title: tslint: namespace and module are disallowed
body: <p>I recently got a legacy .ts-file and want to update it.</p>
  
  <p>Two of the warnings say:</p>
  
  <p><code>'namespace' and 'module' are disallowed</code></p>
  
  <p>and</p>
  
  <p><code>The internal 'module' syntax is deprecated, use the 'namespace' keyword instead.</code></p>
  
  <p>I read about using standardized ES6-style external modules, but I cannot figure out, how to do this.</p>
  
  <p>My code looks like the following:</p>
  
  <pre><code>export namespace MySpace
  {
    export module MyModule
    {
      export interface MyInterface
      {
      }
  
      export class MyClass
      {
      }
      ...
    }
  }
  </code></pre>
  
  <p>May anyone give me a hint, how to update this structure to actual style rules?</p>
  
  <p>thank you all a lot in advance!</p>
  
  <p>best regards</p>
  
  <p>mrt</p>