==== tests/cases/compiler/importInsideModule_file2.ts (2 errors) ====
    export module myModule {
        import foo = require("importInsideModule_file1");
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! Import declarations in an internal module cannot reference an external module.
                             ~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! Cannot find external module 'importInsideModule_file1'.
        var a = foo.x;
    }
==== tests/cases/compiler/importInsideModule_file1.ts (0 errors) ====
    export var x = 1;