.eslintrc.json

{
  "root": true,
  "env": {
    "es6": true,
    "node": true
  },
  "parserOptions": {
    "ecmaVersion": 2018
  },
  "extends": [
    "eslint:recommended"
  ],
  "plugins": ["import"],
  "rules": {
    "array-bracket-spacing": ["error", "never"],
    "block-spacing": ["error", "always"],
    "brace-style": ["error", "1tbs"],
    "comma-dangle": ["error", "never"],
    "import/no-unresolved": ["error", { "commonjs": true }],
    "import/extensions": ["error", "always", { "js": "never" }],
    "import/newline-after-import": ["error", { "count": 2 }],
    "indent": ["error", 2],
    "linebreak-style": ["error", "unix"],
    "no-trailing-spaces": "error",
    "no-tabs": "error",
    "no-unused-vars": ["error", { "argsIgnorePattern": "_.*" }],
    "object-curly-spacing": ["error", "always"],
    "quotes": ["error", "double", { "allowTemplateLiterals": true }],
    "semi": ["error", "always"]
  },
  "settings": {
    "import/resolver": "node"
  },
  "overrides": [
    {
      "files": ["**/*.ts"],
      "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:@typescript-eslint/recommended"
      ],
      "parserOptions": {
        "project": "./tsconfig.json"
      },
      "settings": {
        "import/resolver": "typescript"
      },
      "rules": {
        "import/extensions": ["error", "always", { "ts": "never" }],
        "@typescript-eslint/array-type": ["error"],
        "@typescript-eslint/consistent-type-definitions": ["error", "type"],
        "@typescript-eslint/member-delimiter-style": ["error"],
        "@typescript-eslint/no-misused-promises": "error",
        "@typescript-eslint/no-unnecessary-type-assertion": "error",
        "@typescript-eslint/no-unsafe-assignment": "warn",
        "@typescript-eslint/no-unsafe-call": "warn",
        "@typescript-eslint/no-unsafe-member-access": "warn",
        "@typescript-eslint/no-unsafe-return": "warn",
        "@typescript-eslint/restrict-plus-operands": "error"
      }
    }
  ]
}