title: TypeScript built-in dictionary type/indexer shorthand?
body: <p>There're pre-made types for number-indexed indexers (<code>T[]</code> and <code>ArrayLike&lt;T&gt;</code>), but there doesn't seem to be one for string-index ones. This makes declaring them rather tedious. Is there a type declaration like below that I missed?</p>
  
  <pre><code>type Dict&lt;V&gt; = {[key: string]: V}
  </code></pre>