.eslintrc.json

{
  "overrides": [
    {
      "files": "*.js",
      "env": {
        "es6": true,
        "node": true
      },
      "extends": [
        "eslint:recommended",
        "prettier"
      ],
      "parser": "babel-eslint",
      "plugins": [
        "prettier"
      ],
      "rules": {
        "prettier/prettier": "error"
      }
    },
    {
      "files": "*.ts",
      "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:@typescript-eslint/recommended",
        "prettier",
        "prettier/@typescript-eslint"
      ],
      "parser": "@typescript-eslint/parser",
      "plugins": [
        "@typescript-eslint",
        "prettier"
      ],
      "rules": {
        "@typescript-eslint/explicit-function-return-type": "off",
        "@typescript-eslint/explicit-member-accessibility": "off",
        "prettier/prettier": "error"
      }
    }
  ]
}