.eslintrc.json

{
    "parser": "@typescript-eslint/parser",
    "env": {
        "browser": true,
        "node": true
    },
    "plugins": [
        "prettier",
        "@typescript-eslint",
        "jest",
        "import"
    ],
    "extends": [
        "prettier",
        "plugin:prettier/recommended",
        "plugin:@typescript-eslint/recommended",
        "plugin:import/typescript",
        "plugin:jest/recommended"
    ],
    "parserOptions": {
        "sourceType": "module",
        "ecmaVersion": 2018
    },
    "rules": {
        "import/namespace": "off",
        "import/order": [
            "error"
        ],
        "no-unused-vars": "off",
        "@typescript-eslint/no-unused-vars": "error",
        "@typescript-eslint/member-delimiter-style": "off",
        "@typescript-eslint/explicit-function-return-type": "off"
    },
    "overrides": [
        {
            // enable the rule specifically for TypeScript files
            "files": [
                "*.ts",
                "*.tsx"
            ],
            "rules": {
                "@typescript-eslint/explicit-function-return-type": [
                    "error"
                ]
            }
        }
    ]
}