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