.eslintrc.json

{
  "root": true,
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "tsconfigRootDir": ".",
    "project": ["./tsconfig.json"]
  },
  "plugins": ["@typescript-eslint"],
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "prettier"
  ],
  "rules": {
    // disable the rule for all files
    "@typescript-eslint/explicit-function-return-type": "off"
  },
  "overrides": [
    {
      // enable the rule specifically for TypeScript files
      "files": ["*.ts", "*.mts", "*.cts", "*.tsx"],
      "rules": {
        "@typescript-eslint/explicit-function-return-type": ["error"],
        "@typescript-eslint/no-unused-vars": ["error"],
        "@typescript-eslint/no-explicit-any": ["error"],
        "@typescript-eslint/no-empty-interface": ["error"],
        "@typescript-eslint/no-extra-non-null-assertion": ["error"],
        "@typescript-eslint/no-inferrable-types": ["error"],
        "@typescript-eslint/no-unnecessary-boolean-literal-compare": ["error"],
        "@typescript-eslint/no-unnecessary-condition": ["error"],
        "@typescript-eslint/prefer-for-of": ["error"]
      }
    }
  ]
}