.eslintrc.js

module.exports = {
  root: true,
  env: {
    browser: true,
    es6: true,
    node: true,
    mocha: true,
  },
  globals: {
    BigInt: true,
  },
  parser: "@typescript-eslint/parser",
  parserOptions: {
    ecmaVersion: 10,
    project: "./tsconfig.json",
  },
  plugins: ["@typescript-eslint", "eslint-plugin-import", "eslint-plugin-node", "no-only-tests", "prettier"],
  extends: [
    "eslint:recommended",
    "plugin:import/errors",
    "plugin:import/warnings",
    "plugin:import/typescript",
    "plugin:@typescript-eslint/recommended",
  ],
  rules: {
    "prettier/prettier": "error",
    //doesnt work, it reports false errors
    "constructor-super": "off",
    "@typescript-eslint/await-thenable": "error",
    "@typescript-eslint/naming-convention": [
      "error",
      {selector: "default", format: ["camelCase"]},
      {
        selector: ["classProperty", "objectLiteralProperty", "classMethod", "parameter"],
        format: ["camelCase"],
        leadingUnderscore: "allow",
      },
      //variable must be in camel or upper case
      {selector: "variable", format: ["camelCase", "UPPER_CASE"], leadingUnderscore: "allow"},
      //classes and types must be in PascalCase
      {selector: ["typeLike", "enum"], format: ["PascalCase"]},
      {selector: "enumMember", format: null},
      //interface must start with I
      {selector: "interface", format: ["PascalCase"], prefix: ["I"]},
      //ignore rule for quoted stuff
      {
        selector: [
          "classProperty",
          "objectLiteralProperty",
          "typeProperty",
          "classMethod",
          "objectLiteralMethod",
          "typeMethod",
          "accessor",
          "enumMember",
        ],
        format: null,
        modifiers: ["requiresQuotes"],
      },
      //ignore rules on destructured params
      {
        selector: "variable",
        modifiers: ["destructured"],
        format: null,
      },
    ],
    "@typescript-eslint/explicit-function-return-type": [
      "error",
      {
        allowExpressions: true,
      },
    ],
    "@typescript-eslint/func-call-spacing": "error",
    "@typescript-eslint/member-ordering": "error",
    "@typescript-eslint/no-explicit-any": "error",
    "@typescript-eslint/no-require-imports": "error",
    "@typescript-eslint/no-unused-vars": [
      "error",
      {
        varsIgnorePattern: "^_",
      },
    ],
    "@typescript-eslint/ban-ts-comment": "warn",
    "@typescript-eslint/no-use-before-define": "off",
    "@typescript-eslint/semi": "error",
    "@typescript-eslint/type-annotation-spacing": "error",
    "@typescript-eslint/no-floating-promises": "error",
    "@typescript-eslint/explicit-member-accessibility": ["error", {accessibility: "no-public"}],
    "import/no-extraneous-dependencies": [
      "error",
      {
        devDependencies: false,
        optionalDependencies: false,
        peerDependencies: false,
      },
    ],
    "func-call-spacing": "off",
    //if --fix is run it messes imports like /lib/presets/minimal & /lib/presets/mainnet
    "import/no-duplicates": "off",
    "node/no-deprecated-api": "error",
    "new-parens": "error",
    "no-caller": "error",
    "no-bitwise": "off",
    "no-cond-assign": "error",
    "no-consecutive-blank-lines": 0,
    "no-console": "warn",
    "no-var": "error",
    "object-curly-spacing": ["error", "never"],
    "object-literal-sort-keys": 0,
    "no-prototype-builtins": 0,
    "prefer-const": "error",
    quotes: ["error", "double"],
    semi: "off",

    // Prevents accidentally pushing a commit with .only in Mocha tests
    "no-only-tests/no-only-tests": "error",
  },
  overrides: [
    {
      files: ["**/test/**/*.ts"],
      rules: {
        "import/no-extraneous-dependencies": "off",
        "@typescript-eslint/no-explicit-any": "off",
      },
    },
    {
      files: ["**/lodestar-types/**/*.ts"],
      rules: {
        "@typescript-eslint/naming-convention": [
          "off",
          {selector: "interface", prefix: ["I"]},
          {selector: "interface", format: ["PascalCase"], prefix: ["I"]},
        ],
      },
    },
  ],
};