.eslintrc.json

{
  "extends": ["eslint:recommended", "prettier"],
  "env": {
    "node": true,
    "es6": true
  },
  "rules": {
    "eqeqeq": [2, "smart"],
    "no-caller": 2,
    "dot-notation": 2,
    "no-var": 2,
    "prefer-const": 2,
    "prefer-arrow-callback": [2, { "allowNamedFunctions": true }],
    "arrow-body-style": [2, "as-needed"],
    "object-shorthand": 2,
    "prefer-template": 2,
    "one-var": [2, "never"],
    "prefer-destructuring": [2, { "object": true }],
    "capitalized-comments": 2,
    "multiline-comment-style": [2, "starred-block"],
    "spaced-comment": 2,
    "yoda": [2, "never"],
    "curly": [2, "multi-line"],
    "no-else-return": 2
  },
  "overrides": [
    {
      "files": "*.ts",
      "extends": [
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:@typescript-eslint/recommended",
        "prettier"
      ],
      "parserOptions": {
        "sourceType": "module",
        "project": "./tsconfig.eslint.json"
      },
      "rules": {
        "@typescript-eslint/no-use-before-define": [2, { "functions": false }],
        "@typescript-eslint/consistent-type-definitions": [2, "interface"],
        "@typescript-eslint/prefer-function-type": 2,
        "@typescript-eslint/no-unnecessary-type-arguments": 2,
        "@typescript-eslint/prefer-string-starts-ends-with": 2,
        "@typescript-eslint/prefer-readonly": 2,
        "@typescript-eslint/prefer-includes": 2,
        "@typescript-eslint/no-unnecessary-condition": 2,
        "@typescript-eslint/switch-exhaustiveness-check": 2,
        "@typescript-eslint/prefer-nullish-coalescing": 2
      }
    }
  ]
}