.eslintrc.json

{
  "root": true,
  "env": {
    "node": true,
    "browser": "true",
    "mocha": true
  },
  "parserOptions": {
    "ecmaVersion": 2020
  },
  "extends": [
    "eslint:recommended"
  ],
  "plugins": ["import"],
  "rules": {
    "array-bracket-spacing": ["error", "never"],
    "block-spacing": ["error", "always"],
    "brace-style": ["error", "1tbs"],
    "comma-dangle": ["error", "never"],
    "comma-spacing": "error",
    "default-param-last": "error",
    "func-call-spacing": "error",
    "import/no-unresolved": ["error", { "commonjs": true }],
    "import/extensions": ["error", "always", { "js": "never" }],
    "import/newline-after-import": ["error", { "count": 2 }],
    "indent": ["error", 2, { "ignoreComments": true, "SwitchCase": 1 }],
    "keyword-spacing": "error",
    "linebreak-style": ["error", "unix"],
    "no-loss-of-precision": "error",
    "no-prototype-builtins": ["off"],
    "no-return-await": "error",
    "no-trailing-spaces": "error",
    "no-tabs": "error",
    "no-throw-literal": "error",
    "no-unused-expressions": "error",
    "no-unused-vars": ["error", { "argsIgnorePattern": "_.*" }],
    "object-curly-spacing": ["error", "always"],
    "quotes": ["error", "double", { "allowTemplateLiterals": true }],
    "semi": ["error", "always"],
    "space-before-function-paren": ["error", { "named": "never" }],
    "space-infix-ops": "error"
  },
  "settings": {
    "import/resolver": "node"
  },
  "overrides": [
    {
      "files": ["**/*.ts"],
      "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:@typescript-eslint/recommended",
        "plugin:@typescript-eslint/recommended-requiring-type-checking"
      ],
      "parserOptions": {
        "project": "./tsconfig.json"
      },
      "settings": {
        "import/resolver": "typescript"
      },
      "rules": {
        "no-prototype-builtins": ["off"],
        "import/extensions": ["error", "always", { "ts": "never" }],
        "@typescript-eslint/array-type": "error",
        "brace-style": "off",
        "@typescript-eslint/brace-style": ["error", "1tbs"],
        "comma-dangle": "off",
        "@typescript-eslint/comma-dangle": ["error", "never"],
        "comma-spacing": "off",
        "@typescript-eslint/comma-spacing": "error",
        "@typescript-eslint/consistent-type-assertions": "error",
        "@typescript-eslint/consistent-type-definitions": ["error", "type"],
        "@typescript-eslint/consistent-type-imports": "error",
        "default-param-last": "off",
        "@typescript-eslint/default-param-last": "error",
        "func-call-spacing": "off",
        "@typescript-eslint/func-call-spacing": "error",
        "indent": "off",
        "@typescript-eslint/indent": ["error", 2, { "ignoreComments": true }],
        "keyword-spacing": "off",
        "@typescript-eslint/keyword-spacing": "error",
        "@typescript-eslint/method-signature-style": "error",
        "@typescript-eslint/no-base-to-string": "error",
        "@typescript-eslint/no-confusing-void-expression": "error",
        "@typescript-eslint/no-implicit-any-catch": "error",
        "no-loss-of-precision": "off",
        "@typescript-eslint/no-loss-of-precision": "error",
        "@typescript-eslint/no-meaningless-void-operator": "error",
        "no-throw-literal": "off",
        "@typescript-eslint/no-throw-literal": "error",
        "@typescript-eslint/no-unnecessary-boolean-literal-compare": "error",
        "@typescript-eslint/no-unnecessary-condition": "error",
        "@typescript-eslint/no-unnecessary-qualifier": "error",
        "@typescript-eslint/no-unnecessary-type-arguments": "error",
        "@typescript-eslint/no-unnecessary-type-constraint": "error",
        "@typescript-eslint/no-unsafe-argument": "warn",
        "@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/no-unused-vars": ["error", { "argsIgnorePattern": "_.*" }],
        "no-unused-expressions": "off",
        "@typescript-eslint/no-unused-expressions": "error",
        "@typescript-eslint/non-nullable-type-assertion-style": "error",
        "object-curly-spacing": "off",
        "@typescript-eslint/object-curly-spacing": ["error", "always"],
        "@typescript-eslint/prefer-for-of": "error",
        "@typescript-eslint/prefer-reduce-type-parameter": "error",
        "quotes": "off",
        "@typescript-eslint/quotes": ["error", "double", { "allowTemplateLiterals": true }],
        "no-return-await": "off",
        "@typescript-eslint/require-await": ["off"],
        "@typescript-eslint/return-await": "error",
        "semi": "off",
        "@typescript-eslint/semi": ["error", "always"],
        "space-before-function-paren": "off",
        "@typescript-eslint/space-before-function-paren": ["error", { "named": "never" }],
        "space-infix-ops": "off",
        "@typescript-eslint/space-infix-ops": "error",
        "@typescript-eslint/type-annotation-spacing": "error"
      }
    }
  ]
}