My tsconfig.json

tsconfig.json & eslint config I use for Next.js & Node.js projects

For Next.js

• tsconfig.json

{
  "compilerOptions": {
    "target": "es2017",
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": true,
    "checkJs": true,
    "skipLibCheck": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "noEmit": true,
    "esModuleInterop": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "jsx": "preserve",
    "incremental": true,
    "baseUrl": ".",
    "paths": {
      "@/*": ["./src/*"]
    },
    "plugins": [
      {
        "name": "next"
      }
    ]

    "noFallthroughCasesInSwitch": true,
    "noImplicitOverride": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "useUnknownInCatchVariables": true,
    "allowSyntheticDefaultImports": true,
    "useDefineForClassFields": true,
  },
  "include": [
    ".eslintrc.cjs",
    "next-env.d.ts",
    "**/*.ts",
    "**/*.tsx",
    "**/*.cjs",
    "**/*.mjs",
    ".next/types/**/*.ts"
  ],
  "exclude": ["node_modules"]
}

• eslint

{
  "plugins": ["@typescript-eslint"],
  "extends": ["next/core-web-vitals", "plugin:@typescript-eslint/recommended"],
  "rules": {
    "@typescript-eslint/no-explicit-any": "off",
    "prefer-const": "warn",
    "@typescript-eslint/no-unused-vars": [
      "warn", // or "error"
      {
        "argsIgnorePattern": "^_",
        "varsIgnorePattern": "^_",
        "caughtErrorsIgnorePattern": "^_"
      }
    ],
    "@typescript-eslint/no-non-null-asserted-optional-chain": "off",
    "@typescript-eslint/no-non-null-assertion": "off",

    "@typescript-eslint/no-empty-function": [
      "error",
      {
        "allow": ["arrowFunctions"]
      }
    ]
  }
}

For Node.js

• Install these dev dependencies

typescript-eslint eslint typescript

• tsconfig.json

{
  "compilerOptions": {
    "module": "NodeNext",
    "target": "ES2022",
    "moduleResolution": "NodeNext",
    "outDir": "./dist",
    "allowJs": true,
    "checkJs": true,
    "skipLibCheck": true,
    "strict": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitOverride": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "useUnknownInCatchVariables": true,
    "noUncheckedIndexedAccess": true /* This depends on you */,
    "allowSyntheticDefaultImports": true,
    "useDefineForClassFields": true,
    "forceConsistentCasingInFileNames": true,
    "esModuleInterop": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "incremental": true,
    "typeRoots": ["./src/@types"]
  },
  "include": ["src/**/*.ts"]
}

• eslint

{
  "plugins": ["@typescript-eslint"],
  "parser": "@typescript-eslint/parser",
  "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
  "rules": {
    "@typescript-eslint/no-explicit-any": "off",
    "prefer-const": "warn",
    "@typescript-eslint/no-unused-vars": [
      "warn", // or "error"
      {
        "argsIgnorePattern": "^_",
        "varsIgnorePattern": "^_",
        "caughtErrorsIgnorePattern": "^_"
      }
    ],
    "@typescript-eslint/no-non-null-asserted-optional-chain": "off",
    "@typescript-eslint/no-non-null-assertion": "off",

    "@typescript-eslint/consistent-type-imports": [
      "error",
      { "prefer": "type-imports", "fixStyle": "inline-type-imports" }
    ],

    "@typescript-eslint/no-empty-function": [
      "error",
      {
        "allow": ["arrowFunctions"]
      }
    ]
  }
}