Add eslint configuration from premium

[MAILPOET-3358]

eslint-config/.eslintrc-premium.json

@@ -0,0 +1,32 @@
+{
+  "extends": "airbnb",
+  "env": {
+    "browser": true
+  },
+  "parser": "babel-eslint",
+  "parserOptions": {
+    "ecmaVersion": 6,
+    "ecmaFeatures": {
+      "jsx": true
+    }
+  },
+  "plugins": [
+    "react-hooks"
+  ],
+  "settings": {
+    "import/resolver": "webpack"
+  },
+  "rules": {
+    // React hooks rules
+    "react-hooks/rules-of-hooks": "error",
+    "react-hooks/exhaustive-deps": "warn",
+    // Exceptions
+    "arrow-parens": ["error", "always"],
+    "comma-dangle": ["error", "always-multiline"],
+    "import/extensions": 0, // we wouldn't be able to import jQuery without this line
+    "jsx-a11y/anchor-is-valid": [ "error", {
+      "components": [ "Link" ],
+      "specialLink": [ "to" ]
+    }]
+  }
+}

eslint-config/.eslintrc-premium.ts.json

@@ -0,0 +1,65 @@
+{
+  "extends": [
+    "airbnb",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:@typescript-eslint/recommended-requiring-type-checking"
+  ],
+  "env": {
+    "amd": true,
+    "browser": true,
+    "mocha": true
+  },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "tsconfigRootDir": ".",
+    "project": ["./tsconfig.json"],
+    "ecmaVersion": 6,
+    "ecmaFeatures": {
+      "jsx": true
+    }
+  },
+  "plugins": [
+    "react-hooks",
+    "no-only-tests",
+    "@typescript-eslint"
+  ],
+  "settings": {
+    "import/resolver": "webpack"
+  },
+  "rules": {
+    "no-use-before-define": "off", // disable the original rule, use only the typescript rule on the next line
+    "@typescript-eslint/no-use-before-define": ["error"],
+    // PropTypes
+    "react/prop-types": 0,
+    "react/jsx-props-no-spreading": 0,
+    // Hooks
+    "react-hooks/rules-of-hooks": "error",
+    "react-hooks/exhaustive-deps": "warn",
+    // Exceptions
+    "react/jsx-filename-extension": 0,
+    "arrow-parens": ["error", "always"],
+    "comma-dangle": ["error", "always-multiline"],
+    "no-only-tests/no-only-tests": 2,
+    "no-script-url": 0,
+    "import/extensions": 0, // we wouldn't be able to import jQuery without this line
+    "import/prefer-default-export": 0, // we want to stop using default exports and start using named exports
+    "react/destructuring-assignment": 0, // that would be too many changes to fix this one
+    "prefer-destructuring": 0, // that would be too many changes to fix this one
+    "jsx-a11y/label-has-for": [2, {
+      "required": {"some": ["nesting", "id"]} // some of our labels are hidden and we cannot nest those
+    }],
+    "jsx-a11y/anchor-is-valid": 0, // cannot fix this one, it would break wprdpress themes
+    "jsx-a11y/label-has-associated-control": [ 2, {
+      "either": "either" // control has to be either nested or associated via htmlFor
+    }]
+  },
+  "overrides": [
+    {
+      "files": ["**/_stories/*.tsx"],
+      "rules": {
+        "import/no-extraneous-dependencies": ["error", { "devDependencies": true }]
+      }
+    }
+  ]
+}