tests/cases/compiler/classExtendsInterface.ts(2,17): error TS2311: A class may only extend another class. tests/cases/compiler/classExtendsInterface.ts(6,21): error TS2311: A class may only extend another class. ==== tests/cases/compiler/classExtendsInterface.ts (2 errors) ==== interface Comparable {} class A extends Comparable {} ~~~~~~~~~~ !!! error TS2311: A class may only extend another class. class B implements Comparable {} interface Comparable2 {} class A2 extends Comparable2 {} ~~~~~~~~~~~~~~ !!! error TS2311: A class may only extend another class. class B2 implements Comparable2 {}