title: ESLint / VSCode. Eslint extension is not linting anything after opening new project inside VSCode
body: <p>I'm using ESLint extension inside my VSCode editor. Extension is installed and after creating starter files of my React project, I'm doing:</p>
  
  <pre><code>eslint --init
  </code></pre>
  
  <p>inside my terminal. 
  Then I choose AirBnb style guide with React. It creates .eslintrc.js file inside my project root folder.</p>
  
  <p>ESLint is installed globally, but for the purposes of this issue I've also reinstalled localy inside my root folder like this:</p>
  
  <pre><code>npm install eslint --save-dev
  </code></pre>
  
  <p>Then I open my VSCode editor and extension is not linting any problems inside my files but I know there are some problems.
  Can it be related with .tsx extensions? 
  I'm using TypeScript for the first time today. <strong>Do I have to use any extra packages to run up this?</strong> <strong>How to solve this?</strong></p>
  
  <p>I wanna mention that I had this problem before with other project, but there was no TypeScript - only .js and .jsx. Eslint extension was also not working, but suddenly during coding it started to run and warnings appears.</p>