tests/cases/compiler/module_augmentExistingVariable.ts(1,5): error TS2300: Duplicate identifier 'console'. tests/cases/compiler/module_augmentExistingVariable.ts(3,8): error TS2300: Duplicate identifier 'console'. ==== tests/cases/compiler/module_augmentExistingVariable.ts (2 errors) ==== var console: any; ~~~~~~~ !!! error TS2300: Duplicate identifier 'console'. module console { ~~~~~~~ !!! error TS2300: Duplicate identifier 'console'. export var x = 2; }