Added ESLint and deployed on Travis, fixed revert #52

.eslintrc.js

@@ -0,0 +1,37 @@
+module.exports = {
+  root: true,
+  parser: "@typescript-eslint/parser",
+  plugins: ["@typescript-eslint"],
+  extends: [
+    "airbnb-typescript",
+    "prettier",
+    "prettier/@typescript-eslint",
+    "prettier/react",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:react/recommended"
+  ],
+  parserOptions: {
+    project: "./tsconfig.json",
+    tsconfigRootDir: __dirname
+  },
+  rules: {
+    "@typescript-eslint/no-use-before-define": [
+      "error",
+      {
+        functions: false,
+        classes: false,
+        variables: false,
+        typedefs: false
+      }
+    ],
+    "import/prefer-default-export": "off",
+    "no-shadow": "off",
+    "no-unused-vars": "off",
+    "@typescript-eslint/no-unused-vars": ["off"],
+    "global-require": "off",
+    "react/jsx-props-no-spreading": ["off"],
+    "react/no-array-index-key": "off",
+    "no-underscore-dangle": "off",
+    "no-return-assign": "off"
+  }
+};

.travis.yml

@@ -13,4 +13,6 @@ script:
   - pre-commit run -a
   - npm install -g expo-cli --loglevel=error
   - npm install --log-level=error
+  - echo "fakeSecret" >> secrets.js
+  - npm run lint
   - npm test

README.md

@@ -38,3 +38,11 @@ To run this react-native application and start development:
    - `npm start`
 
 There you go! You can now connect your phone and start developing and debugging your application!
+
+## Linting 
+
+### ESLint 
+
+* `npm run lint`: To start the linter to look for code smells
+* `npm run lint-fix`: To allow the linter to fix some of the code smells however some may need to be fixed manually
+