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// @strict: true
// @target: es2015
// Repro from #37163
declare class SomeBaseClass {
set<K extends keyof this>(key: K, value: this[K]): this[K];
}
abstract class SomeAbstractClass<C, M, R> extends SomeBaseClass {
foo!: (r?: R) => void;
bar!: (r?: any) => void;
abstract baz(c: C): Promise<M>;
}
class SomeClass extends SomeAbstractClass<number, string, boolean> {
async baz(context: number): Promise<string> {
return `${context}`;
}
}
type CType<T> = T extends SomeAbstractClass<infer C, any, any> ? C : never;
type MType<T> = T extends SomeAbstractClass<any, infer M, any> ? M : never;
type RType<T> = T extends SomeAbstractClass<any, any, infer R> ? R : never;
type SomeClassC = CType<SomeClass>; // number
type SomeClassM = MType<SomeClass>; // string
type SomeClassR = RType<SomeClass>; // boolean
// Repro from #37163
interface BaseType<T1, T2> {
set<K extends keyof this>(key: K, value: this[K]): this[K];
useT1(c: T1): void;
useT2(r?: T2): void;
unrelatedButSomehowRelevant(r?: any): void;
}
interface InheritedType extends BaseType<number, boolean> {
// This declaration shouldn't do anything...
useT1(_: number): void
}
// Structural expansion of InheritedType
interface StructuralVersion {
set<K extends keyof this>(key: K, value: this[K]): this[K];
useT1(c: number): void;
useT2(r?: boolean): void;
unrelatedButSomehowRelevant(r?: any): void;
}
type GetT1<T> = T extends BaseType<infer U, any> ? U : never;
type T1 = GetT1<InheritedType>; // number
type T2 = GetT1<StructuralVersion>; // number
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