.eslintrc.json

{
  "extends": [
    "next/core-web-vitals",
    "next/typescript",
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:@typescript-eslint/recommended-requiring-type-checking",
    "prettier"
  ],
  "plugins": ["@typescript-eslint"],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "project": "./tsconfig.json"
  },
  "rules": {
    // Strict TypeScript rules
    "@typescript-eslint/no-explicit-any": "error",
    "@typescript-eslint/explicit-function-return-type": "error",
    "@typescript-eslint/no-unused-vars": ["error", { "argsIgnorePattern": "^_" }],
    "@typescript-eslint/no-floating-promises": "error",
    "@typescript-eslint/no-non-null-assertion": "error",
    "@typescript-eslint/no-unnecessary-condition": "warn",

    // General strict rules
    "quotes": ["error", "double"],
    "no-console": ["error", { "allow": ["warn", "error"] }],
    "eqeqeq": "error",
    "curly": "error",
    "no-var": "error",
    "prefer-const": "error",
    "no-unused-expressions": "error",
    "no-shadow": "error",
    "no-return-await": "error",
    "require-await": "error",
    "no-throw-literal": "error",
    "no-param-reassign": "error",

    // React specific rules
    "react/jsx-boolean-value": "error",
    "react/jsx-no-useless-fragment": "error",
    "react/no-array-index-key": "error",
    "react/no-unused-prop-types": "error"
  }
}