.eslintrc.js

const TypescriptRules = {
  "@typescript-eslint/no-redeclare": "off",
  "@typescript-eslint/no-type-alias": "off",
  "@typescript-eslint/strict-boolean-expressions": "off",
  "@typescript-eslint/prefer-readonly-parameter-types": "off",
  "@typescript-eslint/consistent-type-imports": "off",
  "@typescript-eslint/no-unnecessary-condition": "off",
  "@typescript-eslint/explicit-function-return-type": "off",
  "@typescript-eslint/explicit-module-boundary-types": "off",
  "@typescript-eslint/explicit-member-accessibility": [
    "error",
    {
      accessibility: "explicit",
      overrides: {
        constructors: "off",
      },
    },
  ],
  "@typescript-eslint/naming-convention": [
    "error",
    {
      selector: "default",
      format: ["camelCase"],
      leadingUnderscore: "allow",
    },
    {
      selector: "variable",
      format: ["camelCase", "PascalCase", "UPPER_CASE"],
    },
    {
      selector: "parameter",
      format: ["camelCase"],
      leadingUnderscore: "allow",
    },
    {
      selector: "enumMember",
      format: ["UPPER_CASE"],
    },
    {
      selector: "typeLike",
      format: ["PascalCase"],
    },
    {
      selector: "memberLike",
      modifiers: ["protected"],
      format: ["camelCase", "PascalCase", "UPPER_CASE"],
      leadingUnderscore: "require",
    },
    {
      selector: "objectLiteralProperty",
      format: ["camelCase", "PascalCase"],
    },
  ],
  "import/order": [
    "error",
    {
      groups: ["builtin", "external", "internal", ["index", "sibling", "parent"], "object", "type"],
      "newlines-between": "always",
      alphabetize: {
        order: "asc",
        caseInsensitive: true,
      },
    },
  ],
  "import/no-default-export": "off",
  "@typescript-eslint/no-magic-numbers": ["error", { ignore: [-1, 0, 1] }],
};

module.exports = {
  env: {
    node: true,
    browser: true,
  },
  extends: ["eslint:recommended", "plugin:prettier/recommended", "plugin:import/recommended"],
  globals: {
    fetch: true,
    FormData: true,
  },
  settings: {
    "import/resolver": {
      typescript: {},
    },
  },
  parser: "@typescript-eslint/parser",
  plugins: ["@typescript-eslint", "jest", "json", "prettier"],
  parserOptions: {
    sourceType: "module",
    ecmaVersion: 10,
    ecmaFeatures: {
      jsx: true,
    },
    project: "./tsconfig.eslint.json",
  },
  overrides: [
    {
      files: ["**/*.{js,jsx}"],
      rules: {
        "no-unused-vars": "error",
        "no-console": "off",
      },
    },
    {
      files: ["**/*.{ts,tsx}"],
      extends: [
        "eslint:recommended",
        "plugin:@typescript-eslint/all",
        "plugin:prettier/recommended",
        "plugin:import/recommended",
        "plugin:import/typescript",
      ],
      rules: {
        ...TypescriptRules,
        "no-unused-vars": "error",
        "no-console": "off",
      },
    },
    {
      files: ["*.{spec,test}.{js,jsx}", "**/__tests__/**/*.{js,jsx}"],
      env: {
        jest: true,
        "jest/globals": true,
      },
      rules: {
        "max-nested-callbacks": "off",
      },
    },
    {
      files: ["*.{spec,test}.{ts,tsx}", "**/__tests__/**/*.{ts,tsx}"],
      env: {
        jest: true,
        "jest/globals": true,
      },
      extends: [
        "eslint:recommended",
        "plugin:@typescript-eslint/all",
        "plugin:prettier/recommended",
        "plugin:import/recommended",
        "plugin:import/typescript",
      ],
      rules: {
        ...TypescriptRules,
        "max-nested-callbacks": "off",
        "@typescript-eslint/no-extraneous-class": "off",
        "@typescript-eslint/no-magic-numbers": "off",
      },
    },
  ],
  rules: {
    "prettier/prettier": "error",
    "@typescript-eslint/no-var-requires": "error",
    "@typescript-eslint/no-explicit-any": "error",
    "@typescript-eslint/no-unused-vars": "error",
    "@typescript-eslint/ban-ts-comment": "off",
    "@typescript-eslint/explicit-module-boundary-types": "off",
  },
};