.eslintrc.json

{
  "root": true,
  "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended", "prettier", "plugin:prettier/recommended"],
  "env": {
    "es6": true,
    "node": true
  },
  "rules": {
    "prefer-spread": "off",
    "eqeqeq": "error"
  },
  "ignorePatterns": ["examples/**", "dist/**"],
  "overrides": [
    {
      "files": ["**/*.ts"],
      "parser": "@typescript-eslint/parser",
      "parserOptions": {
        "project": ["./tsconfig.build.json", "./tsconfig.spec.json"]
      },
      "plugins": ["@typescript-eslint", "prettier"],
      "rules": {
        "@typescript-eslint/no-unused-vars": ["warn", { "varsIgnorePattern": "^_" }],
        "@typescript-eslint/naming-convention": "error",
        "@typescript-eslint/no-floating-promises": "error",
        "@typescript-eslint/no-unnecessary-type-arguments": "error",
        "@typescript-eslint/no-non-null-assertion": "error",
        "@typescript-eslint/no-empty-interface": "error",
        "@typescript-eslint/restrict-plus-operands": "error",
        "@typescript-eslint/no-extra-non-null-assertion": "error",
        "@typescript-eslint/prefer-nullish-coalescing": "error",
        "@typescript-eslint/prefer-optional-chain": "error",
        "@typescript-eslint/ban-ts-comment": "error",
        "@typescript-eslint/prefer-includes": "error",
        "@typescript-eslint/prefer-for-of": "error",
        "@typescript-eslint/prefer-string-starts-ends-with": "error",
        "@typescript-eslint/prefer-readonly": "error",
        "@typescript-eslint/no-non-null-asserted-optional-chain": "error",
        "@typescript-eslint/await-thenable": "error",
        "@typescript-eslint/no-unnecessary-boolean-literal-compare": "error",
        "@typescript-eslint/switch-exhaustiveness-check": "error"
      }
    },
    {
      "files": ["test/*.ts"],
      "plugins": ["jest"],
      "env": {
        "jest/globals": true
      },
      "rules": {
        "@typescript-eslint/no-explicit-any": "off",
        "@typescript-eslint/no-var-requires": "off",
        "@typescript-eslint/ban-ts-comment": "warn",
        "@typescript-eslint/naming-convention": "off"
      }
    },
    {
      "files": ["**/*.js"],
      "env": {
        "browser": true
      },
      "rules": {}
    }
  ]
}