95 lines
3.2 KiB
Plaintext
95 lines
3.2 KiB
Plaintext
==== tests/cases/conformance/interfaces/interfaceDeclarations/interfaceWithMultipleBaseTypes.ts (6 errors) ====
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// an interface may have multiple bases with properties of the same name as long as the interface's implementation satisfies all base type versions
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interface Base1 {
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x: {
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a: string;
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}
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}
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interface Base2 {
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x: {
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b: string;
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}
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}
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interface Derived extends Base1, Base2 {
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x: {
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a: string; b: string;
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}
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}
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interface Derived2 extends Base1, Base2 { // error
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~~~~~~~~
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!!! Interface 'Derived2' incorrectly extends interface 'Base2':
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!!! Types of property 'x' are incompatible:
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!!! Type '{ a: string; b: number; }' is not assignable to type '{ b: string; }':
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!!! Types of property 'b' are incompatible:
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!!! Type 'number' is not assignable to type 'string'.
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x: {
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a: string; b: number;
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}
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}
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module Generic {
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interface Base1<T> {
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x: {
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a: T;
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}
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}
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interface Base2<T> {
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x: {
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b: T;
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}
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}
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interface Derived<T> extends Base1<string>, Base2<number> {
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x: {
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a: string; b: number;
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}
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}
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interface Derived2<T, U> extends Base1<T>, Base2<U> {
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x: {
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a: T; b: U;
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}
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}
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interface Derived3<T> extends Base1<number>, Base2<number> { } // error
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~~~~~~~~
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!!! Interface 'Derived3<T>' cannot simultaneously extend types 'Base1<number>' and 'Base2<number>':
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!!! Named properties 'x' of types 'Base1<number>' and 'Base2<number>' are not identical.
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interface Derived4<T> extends Base1<number>, Base2<number> { // error
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~~~~~~~~
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!!! Interface 'Derived4<T>' incorrectly extends interface 'Base1<number>':
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!!! Types of property 'x' are incompatible:
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!!! Type '{ a: T; b: T; }' is not assignable to type '{ a: number; }':
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!!! Types of property 'a' are incompatible:
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!!! Type 'T' is not assignable to type 'number'.
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~~~~~~~~
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!!! Interface 'Derived4<T>' incorrectly extends interface 'Base2<number>':
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!!! Types of property 'x' are incompatible:
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!!! Type '{ a: T; b: T; }' is not assignable to type '{ b: number; }':
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!!! Types of property 'b' are incompatible:
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!!! Type 'T' is not assignable to type 'number'.
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x: {
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a: T; b: T;
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}
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}
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interface Derived5<T> extends Base1<T>, Base2<T> { // error
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~~~~~~~~
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!!! Interface 'Derived5<T>' incorrectly extends interface 'Base1<T>':
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!!! Types of property 'x' are incompatible:
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!!! Type 'T' is not assignable to type '{ a: T; }':
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!!! Property 'a' is missing in type '{}'.
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~~~~~~~~
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!!! Interface 'Derived5<T>' incorrectly extends interface 'Base2<T>':
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!!! Types of property 'x' are incompatible:
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!!! Type 'T' is not assignable to type '{ b: T; }':
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!!! Property 'b' is missing in type '{}'.
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x: T;
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}
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} |