title: Project must list all files or use an 'include' pattern
body: <p>I see this warning thrown in VSCode:</p>
  
  <p><a href="https://i.stack.imgur.com/jvUsk.png" rel="noreferrer"><img src="https://i.stack.imgur.com/jvUsk.png" alt="VSCode Warning"></a></p>
  
  <p>This is the line that throws the ts warning:</p>
  
  <pre class="lang-js prettyprint-override"><code>import packageJson from "../package.json";
  </code></pre>
  
  <p>Weirdly, building and linting the project works fine:</p>
  
  <pre class="lang-sh prettyprint-override"><code>$ tsc --project .
  ✨  Done in 1.16s.
  </code></pre>
  
  <pre class="lang-sh prettyprint-override"><code>$ tslint --config ../../tslint.json --project .
  ✨  Done in 1.59s.
  </code></pre>
  
  <p>Is this a warning caused by the VSCode parser, or is there something wrong in my <code>tsconfig.json</code> file?</p>
  
  <pre><code>// tsconfig.json
  {
    "exclude": [
      "node_modules"
    ],
    "extends": "../../tsconfig.json",
    "files": [
      "package.json"
    ],
    "include": [
      "src/**/*"
    ],
    "compilerOptions": {
      /* Basic Options */
      "outDir": "dist",
      /* Module Resolution Options */
      "baseUrl": ".",
    }
  }
  </code></pre>