title: Angular source maps sourceMappingUrl broken
body: <p>I have recently upgraded from Angular 7 to Angular 8 and I noticed that in Chrome and Firefox I have an error in the dev console</p>
  
  <p>Firefox:</p>
  
  <blockquote>
    <p>Source map error: SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data</p>
    
    <p>Source Map URL: [url]</p>
  </blockquote>
  
  <p>Chrome:</p>
  
  <blockquote>
    <p>DevTools failed to parse SourceMap
    <a href="https://mydomain/[url]" rel="nofollow noreferrer">https://mydomain/[url]</a></p>
  </blockquote>
  
  <p>When I inspect my <code>main.js</code> I see the following set for source sourceMappingURL</p>
  
  <pre><code>},[[0,"runtime","vendor"]]]);
  //# sourceMappingURL=[url]
  </code></pre>
  
  <p>I cannot, for the life of me, figure out where this is supposed to get configured or what has changed. Has anyone encountered this or know of a solution?</p>