tests/cases/compiler/inheritanceStaticFuncOverridingAccessor.ts(2,16): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher. tests/cases/compiler/inheritanceStaticFuncOverridingAccessor.ts(5,16): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher. tests/cases/compiler/inheritanceStaticFuncOverridingAccessor.ts(10,7): error TS2417: Class static side 'typeof b' incorrectly extends base class static side 'typeof a'. Types of property 'x' are incompatible. Type '() => string' is not assignable to type 'string'. ==== tests/cases/compiler/inheritanceStaticFuncOverridingAccessor.ts (3 errors) ==== class a { static get x() { ~ !!! error TS1056: Accessors are only available when targeting ECMAScript 5 and higher. return "20"; } static set x(aValue: string) { ~ !!! error TS1056: Accessors are only available when targeting ECMAScript 5 and higher. } } class b extends a { ~ !!! error TS2417: Class static side 'typeof b' incorrectly extends base class static side 'typeof a'. !!! error TS2417: Types of property 'x' are incompatible. !!! error TS2417: Type '() => string' is not assignable to type 'string'. static x() { return "20"; } }