77 lines
1.3 KiB
TypeScript
77 lines
1.3 KiB
TypeScript
//// [subtypingWithObjectMembers3.ts]
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interface Base {
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foo: string;
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}
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interface Derived extends Base {
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bar: string;
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}
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// N and M have the same name, same accessibility, same optionality, and N is a subtype of M
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// foo properties are valid, bar properties cause errors in the derived class declarations
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module NotOptional {
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interface A {
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foo: Base;
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bar: Derived;
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}
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interface B extends A {
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foo: Derived; // ok
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bar: Base; // error
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}
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interface A2 {
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1: Base;
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2.0: Derived;
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}
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interface B2 extends A2 {
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1: Derived; // ok
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2: Base; // error
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}
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interface A3 {
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'1': Base;
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'2.0': Derived;
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}
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interface B3 extends A3 {
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'1': Derived; // ok
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'2.0': Base; // error
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}
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}
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module Optional {
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interface A {
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foo?: Base;
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bar?: Derived;
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}
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interface B extends A {
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foo?: Derived; // ok
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bar?: Base; // error
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}
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interface A2 {
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1?: Base;
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2.0?: Derived;
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}
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interface B2 extends A2 {
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1?: Derived; // ok
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2?: Base; // error
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}
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interface A3 {
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'1'?: Base;
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'2.0'?: Derived;
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}
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interface B3 extends A3 {
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'1'?: Derived; // ok
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'2.0'?: Base; // error
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}
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}
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//// [subtypingWithObjectMembers3.js]
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