title: How can I define tab size to 4 in ESLint?
body: <p>I'm experimenting with ESLint in my workspace and I got little confused by the indent rule.</p>
  
  <p>Here is my rule for indent setting:</p>
  
  <pre><code>"rules": {
    "indent": [
      "error", "tab"
    ]
  }
  </code></pre>
  
  <p>The documentation only says that there are only two options: a positive number for number of spaces and "tab".</p>
  
  <p>My question is how can I define tab size of 4 rather than just "tab"?
  Is it possible to use the indent rule for this?</p>
  
  <p>I'm using vscode.</p>