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Fixed contravariant inferences from annotated optional parameters #55397

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merged 2 commits into from
Aug 16, 2023
Merged

Fixed contravariant inferences from annotated optional parameters #55397

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6a188ae
Fixed contravariant inferences from annotated optional parameters
Andarist Aug 16, 2023
3edbe2e
Handle JSDoc annotations better
Andarist Aug 16, 2023
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4 changes: 3 additions & 1 deletion src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -35120,7 +35120,9 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
if (declaration.type) {
const typeNode = getEffectiveTypeAnnotationNode(declaration);
if (typeNode) {
inferTypes(inferenceContext.inferences, getTypeFromTypeNode(typeNode), getTypeAtPosition(context, i));
const source = addOptionality(getTypeFromTypeNode(typeNode), /*isProperty*/ false, hasQuestionToken(declaration));
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hasQuestionToken(declaration) isn't going to do the right thing for jsdoc optional parameters - instead, use the catch-all isOptionalDeclaration.

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@Andarist Andarist Aug 16, 2023 •
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👍 pushed out the appropriate change (and a test case)

const target = getTypeAtPosition(context, i);
inferTypes(inferenceContext.inferences, source, target);
}
}
}
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25 changes: 25 additions & 0 deletions tests/baselines/reference/contravariantOnlyInferenceWithAnnotatedOptionalParameter.symbols
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@@ -0,0 +1,25 @@
//// [tests/cases/compiler/contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts] ////

=== contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts ===
// repro https://github.com/microsoft/TypeScript/issues/55394

declare function filter<T>(predicate: (value: T, index: number) => boolean): T;
>filter : Symbol(filter, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 0, 0))
>T : Symbol(T, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 2, 24))
>predicate : Symbol(predicate, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 2, 27))
>value : Symbol(value, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 2, 39))
>T : Symbol(T, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 2, 24))
>index : Symbol(index, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 2, 48))
>T : Symbol(T, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 2, 24))

const a = filter((pose?: number) => true);
>a : Symbol(a, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 3, 5))
>filter : Symbol(filter, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 0, 0))
>pose : Symbol(pose, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 3, 18))

const b = filter((pose?: number, _?: number) => true);
>b : Symbol(b, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 4, 5))
>filter : Symbol(filter, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 0, 0))
>pose : Symbol(pose, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 4, 18))
>_ : Symbol(_, Decl(contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts, 4, 32))

28 changes: 28 additions & 0 deletions tests/baselines/reference/contravariantOnlyInferenceWithAnnotatedOptionalParameter.types
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@@ -0,0 +1,28 @@
//// [tests/cases/compiler/contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts] ////

=== contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts ===
// repro https://github.com/microsoft/TypeScript/issues/55394

declare function filter<T>(predicate: (value: T, index: number) => boolean): T;
>filter : <T>(predicate: (value: T, index: number) => boolean) => T
>predicate : (value: T, index: number) => boolean
>value : T
>index : number

const a = filter((pose?: number) => true);
>a : number | undefined
>filter((pose?: number) => true) : number | undefined
>filter : <T>(predicate: (value: T, index: number) => boolean) => T
>(pose?: number) => true : (pose?: number) => true
>pose : number | undefined
>true : true

const b = filter((pose?: number, _?: number) => true);
>b : number | undefined
>filter((pose?: number, _?: number) => true) : number | undefined
>filter : <T>(predicate: (value: T, index: number) => boolean) => T
>(pose?: number, _?: number) => true : (pose?: number, _?: number) => true
>pose : number | undefined
>_ : number | undefined
>true : true

8 changes: 8 additions & 0 deletions tests/cases/compiler/contravariantOnlyInferenceWithAnnotatedOptionalParameter.ts
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@@ -0,0 +1,8 @@
// @strict: true
// @noEmit: true

// repro https://github.com/microsoft/TypeScript/issues/55394

declare function filter<T>(predicate: (value: T, index: number) => boolean): T;
const a = filter((pose?: number) => true);
const b = filter((pose?: number, _?: number) => true);
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