Experimental decorators warning in TypeScript compilation
<p>I receive the warning...</p>

<blockquote>
  <p>Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option `to remove this warning.</p>
</blockquote>

<p>... even though my compilerOptions in tsconfig.json have the following settings:</p>

<pre><code>"emitDecoratorMetadata": true,
"experimentalDecorators": true,
</code></pre>

<p>What is weird is that some random classes that use decorators do not show that warning but the rest in the same project do.</p>

<p>What could cause such behavior in the TypeScript compiler?</p>