title: Vue / Typescript: Cannot find module 'vue-simplemde'
body: <p><strong>I can import <em>most</em> npm modules with no problem</strong> like axios, firebase, etc.., but for some reason <code>import MDE from 'vue-simplemde'</code> throws an error:</p>
  
  <pre><code>Cannot find module 'vue-simplemde'.Vetur(2307)
  </code></pre>
  
  <p>The code:</p>
  
  <pre><code>&lt;script lang="ts"&gt;
     import Vue from 'vue'
     import firebase from 'firebase/app' // Works!
     import MDE from 'vue-simplemde' // Cannot find module 'vue-simplemde'.Vetur(2307)
     import axios from 'axios' // Works!
  
     export default Vue.extend({
         [...]
     })
  &lt;/script&gt;
  </code></pre>
  
  <p>package.json:</p>
  
  <pre><code>[...]
  "dependencies": {
      [...]
      "firebase": "^7.14.4",
      "vue-simplemde": "^1.0.6",
      [...]
    },
  [...]
  </code></pre>
  
  <p>The editor does work after compiling the code, but the error remains.
  I could ignore the error with <code>// @ts-ignore</code>, but this problem produces type checking issues in the whole rest of the Vue component, throwing <code>Property XX does not exist on type CombinedVueInstance...</code> errors. Commenting out this import solves those problems.</p>
  
  <p><strong>Can I make this package compatible with typescript?</strong><br>
  Can I declare a module somehow, somewhere?</p>