title: Google Closure Compiler not consistent between UI and application
body: <p>I have a file <code>hello-world.iife.js</code>, which is a bundled Preact widget.</p>
  <p>When I compile <code>hello-world.iife.js</code> with <a href="https://closure-compiler.appspot.com/home" rel="nofollow noreferrer">https://closure-compiler.appspot.com/home</a>, I can use it in Firefox 5.</p>
  <p>When I compile <code>hello-world.iife.js</code> through either <code>google-closure-compiler</code> npm package, the <code>.jar</code> application provided by Google, or even a community maintained Rollup plugin (based on <code>google-closure-compiler</code>), the code does not work in Firefox 5 (although the code is compiled successfully).</p>
  <p>The code I get from the two different methods of compilation is different (which shouldn't be if I'm using the same settings, right?). What am I missing?</p>
  <p>The script that I'm using to compile the JavaScript using the <code>.jar</code> is <code>java -jar compiler.jar --js dist/preact-hello.iife.js --js_output_file hello-compiled.js --compilation_level SIMPLE</code></p>