title: TypeScript type ignore case
body: <p>I have this type definition in TypeScript:</p>
  
  <pre><code>export type xhrTypes = "GET" | "POST" | "PUT" | "DELETE" | "OPTIONS" | "CONNECT" | "HEAD";
  </code></pre>
  
  <p>Sadly, this is case sensitive...is there any way to define it case insensitive?</p>
  
  <p>thanks</p>