tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendingPrimitive2.ts(3,19): error TS1133: Type reference expected. tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendingPrimitive2.ts(4,19): error TS1133: Type reference expected. tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendingPrimitive2.ts(4,24): error TS1005: ';' expected. ==== tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendingPrimitive2.ts (3 errors) ==== // classes cannot extend primitives class C4a extends void {} ~~~~ !!! error TS1133: Type reference expected. class C5a extends null { } ~~~~ !!! error TS1133: Type reference expected. ~ !!! error TS1005: ';' expected.