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tests/cases/compiler/optionalParameterProperty.ts(6,7): error TS2415: Class 'D' incorrectly extends base class 'C'.
Types of property 'p' are incompatible.
Type 'number | undefined' is not assignable to type 'number'.
Type 'undefined' is not assignable to type 'number'.
==== tests/cases/compiler/optionalParameterProperty.ts (1 errors) ====
class C {
p: number;
}
class D extends C {
~
!!! error TS2415: Class 'D' incorrectly extends base class 'C'.
!!! error TS2415: Types of property 'p' are incompatible.
!!! error TS2415: Type 'number | undefined' is not assignable to type 'number'.
!!! error TS2415: Type 'undefined' is not assignable to type 'number'.
constructor(public p?: number) {
super();
}
}
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