.eslintrc.json

{
  "env": {
    "browser": true,
    "commonjs": true,
    "es2021": true,
    "jest": true,
    "jasmine": true
  },
  "extends": [
    "eslint:recommended",
    "airbnb-base",
    "plugin:import/errors",
    "plugin:import/warnings",
    "plugin:import/typescript",
    "prettier", // make sure this is second to last
    "plugin:prettier/recommended" // Enables eslint-plugin-prettier and eslint-config-prettier. This will display prettier errors as ESLint errors. Make sure this is always the last configuration in the extends array.
  ],
  "plugins": ["promise", "prettier"],
  "ignorePatterns": ["**/build/**"],
  "parserOptions": {
    "ecmaVersion": 2020,
    "sourceType": "module"
  },
  "settings": {
    "import/resolver": {
      "node": {
        "extensions": [".js", ".jsx", ".ts", ".tsx"]
      },
      "typescript": {}
    }
  },
  "rules": {
    "prettier/prettier": ["error", {}, { "editorconfig": true, "usePrettierrc": true }],

    "import/no-extraneous-dependencies": [
      "error",
      { "devDependencies": ["**/test/**", "**/*.test.js", "**/*.spec.js", "**/.devsupport/**"] }
    ],

    "import/extensions": [
      "warn",
      "ignorePackages",
      {
        "js": "never",
        "jsx": "never",
        "ts": "never",
        "tsx": "never"
      }
    ]
  },
  "overrides": [
    {
      "files": ["**/*.ts", "**/*.tsx"],
      "plugins": ["@typescript-eslint", "unused-imports", "prettier"],

      "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:import/typescript",

        "prettier", // make sure this is second to last
        "plugin:prettier/recommended" // Enables eslint-plugin-prettier and eslint-config-prettier. This will display prettier errors as ESLint errors. Make sure this is always the last configuration in the extends array.
      ],
      "parser": "@typescript-eslint/parser",
      "parserOptions": {
        "project": ["./tsconfig.test.json"]
      },
      "rules": {
        "prettier/prettier": [
          "error",
          { "printWidth": 115 },
          { "editorconfig": true, "usePrettierrc": true }
        ],
        "@typescript-eslint/no-explicit-any": 0,
        "no-console": "off", // since our test app is just console
        "no-unused-vars": "off", // use the other below
        "unused-imports/no-unused-imports": "error",
        "unused-imports/no-unused-vars": [
          "warn",
          {
            "vars": "all",
            "varsIgnorePattern": "^_",
            "args": "after-used",
            "argsIgnorePattern": "^_"
          }
        ],
        "no-shadow": "off",
        "@typescript-eslint/no-shadow": "error",
        "no-useless-constructor": "off",
        "@typescript-eslint/no-useless-constructor": ["error"],
        "no-empty-function": "off",
        "@typescript-eslint/no-empty-function": ["error"],
        "import/prefer-default-export": "off", // this doesn't work nice with js/ts mix
        "import/no-extraneous-dependencies": [
          "error",
          { "devDependencies": ["**/test/**", "**/*.test.ts", "**/*.spec.ts"] }
        ]
      }
    }
  ]
}