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Don't compare "missing" to undefined in compareProperties under exactOptionalPropertyTypes #61683

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Merged
merged 2 commits into from
Sep 30, 2025
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Merged

Don't compare "missing" to undefined in compareProperties under exactOptionalPropertyTypes #61683

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307b09b
fix 61547
HansBrende May 9, 2025
a669f2b
Merge branch 'main' into fix61547
HansBrende Sep 22, 2025
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2 changes: 1 addition & 1 deletion src/compiler/checker.ts
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Expand Up @@ -25275,7 +25275,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
if (isReadonlySymbol(sourceProp) !== isReadonlySymbol(targetProp)) {
return Ternary.False;
}
return compareTypes(getTypeOfSymbol(sourceProp), getTypeOfSymbol(targetProp));
return compareTypes(getNonMissingTypeOfSymbol(sourceProp), getNonMissingTypeOfSymbol(targetProp));
}

function isMatchingSignature(source: Signature, target: Signature, partialMatch: boolean) {
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15 changes: 15 additions & 0 deletions tests/baselines/reference/exactOptionalPropertyTypesIdentical.errors.txt
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@@ -0,0 +1,15 @@
exactOptionalPropertyTypesIdentical.ts(2,12): error TS2322: Type '<T>() => T extends { a?: string; } ? 0 : 1' is not assignable to type '<T>() => T extends { a?: string | undefined; } ? 0 : 1'.
Type 'T extends { a?: string; } ? 0 : 1' is not assignable to type 'T extends { a?: string | undefined; } ? 0 : 1'.
Type '0 | 1' is not assignable to type 'T extends { a?: string | undefined; } ? 0 : 1'.
Type '0' is not assignable to type 'T extends { a?: string | undefined; } ? 0 : 1'.


==== exactOptionalPropertyTypesIdentical.ts (1 errors) ====
export let a: <T>() => T extends {a?: string} ? 0 : 1 = null!;
export let b: <T>() => T extends {a?: string | undefined} ? 0 : 1 = a;
~
!!! error TS2322: Type '<T>() => T extends { a?: string; } ? 0 : 1' is not assignable to type '<T>() => T extends { a?: string | undefined; } ? 0 : 1'.
!!! error TS2322: Type 'T extends { a?: string; } ? 0 : 1' is not assignable to type 'T extends { a?: string | undefined; } ? 0 : 1'.
!!! error TS2322: Type '0 | 1' is not assignable to type 'T extends { a?: string | undefined; } ? 0 : 1'.
!!! error TS2322: Type '0' is not assignable to type 'T extends { a?: string | undefined; } ? 0 : 1'.

13 changes: 13 additions & 0 deletions tests/baselines/reference/exactOptionalPropertyTypesIdentical.js
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@@ -0,0 +1,13 @@
//// [tests/cases/compiler/exactOptionalPropertyTypesIdentical.ts] ////

//// [exactOptionalPropertyTypesIdentical.ts]
export let a: <T>() => T extends {a?: string} ? 0 : 1 = null!;
export let b: <T>() => T extends {a?: string | undefined} ? 0 : 1 = a;


//// [exactOptionalPropertyTypesIdentical.js]
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.b = exports.a = void 0;
exports.a = null;
exports.b = exports.a;
16 changes: 16 additions & 0 deletions tests/baselines/reference/exactOptionalPropertyTypesIdentical.symbols
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@@ -0,0 +1,16 @@
//// [tests/cases/compiler/exactOptionalPropertyTypesIdentical.ts] ////

=== exactOptionalPropertyTypesIdentical.ts ===
export let a: <T>() => T extends {a?: string} ? 0 : 1 = null!;
>a : Symbol(a, Decl(exactOptionalPropertyTypesIdentical.ts, 0, 10))
>T : Symbol(T, Decl(exactOptionalPropertyTypesIdentical.ts, 0, 15))
>T : Symbol(T, Decl(exactOptionalPropertyTypesIdentical.ts, 0, 15))
>a : Symbol(a, Decl(exactOptionalPropertyTypesIdentical.ts, 0, 34))

export let b: <T>() => T extends {a?: string | undefined} ? 0 : 1 = a;
>b : Symbol(b, Decl(exactOptionalPropertyTypesIdentical.ts, 1, 10))
>T : Symbol(T, Decl(exactOptionalPropertyTypesIdentical.ts, 1, 15))
>T : Symbol(T, Decl(exactOptionalPropertyTypesIdentical.ts, 1, 15))
>a : Symbol(a, Decl(exactOptionalPropertyTypesIdentical.ts, 1, 34))
>a : Symbol(a, Decl(exactOptionalPropertyTypesIdentical.ts, 0, 10))

19 changes: 19 additions & 0 deletions tests/baselines/reference/exactOptionalPropertyTypesIdentical.types
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//// [tests/cases/compiler/exactOptionalPropertyTypesIdentical.ts] ////

=== exactOptionalPropertyTypesIdentical.ts ===
export let a: <T>() => T extends {a?: string} ? 0 : 1 = null!;
>a : <T>() => T extends { a?: string; } ? 0 : 1
> : ^ ^^^^^^^
>a : string | undefined
> : ^^^^^^^^^^^^^^^^^^
>null! : never
> : ^^^^^

export let b: <T>() => T extends {a?: string | undefined} ? 0 : 1 = a;
>b : <T>() => T extends { a?: string | undefined; } ? 0 : 1
> : ^ ^^^^^^^
>a : string | undefined
> : ^^^^^^^^^^^^^^^^^^
>a : <T>() => T extends { a?: string; } ? 0 : 1
> : ^ ^^^^^^^

5 changes: 5 additions & 0 deletions tests/cases/compiler/exactOptionalPropertyTypesIdentical.ts
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@@ -0,0 +1,5 @@
// @strictNullChecks: true
// @exactOptionalPropertyTypes: true

export let a: <T>() => T extends {a?: string} ? 0 : 1 = null!;
export let b: <T>() => T extends {a?: string | undefined} ? 0 : 1 = a;
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