77 lines
1.4 KiB
TypeScript
77 lines
1.4 KiB
TypeScript
//// [subtypingWithObjectMembers2.ts]
|
|
interface Base {
|
|
foo: string;
|
|
}
|
|
|
|
interface Derived extends Base {
|
|
bar: string;
|
|
}
|
|
|
|
// N and M have the same name, same accessibility, same optionality, and N is a subtype of M
|
|
// foo properties are valid, bar properties cause errors in the derived class declarations
|
|
module NotOptional {
|
|
interface A {
|
|
foo: Base;
|
|
bar: Base;
|
|
}
|
|
|
|
interface B extends A {
|
|
foo: Derived; // ok
|
|
bar: string; // error
|
|
}
|
|
|
|
interface A2 {
|
|
1: Base;
|
|
2.0: Base;
|
|
}
|
|
|
|
interface B2 extends A2 {
|
|
1: Derived; // ok
|
|
2: string; // error
|
|
}
|
|
|
|
interface A3 {
|
|
'1': Base;
|
|
'2.0': Base;
|
|
}
|
|
|
|
interface B3 extends A3 {
|
|
'1': Derived; // ok
|
|
'2.0': string; // error
|
|
}
|
|
}
|
|
|
|
// same cases as above but with optional
|
|
module Optional {
|
|
interface A {
|
|
foo?: Base;
|
|
bar?: Base;
|
|
}
|
|
|
|
interface B extends A {
|
|
foo?: Derived; // ok
|
|
bar?: string; // error
|
|
}
|
|
|
|
interface A2 {
|
|
1?: Base;
|
|
2.0?: Base;
|
|
}
|
|
|
|
interface B2 extends A2 {
|
|
1?: Derived; // ok
|
|
2?: string; // error
|
|
}
|
|
|
|
interface A3 {
|
|
'1'?: Base;
|
|
'2.0'?: Base;
|
|
}
|
|
|
|
interface B3 extends A3 {
|
|
'1'?: Derived; // ok
|
|
'2.0'?: string; // error
|
|
}
|
|
}
|
|
|
|
//// [subtypingWithObjectMembers2.js]
|