// @target: es2015
// @strict: false
// @module: amd

// @filename: file1.d.ts
declare module "file1" {
    var x: number;
    export = x;
}

// @filename: file2.ts
/// <reference path="file1.d.ts"/>
import x = require("file1"); 

// augmentation for 'file1'
// should error since 'file1' does not have namespace meaning
declare module "file1" {
    interface A { a }
}

// @filename: file3.ts
import x = require("file1");
import "file2";
let a: x.A; // should not work