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ahejlsbergahejlsberg
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Merge pull request microsoft#23806 from Microsoft/objectAndUnconstrainedTypeParameter
Unconstrained type variable not assignable to 'object'
2 parents 9f4abe2 + 0066b02 commit 3bfbe68

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6 files changed

+178
-9
lines changed

6 files changed

+178
-9
lines changed

‎src/compiler/checker.ts

+8-9
Original file line numberDiff line numberDiff line change
@@ -10716,19 +10716,18 @@ namespace ts {
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return result;
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}
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}
10719-
let constraint = getConstraintForRelation(<TypeParameter>source);
10720-
// A type variable with no constraint is not related to the non-primitive object type.
10721-
if (constraint || !(target.flags & TypeFlags.NonPrimitive)) {
10722-
if (!constraint || constraint.flags & TypeFlags.Any) {
10723-
constraint = emptyObjectType;
10724-
}
10725-
// Report constraint errors only if the constraint is not the empty object type
10726-
const reportConstraintErrors = reportErrors && constraint !== emptyObjectType;
10727-
if (result = isRelatedTo(constraint, target, reportConstraintErrors)) {
10719+
const constraint = getConstraintForRelation(<TypeParameter>source);
10720+
if (!constraint || constraint.flags & TypeFlags.Any) {
10721+
// A type variable with no constraint is not related to the non-primitive object type.
10722+
if (result = isRelatedTo(emptyObjectType, extractTypesOfKind(target, ~TypeFlags.NonPrimitive))) {
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errorInfo = saveErrorInfo;
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return result;
1073010725
}
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}
10727+
else if (result = isRelatedTo(constraint, target, reportErrors)) {
10728+
errorInfo = saveErrorInfo;
10729+
return result;
10730+
}
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}
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else if (source.flags & TypeFlags.Index) {
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if (result = isRelatedTo(keyofConstraintType, target, reportErrors)) {

‎tests/baselines/reference/nonPrimitiveAndTypeVariables.errors.txt

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@@ -0,0 +1,24 @@
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tests/cases/conformance/types/nonPrimitive/nonPrimitiveAndTypeVariables.ts(10,9): error TS2322: Type 'T' is not assignable to type 'object'.
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tests/cases/conformance/types/nonPrimitive/nonPrimitiveAndTypeVariables.ts(11,9): error TS2322: Type 'T' is not assignable to type 'object | U'.
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Type 'T' is not assignable to type 'U'.
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==== tests/cases/conformance/types/nonPrimitive/nonPrimitiveAndTypeVariables.ts (2 errors) ====
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// Repros from #23800
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type A<T, V> = { [P in keyof T]: T[P] extends V ? 1 : 0; };
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type B<T, V> = { [P in keyof T]: T[P] extends V | object ? 1 : 0; };
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let a: A<{ a: 0 | 1 }, 0> = { a: 0 };
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let b: B<{ a: 0 | 1 }, 0> = { a: 0 };
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function foo<T, U>(x: T) {
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let a: object = x; // Error
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~
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!!! error TS2322: Type 'T' is not assignable to type 'object'.
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let b: U | object = x; // Error
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~
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!!! error TS2322: Type 'T' is not assignable to type 'object | U'.
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!!! error TS2322: Type 'T' is not assignable to type 'U'.
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}
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‎tests/baselines/reference/nonPrimitiveAndTypeVariables.js

+24
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@@ -0,0 +1,24 @@
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//// [nonPrimitiveAndTypeVariables.ts]
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// Repros from #23800
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type A<T, V> = { [P in keyof T]: T[P] extends V ? 1 : 0; };
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type B<T, V> = { [P in keyof T]: T[P] extends V | object ? 1 : 0; };
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let a: A<{ a: 0 | 1 }, 0> = { a: 0 };
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let b: B<{ a: 0 | 1 }, 0> = { a: 0 };
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function foo<T, U>(x: T) {
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let a: object = x; // Error
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let b: U | object = x; // Error
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}
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//// [nonPrimitiveAndTypeVariables.js]
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"use strict";
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// Repros from #23800
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var a = { a: 0 };
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var b = { a: 0 };
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function foo(x) {
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var a = x; // Error
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var b = x; // Error
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}

‎tests/baselines/reference/nonPrimitiveAndTypeVariables.symbols

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@@ -0,0 +1,52 @@
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=== tests/cases/conformance/types/nonPrimitive/nonPrimitiveAndTypeVariables.ts ===
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// Repros from #23800
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type A<T, V> = { [P in keyof T]: T[P] extends V ? 1 : 0; };
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>A : Symbol(A, Decl(nonPrimitiveAndTypeVariables.ts, 0, 0))
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>T : Symbol(T, Decl(nonPrimitiveAndTypeVariables.ts, 2, 7))
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>V : Symbol(V, Decl(nonPrimitiveAndTypeVariables.ts, 2, 9))
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>P : Symbol(P, Decl(nonPrimitiveAndTypeVariables.ts, 2, 18))
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>T : Symbol(T, Decl(nonPrimitiveAndTypeVariables.ts, 2, 7))
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>T : Symbol(T, Decl(nonPrimitiveAndTypeVariables.ts, 2, 7))
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>P : Symbol(P, Decl(nonPrimitiveAndTypeVariables.ts, 2, 18))
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>V : Symbol(V, Decl(nonPrimitiveAndTypeVariables.ts, 2, 9))
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type B<T, V> = { [P in keyof T]: T[P] extends V | object ? 1 : 0; };
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>B : Symbol(B, Decl(nonPrimitiveAndTypeVariables.ts, 2, 59))
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>T : Symbol(T, Decl(nonPrimitiveAndTypeVariables.ts, 3, 7))
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>V : Symbol(V, Decl(nonPrimitiveAndTypeVariables.ts, 3, 9))
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>P : Symbol(P, Decl(nonPrimitiveAndTypeVariables.ts, 3, 18))
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>T : Symbol(T, Decl(nonPrimitiveAndTypeVariables.ts, 3, 7))
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>T : Symbol(T, Decl(nonPrimitiveAndTypeVariables.ts, 3, 7))
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>P : Symbol(P, Decl(nonPrimitiveAndTypeVariables.ts, 3, 18))
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>V : Symbol(V, Decl(nonPrimitiveAndTypeVariables.ts, 3, 9))
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let a: A<{ a: 0 | 1 }, 0> = { a: 0 };
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>a : Symbol(a, Decl(nonPrimitiveAndTypeVariables.ts, 5, 3))
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>A : Symbol(A, Decl(nonPrimitiveAndTypeVariables.ts, 0, 0))
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>a : Symbol(a, Decl(nonPrimitiveAndTypeVariables.ts, 5, 10))
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>a : Symbol(a, Decl(nonPrimitiveAndTypeVariables.ts, 5, 29))
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let b: B<{ a: 0 | 1 }, 0> = { a: 0 };
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>b : Symbol(b, Decl(nonPrimitiveAndTypeVariables.ts, 6, 3))
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>B : Symbol(B, Decl(nonPrimitiveAndTypeVariables.ts, 2, 59))
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>a : Symbol(a, Decl(nonPrimitiveAndTypeVariables.ts, 6, 10))
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>a : Symbol(a, Decl(nonPrimitiveAndTypeVariables.ts, 6, 29))
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function foo<T, U>(x: T) {
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>foo : Symbol(foo, Decl(nonPrimitiveAndTypeVariables.ts, 6, 37))
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>T : Symbol(T, Decl(nonPrimitiveAndTypeVariables.ts, 8, 13))
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>U : Symbol(U, Decl(nonPrimitiveAndTypeVariables.ts, 8, 15))
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>x : Symbol(x, Decl(nonPrimitiveAndTypeVariables.ts, 8, 19))
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>T : Symbol(T, Decl(nonPrimitiveAndTypeVariables.ts, 8, 13))
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let a: object = x; // Error
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>a : Symbol(a, Decl(nonPrimitiveAndTypeVariables.ts, 9, 7))
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>x : Symbol(x, Decl(nonPrimitiveAndTypeVariables.ts, 8, 19))
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let b: U | object = x; // Error
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>b : Symbol(b, Decl(nonPrimitiveAndTypeVariables.ts, 10, 7))
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>U : Symbol(U, Decl(nonPrimitiveAndTypeVariables.ts, 8, 15))
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>x : Symbol(x, Decl(nonPrimitiveAndTypeVariables.ts, 8, 19))
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}
52+

‎tests/baselines/reference/nonPrimitiveAndTypeVariables.types

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@@ -0,0 +1,56 @@
1+
=== tests/cases/conformance/types/nonPrimitive/nonPrimitiveAndTypeVariables.ts ===
2+
// Repros from #23800
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type A<T, V> = { [P in keyof T]: T[P] extends V ? 1 : 0; };
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>A : A<T, V>
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>T : T
7+
>V : V
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>P : P
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>T : T
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>T : T
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>P : P
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>V : V
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14+
type B<T, V> = { [P in keyof T]: T[P] extends V | object ? 1 : 0; };
15+
>B : B<T, V>
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>T : T
17+
>V : V
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>P : P
19+
>T : T
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>T : T
21+
>P : P
22+
>V : V
23+
24+
let a: A<{ a: 0 | 1 }, 0> = { a: 0 };
25+
>a : A<{ a: 0 | 1; }, 0>
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>A : A<T, V>
27+
>a : 0 | 1
28+
>{ a: 0 } : { a: 0; }
29+
>a : 0
30+
>0 : 0
31+
32+
let b: B<{ a: 0 | 1 }, 0> = { a: 0 };
33+
>b : B<{ a: 0 | 1; }, 0>
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>B : B<T, V>
35+
>a : 0 | 1
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>{ a: 0 } : { a: 0; }
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>a : 0
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>0 : 0
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40+
function foo<T, U>(x: T) {
41+
>foo : <T, U>(x: T) => void
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>T : T
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>U : U
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>x : T
45+
>T : T
46+
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let a: object = x; // Error
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>a : object
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>x : T
50+
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let b: U | object = x; // Error
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>b : object | U
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>U : U
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>x : T
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}
56+

‎tests/cases/conformance/types/nonPrimitive/nonPrimitiveAndTypeVariables.ts

+14
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@@ -0,0 +1,14 @@
1+
// @strict: true
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3+
// Repros from #23800
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5+
type A<T, V> = { [P in keyof T]: T[P] extends V ? 1 : 0; };
6+
type B<T, V> = { [P in keyof T]: T[P] extends V | object ? 1 : 0; };
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8+
let a: A<{ a: 0 | 1 }, 0> = { a: 0 };
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let b: B<{ a: 0 | 1 }, 0> = { a: 0 };
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11+
function foo<T, U>(x: T) {
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let a: object = x; // Error
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let b: U | object = x; // Error
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}

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