tests/cases/compiler/moduleAsBaseType.ts(2,17): error TS2304: Cannot find name 'M'. tests/cases/compiler/moduleAsBaseType.ts(3,21): error TS2304: Cannot find name 'M'. tests/cases/compiler/moduleAsBaseType.ts(4,21): error TS2304: Cannot find name 'M'. ==== tests/cases/compiler/moduleAsBaseType.ts (3 errors) ==== module M {} class C extends M {} ~ !!! error TS2304: Cannot find name 'M'. interface I extends M { } ~ !!! error TS2304: Cannot find name 'M'. class C2 implements M { } ~ !!! error TS2304: Cannot find name 'M'.