.eslintrc.json

{
  "env": {
    "browser": false,
    "es6": true,
    "node": true
  },
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "project": "tsconfig.json",
    "sourceType": "module"
  },
  "overrides": [
    {
      "files": ["**/*.ts"] //ignore .js files
    }
  ],
  "plugins": ["@typescript-eslint", "jest"],
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/eslint-recommended",
    "plugin:@typescript-eslint/recommended",
    "prettier"
  ],
  "rules": {
    "quotes": ["error", "double"],
    "object-curly-spacing": ["error", "always"],
    "@typescript-eslint/explicit-function-return-type": "error",
    "no-var": "error",
    "padding-line-between-statements": [
      "error",
      { "blankLine": "always", "prev": "block-like", "next": "function" }
    ],
    "space-infix-ops": "error",
    "spaced-comment": "error",
    "arrow-spacing": "error",
    "@typescript-eslint/naming-convention": [
      "error", 
      {"selector": "enum", "format":["PascalCase"]},
      {"selector": "enumMember", "format":["UPPER_CASE"]},
      {"selector": "class","format":["PascalCase"]},
      {"selector": "interface","format":["PascalCase"]},
      {"selector": "typeAlias","format":["PascalCase"]},
      {"selector": "classProperty","format":["camelCase"], "leadingUnderscore":"allow"},
      {"selector": "objectLiteralProperty", "format":null},
      {"selector": "typeLike", "format":["PascalCase", "camelCase"]},
      {"selector": "variable", "modifiers": [ "const"], "format":["UPPER_CASE","camelCase"] , "filter": {"regex":"^_.*","match":false}},
      {"selector": "variable", "modifiers": ["exported", "const"], "format":["UPPER_CASE", "camelCase"]},
      {"selector": "default","format": ["strictCamelCase"], "leadingUnderscore": "allow" } //this must be the last rule
    ]
  }
}