{} as any : any
>{} : {}

const r1 = f(v);
>r1 : number
>f(v) : number
>f : <A extends string, B extends string, R>(x: { [K in A]: Field<B, R>; }) => R
>v : { test: { smth: number; }; }

const g = <A extends string, B extends string, R>(x: Field<A, Field<B, R>>): R => ({} as any);
>g : <A extends string, B extends string, R>(x: Field<A, Field<B, R>>) => R
><A extends string, B extends string, R>(x: Field<A, Field<B, R>>): R => ({} as any) : <A extends string, B extends string, R>(x: Field<A, Field<B, R>>) => R
>x : Field<A, Field<B, R>>
>({} as any) : any
>{} as any : any
>{} : {}

const r2 = g(v);
>r2 : number
>g(v) : number
>g : <A extends string, B extends string, R>(x: Field<A, Field<B, R>>) => R
>v : { test: { smth: number; }; }

14 changes: 14 additions & 0 deletions tests/cases/compiler/mappedTypeInferenceAliasSubstitution.ts
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// @strict: true
// @noEmit: true

// repro from #31616

const v = { test: { smth: 5 } };

type Field<A extends string, R> = { [K in A]: R }

const f = <A extends string, B extends string, R>(x: { [K in A]: Field<B, R> }): R => ({} as any);
const r1 = f(v);

const g = <A extends string, B extends string, R>(x: Field<A, Field<B, R>>): R => ({} as any);
const r2 = g(v);