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tests/cases/compiler/inheritSameNamePropertiesWithDifferentOptionality.ts(9,11): error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
Named property 'x' of types 'C' and 'C2' are not identical.
==== tests/cases/compiler/inheritSameNamePropertiesWithDifferentOptionality.ts (1 errors) ====
interface C {
x?: number;
}
interface C2 {
x: number;
}
interface A extends C, C2 { // error
~
!!! error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
!!! error TS2320: Named property 'x' of types 'C' and 'C2' are not identical.
y: string;
}
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