.eslintrc.json

{
  "env": {
    "browser": false,
    "node": true,
    "mocha": true,
    "es2020": true
  },
  "root": true,
  "parser": "@typescript-eslint/parser",
  "plugins": ["@typescript-eslint", "deprecation"],
  "parserOptions": {
    "project": "./tsconfig.eslint.json",
    "ext": ".ts"
  },
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/eslint-recommended",
    "plugin:@typescript-eslint/recommended",
    "prettier"
  ],
  "rules": {
    "no-console": "error",
    "no-prototype-builtins": "error",
    "one-var": ["error", "never"],
    "no-duplicate-imports": "error",
    "no-use-before-define": "error",
    "curly": "error",
    "eqeqeq": ["error", "smart"],
    "no-var": "error",
    "prefer-const": "error",
    "prefer-template": "error",
    "deprecation/deprecation": "error",
    "@typescript-eslint/no-non-null-assertion": "error",
    "@typescript-eslint/no-unused-vars": "error",
    "@typescript-eslint/no-this-alias": "error"
  }
}