.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": 2020,
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": true
    }
  },
  "env": {
    "es2017": true,
    "browser": true,
    "node": true,
    "jest/globals": true
  },
  "settings": {
    "react": {
      "version": "detect"
    }
  },
  "overrides": [
    {
      "files": [
        "**/*.js",
        "**/*.jsx"
      ],
      "plugins": [
        "no-useless-assign"
      ],
      "extends": [
        "eslint:recommended",
        "plugin:import/recommended",
        "plugin:jest/recommended",
        "plugin:node/recommended-module",
        "plugin:promise/recommended",
        "plugin:react/recommended",
        "prettier"
      ],
      "rules": {
        "import/extensions": "error"
      }
    },
    {
      "files": [
        "**/*.ts",
        "**/*.tsx"
      ],
      "parser": "@typescript-eslint/parser",
      "parserOptions": {
        "project": "./tsconfig.dev.json"
      },
      "plugins": [
        "no-useless-assign"
      ],
      "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/recommended",
        "plugin:import/recommended",
        "plugin:import/typescript",
        "plugin:jest/recommended",
        "plugin:node/recommended-module",
        "plugin:promise/recommended",
        "plugin:react/recommended",
        "prettier"
      ],
      "rules": {
        "import/extensions": "error",
        "import/namespace": [
          "error",
          {
            "allowComputed": true
          }
        ],
        "jest/no-disabled-tests": "off",
        "no-useless-assign/no-useless-assign": "warn",
        "node/no-missing-import": "off",
        "node/no-unpublished-import": "off"
      }
    },
    {
      "files": [
        "integration/**"
      ],
      "parserOptions": {
        "project": "./integration/tsconfig.json"
      },
      "rules": {
        "@typescript-eslint/no-unused-vars": "off",
        "jest/no-standalone-expect": "off",
        "no-empty-pattern": "off",
        "no-useless-assign/no-useless-assign": "warn"
      }
    }
  ],
  "rules": {
    "node/no-extraneous-import": [
      "error",
      {
        "allowModules": [
          "@jest/types",
          "lodash"
        ]
      }
    ]
  }
}