title: ESLint linting my Typescript files correctly
body: <p>I have .js files ( src/client/...) and .ts files ( src/server/.. )</p>
  
  <p>I installed the following packages :</p>
  
  <p><strong>package.json</strong></p>
  
  <pre><code>  "eslint": "^5.11.1",
    "eslint-config-airbnb-base": "^13.1.0",
    "eslint-config-typescript": "^1.1.0",
    "eslint-plugin-import": "^2.14.0",
    "eslint-plugin-typescript": "^0.14.0",
    ....
    "typescript": "^3.0.3",
    "typescript-eslint-parser": "^21.0.2",
  </code></pre>
  
  <p>And I defined the following aslant config in package.json</p>
  
  <pre><code>  "eslintConfig": {
      "extends": ["airbnb-base", "eslint:recommended", "typescript"],
      "env": { "es6": true, "browser": true },
      "parserOptions": { "parser": "typescript-eslint-parser" },
      "plugins": ["typescript"],
      "rules": {
        "no-unused-vars": ["error", { "vars": "all", "args": "after-used", "ignoreRestSiblings": false }],
        "no-var": ["off"],
        "one-var": ["off"],
        "prefer-destructuring": ["error", { "object": false, "array": false } ],
        "no-underscore-dangle": ["error", { "allow": ["__blogPostData"] }]
      }
    }
  </code></pre>
  
  <p>Then I set the lint script :</p>
  
  <pre><code> "lint": "eslint src --fix",
  </code></pre>
  
  <p>It's listing correctly all my .js files , but I don't see any warnings/errors in my .ts files ( I doubt they are all well written...)</p>
  
  <p>Am I wrong or missing anything in my eslint setup for typescript  ?</p>