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Fixed a crash related to variadic tuple elements with intersections containing InstantiableNonPrimitive #63128

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Fixed a crash related to variadic tuple elements with intersections containing InstantiableNonPrimitive #63128

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6 changes: 5 additions & 1 deletion src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -17965,7 +17965,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
if (type.flags & TypeFlags.Any) {
addElement(type, ElementFlags.Rest, target.labeledElementDeclarations?.[i]);
}
else if (type.flags & TypeFlags.InstantiableNonPrimitive || isGenericMappedType(type)) {
else if (someContainedType(type, t => !!(t.flags & TypeFlags.InstantiableNonPrimitive) || isGenericMappedType(type))) {
// Generic variadic elements stay as they are.
addElement(type, ElementFlags.Variadic, target.labeledElementDeclarations?.[i]);
}
Expand Down Expand Up @@ -28515,6 +28515,10 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
return type.flags & TypeFlags.Union ? every((type as UnionType).types, f) : f(type);
}

function someContainedType(type: Type, f: (t: Type) => boolean): boolean {
return type.flags & TypeFlags.UnionOrIntersection ? some((type as UnionOrIntersectionType).types, f) : f(type);
}

function everyContainedType(type: Type, f: (t: Type) => boolean): boolean {
return type.flags & TypeFlags.UnionOrIntersection ? every((type as UnionOrIntersectionType).types, f) : f(type);
}
Expand Down
10 changes: 10 additions & 0 deletions tests/baselines/reference/recursiveConditionalCrash5.errors.txt
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@@ -0,0 +1,10 @@
recursiveConditionalCrash5.ts(3,60): error TS2589: Type instantiation is excessively deep and possibly infinite.


==== recursiveConditionalCrash5.ts (1 errors) ====
// https://github.com/microsoft/TypeScript/issues/63040

type StringTreeArrayAsTuple<T> = (T extends [...infer R] ? [...StringTreeArrayAsTuple<R>] : never) & boolean;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2589: Type instantiation is excessively deep and possibly infinite.

13 changes: 13 additions & 0 deletions tests/baselines/reference/recursiveConditionalCrash5.symbols
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@@ -0,0 +1,13 @@
//// [tests/cases/compiler/recursiveConditionalCrash5.ts] ////

=== recursiveConditionalCrash5.ts ===
// https://github.com/microsoft/TypeScript/issues/63040

type StringTreeArrayAsTuple<T> = (T extends [...infer R] ? [...StringTreeArrayAsTuple<R>] : never) & boolean;
>StringTreeArrayAsTuple : Symbol(StringTreeArrayAsTuple, Decl(recursiveConditionalCrash5.ts, 0, 0))
>T : Symbol(T, Decl(recursiveConditionalCrash5.ts, 2, 28))
>T : Symbol(T, Decl(recursiveConditionalCrash5.ts, 2, 28))
>R : Symbol(R, Decl(recursiveConditionalCrash5.ts, 2, 53))
>StringTreeArrayAsTuple : Symbol(StringTreeArrayAsTuple, Decl(recursiveConditionalCrash5.ts, 0, 0))
>R : Symbol(R, Decl(recursiveConditionalCrash5.ts, 2, 53))

9 changes: 9 additions & 0 deletions tests/baselines/reference/recursiveConditionalCrash5.types
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@@ -0,0 +1,9 @@
//// [tests/cases/compiler/recursiveConditionalCrash5.ts] ////

=== recursiveConditionalCrash5.ts ===
// https://github.com/microsoft/TypeScript/issues/63040

type StringTreeArrayAsTuple<T> = (T extends [...infer R] ? [...StringTreeArrayAsTuple<R>] : never) & boolean;
>StringTreeArrayAsTuple : StringTreeArrayAsTuple<T>
> : ^^^^^^^^^^^^^^^^^^^^^^^^^

6 changes: 6 additions & 0 deletions tests/cases/compiler/recursiveConditionalCrash5.ts
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@@ -0,0 +1,6 @@
// @strict: true
// @noEmit: true

// https://github.com/microsoft/TypeScript/issues/63040

type StringTreeArrayAsTuple<T> = (T extends [...infer R] ? [...StringTreeArrayAsTuple<R>] : never) & boolean;