.eslintrc.json

{
  "root": true,
  "plugins": ["eslint-plugin", "@typescript-eslint", "jest"],
  "env": {
    "es6": true,
    "node": true
  },
  "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
  "rules": {
    "comma-dangle": ["error", "always-multiline"],
    "no-mixed-operators": "error",
    "no-console": "off",
    "no-undef": "off",
    "@typescript-eslint/indent": "off",
    "@typescript-eslint/no-explicit-any": "off",
    "@typescript-eslint/no-non-null-assertion": "off",
    "@typescript-eslint/explicit-function-return-type": "off",
    "@typescript-eslint/explicit-member-accessibility": "off",
    "@typescript-eslint/no-var-requires": "off",
    "@typescript-eslint/no-use-before-define": "off",
    "@typescript-eslint/no-object-literal-type-assertion": "off",
    "@typescript-eslint/no-parameter-properties": "off"
  },
  "parserOptions": {
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": false
    },
    "project": "./tsconfig.base.json"
  },
  "overrides": [
    {
      "files": [
        "packages/eslint-plugin-tslint/tests/**/*.ts",
        "packages/eslint-plugin/tests/**/*.test.ts",
        "packages/parser/tests/**/*.ts",
        "packages/typescript-estree/tests/**/*.ts"
      ],
      "env": {
        "jest/globals": true
      },
      "rules": {
        "jest/no-disabled-tests": "warn",
        "jest/no-focused-tests": "error",
        "jest/no-alias-methods": "error",
        "jest/no-identical-title": "error",
        "jest/no-jasmine-globals": "error",
        "jest/no-jest-import": "error",
        "jest/no-test-prefixes": "error",
        "jest/no-test-callback": "error",
        "jest/no-test-return-statement": "error",
        "jest/prefer-to-have-length": "warn",
        "jest/prefer-spy-on": "error",
        "jest/valid-expect": "error"
      }
    },
    {
      "files": [
        "packages/eslint-plugin/test/**/*.ts",
        "packages/eslint-plugin-tslint/tests/**/*.spec.ts"
      ],
      "rules": {
        "eslint-plugin/no-identical-tests": "error"
      }
    }
  ]
}