165 lines
3 KiB
Plaintext
165 lines
3 KiB
Plaintext
=== tests/cases/conformance/types/typeRelationships/subtypesAndSuperTypes/subtypingWithObjectMembersOptionality.ts ===
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// Derived member is not optional but base member is, should be ok
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interface Base { foo: string; }
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>Base : Base
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>foo : string
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interface Derived extends Base { bar: string; }
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>Derived : Derived
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>Base : Base
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>bar : string
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interface Derived2 extends Derived { baz: string; }
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>Derived2 : Derived2
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>Derived : Derived
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>baz : string
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// S is a subtype of a type T, and T is a supertype of S, if one of the following is true, where S' denotes the apparent type (section 3.8.1) of S:
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// - S' and T are object types and, for each member M in T, one of the following is true:
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// - M is a property and S' contains a property N where
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// M and N have the same name,
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// the type of N is a subtype of that of M,
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// M and N are both public or both private, and
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// if M is a required property, N is also a required property.
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// - M is an optional property and S' contains no property of the same name as M.
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interface T {
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>T : T
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Foo?: Base;
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>Foo : Base
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>Base : Base
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}
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interface S extends T {
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>S : S
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>T : T
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Foo: Derived
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>Foo : Derived
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>Derived : Derived
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}
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interface T2 {
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>T2 : T2
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1?: Base;
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>Base : Base
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}
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interface S2 extends T2 {
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>S2 : S2
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>T2 : T2
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1: Derived;
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>Derived : Derived
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}
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interface T3 {
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>T3 : T3
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'1'?: Base;
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>Base : Base
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}
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interface S3 extends T3 {
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>S3 : S3
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>T3 : T3
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'1.': Derived;
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>Derived : Derived
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}
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// object literal case
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var a: { Foo?: Base; };
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>a : { Foo?: Base; }
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>Foo : Base
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>Base : Base
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var b = { Foo: <Derived>null };
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>b : { Foo: Derived; }
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>{ Foo: <Derived>null } : { Foo: Derived; }
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>Foo : Derived
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><Derived>null : Derived
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>Derived : Derived
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>null : null
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var r = true ? a : b;
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>r : { Foo?: Base; }
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>true ? a : b : { Foo?: Base; }
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>true : boolean
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>a : { Foo?: Base; }
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>b : { Foo: Derived; }
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module TwoLevels {
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>TwoLevels : typeof TwoLevels
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interface T {
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>T : T
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Foo?: Base;
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>Foo : Base
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>Base : Base
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}
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interface S extends T {
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>S : S
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>T : T
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Foo: Derived2
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>Foo : Derived2
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>Derived2 : Derived2
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}
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interface T2 {
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>T2 : T2
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1?: Base;
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>Base : Base
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}
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interface S2 extends T2 {
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>S2 : S2
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>T2 : T2
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1: Derived2;
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>Derived2 : Derived2
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}
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interface T3 {
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>T3 : T3
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'1'?: Base;
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>Base : Base
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}
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interface S3 extends T3 {
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>S3 : S3
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>T3 : T3
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'1.': Derived2;
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>Derived2 : Derived2
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}
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// object literal case
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var a: { Foo?: Base; };
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>a : { Foo?: Base; }
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>Foo : Base
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>Base : Base
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var b = { Foo: <Derived2>null };
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>b : { Foo: Derived2; }
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>{ Foo: <Derived2>null } : { Foo: Derived2; }
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>Foo : Derived2
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><Derived2>null : Derived2
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>Derived2 : Derived2
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>null : null
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var r = true ? a : b;
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>r : { Foo?: Base; }
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>true ? a : b : { Foo?: Base; }
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>true : boolean
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>a : { Foo?: Base; }
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>b : { Foo: Derived2; }
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}
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