.eslintrc.json

{
  "parser": "@typescript-eslint/parser",
  "plugins": ["@typescript-eslint", "prettier"],
  "env": {
    "es6": true,
    "node": true
  },
  "extends": [
    "plugin:@typescript-eslint/recommended",
    "prettier",
    "plugin:prettier/recommended"
  ],
  "globals": {
    "Atomics": "readonly",
    "SharedArrayBuffer": "readonly"
  },
  "parserOptions": {
    "ecmaVersion": 2018,
    "sourceType": "module",
    "project": "./tsconfig.json"
  },
  "rules": {
    "quotes": [
      "off"
    ],
    "eqeqeq": [
      "warn", "always"
    ],
    "no-process-env": [
      "warn"
    ],
    "no-var": [
      "warn"
    ],
    "sort-imports": [
      "off"
    ],
    "func-style": [
      "error",
      "expression"
    ],
    "prefer-arrow-callback": [
      "error"
    ],
    "@typescript-eslint/explicit-function-return-type": [
      "off",
      {
        "allowTypedFunctionExpressions": true,
        "allowExpressions": true
      }
    ],
    "@typescript-eslint/await-thenable": [
      "warn"
    ],
    "@typescript-eslint/no-use-before-define": [
      "off"
    ],
    "@typescript-eslint/explicit-module-boundary-types": [
      "off"
    ],
    "@typescript-eslint/no-angle-bracket-type-assertion": [
      "off"
    ],
    "@typescript-eslint/no-require-imports": [
      "warn"
    ],
    "@typescript-eslint/no-unnecessary-type-assertion": [
      "warn"
    ],
    "@typescript-eslint/no-unused-vars": [
      "warn",
      {
        "argsIgnorePattern": "^_"
      }
    ],
    "@typescript-eslint/prefer-string-starts-ends-with": [
      "warn"
    ],
    "@typescript-eslint/interface-name-prefix": [
      "off"
    ],
    "@typescript-eslint/prefer-interface": ["off"],
    "@typescript-eslint/explicit-member-accessibility": [
      "warn",
      {
        "accessibility": "no-public"
      }
    ],
    "@typescript-eslint/no-misused-promises": [
      "error"
    ],
    "@typescript-eslint/no-floating-promises": [
      "error"
    ],
    "@typescript-eslint/consistent-type-assertions": ["off"],
    "@typescript-eslint/no-non-null-assertion": ["off"],
    "prettier/prettier": [
      "warn",
      {
        "trailingComma": "all",
        "singleQuote": true,
        "printWidth": 140,
        "tabWidth": 2,
        "arrowParens": "always"
      },
      {
        "usePrettierrc": false
      }
    ]
  },
  "overrides": [
    {
      "files": ["*.spec.ts", "src/**/*.ts", "types/**/*.ts"],
      "excludedFiles": ["lib/*"],
      "rules": {
        "@typescript-eslint/explicit-function-return-type": "off"
      }
    }
  ]
}