.eslintrc.json

{
    "parser": "babel-eslint",
    "extends": [
        "eslint:recommended",
        "prettier"
    ],
    "plugins": [
        "import"
    ],
    "env": {
        "browser": false,
        "node": true,
        "jest": true,
        "es6": true
    },
    "parserOptions": {
        "ecmaVersion": 2018,
        "sourceType": "module"
    },
    "overrides": [
        {
            "files": [
                "**/*.ts"
            ],
            "parser": "@typescript-eslint/parser",
            "parserOptions": {
                "ecmaVersion": 2018,
                "sourceType": "module",
                "warnOnUnsupportedTypeScriptVersion": true,
                "project": "./tsconfig.json"
            },
            "extends": [
                "plugin:@typescript-eslint/recommended",
                "prettier",
                "prettier/@typescript-eslint"
            ],
            "plugins": [
                "@typescript-eslint"
            ],
            "rules": {
                "default-case": "off",
                "no-dupe-class-members": "off",
                "no-undef": "off",
                "no-array-constructor": "off",
                "@typescript-eslint/no-array-constructor": "error",
                "no-use-before-define": "off",
                "@typescript-eslint/no-use-before-define": [
                    "error",
                    {
                        "functions": false,
                        "classes": false,
                        "variables": false,
                        "typedefs": false
                    }
                ],
                "@typescript-eslint/no-non-null-assertion": "off",
                "@typescript-eslint/no-explicit-any": "off",
                "@typescript-eslint/no-object-literal-type-assertion": "off",
                "@typescript-eslint/explicit-member-accessibility": "off",
                "no-unused-vars": "off",
                "@typescript-eslint/no-unused-vars": [
                    "error",
                    {
                        "args": "none",
                        "ignoreRestSiblings": true
                    }
                ],
                "no-useless-constructor": "off",
                "@typescript-eslint/no-useless-constructor": "error",
                "@typescript-eslint/explicit-function-return-type": "off",
                "@typescript-eslint/prefer-interface": "off",
                "@typescript-eslint/no-namespace": "off"
            }
        }
    ]
}