TypeScript namespaces and require

_references.d.ts

/// <reference path="src/someName.d.ts" />
/// <reference path="src/c1.ts" />
/// <reference path="src/c2.ts" />
/// <reference path="src/app.ts" />

src-app.ts

import someName = require('someName');

var t = new Test();
t.bar(someName());

var t2 = new NS.NSTest();
t2.bar(someName());

src-c1.ts

class Test {
    public foo: someName;

    public bar(arg: someName): someName {
        return someName();
    }
}

src-c2.ts

namespace NS {
    export class NSTest {
        public foo: someName;

        public bar(arg: someName): someName {
            return someName();
        }
    }
    var t = new NSTest();
    t.bar(someName());
}

src-someName.d.ts

declare module 'someName' {
    interface someName {
       (...args: any[]): someName
    }
    var someName:someName;
    export = someName;
}

tsconfig.json

{
    "compilerOptions": {
        "module": "commonjs",
        "target": "ES5",
        "out": "dist/dist.js",
        "sourceMap": true
    }
}