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//// [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]
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