title: ESLint rule for whitespace before single-line inline comment
body: <p>I'm looking for something that I thought would be standard in ESLint rules but somehow can't find in the <a href="https://eslint.org/docs/rules/" rel="nofollow noreferrer">list of rules</a>.</p>
  <p>There is the <code>spaced-comment</code> rule that enforces a space immediately <strong>after</strong> the opening // of single-line comment.</p>
  <p>I would like to enforce a white space immediately <strong>before</strong> an inline comment.</p>
  <pre><code>test(); // This would be allowed
  test();// This wouldn't be
  </code></pre>
  <p>Is there a rule I'm not seeing for this?</p>