.eslintrc.json

{
  "root": true,
  "parser": "@typescript-eslint/parser",
  "plugins": ["@typescript-eslint", "prettier"],
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/eslint-recommended",
    "plugin:@typescript-eslint/recommended",
    "prettier"
  ],
  "overrides": [
    // typescript files
    {
      "files": ["*.ts", "*.tsx"],
      "excludedFiles": ["*.test.js", "next.config.js"],
      "plugins": ["@typescript-eslint", "prettier"],
      "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:@typescript-eslint/recommended",
        "prettier"
      ]
    },
    // nextjs files
    {
      "files": ["*.js", "*.jsx"],
      "env": {
        "node": true
      },
      "rules": {
        "@typescript-eslint/no-var-requires": "off"
      }
    }
  ],
  "rules": {
    "no-console": 1, // Means warning
    "prettier/prettier": 2 // Means error
  }
}