.eslintrc.json

{
  "root": true,
  "env": {
    "browser": true,
    "es6": true,
    "node": true,
    "mocha": true
  },
  "parser": "@typescript-eslint/parser",
  "plugins": ["@typescript-eslint", "prettier"],
  "globals": {
    "app": true,        // BitGo side-effect from testutil
    "ethUtil": true,    // BitGo side-effect from testutil
    "requireCommon": true
  },
  "extends": [
    "plugin:@typescript-eslint/recommended",
    "plugin:prettier/recommended"
  ],
  "parserOptions": {
    "ecmaVersion": 6
  },
  "rules": {
    "@typescript-eslint/explicit-function-return-type": "off",
    "@typescript-eslint/explicit-member-accessibility": "off",
    "@typescript-eslint/no-this-alias": "warn",
    "@typescript-eslint/no-use-before-define": "off",
    "@typescript-eslint/no-var-requires": "off",
    "array-bracket-spacing": ["error", "never"],
    "arrow-spacing": ["error", { "before": true, "after": true }],
    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
    "comma-dangle": ["warn", "always-multiline"],
    "comma-spacing": ["error", { "before": false, "after": true }],
    "curly": ["error", "multi-line"],
    "eol-last": "error",
    "eqeqeq": ["warn", "always"],
    "func-call-spacing": ["error", "never"],
    "func-names": "off",
    "indent": ["warn", 2, {"SwitchCase": 1, "MemberExpression": 1}],
    "key-spacing": ["error", { "beforeColon": false, "afterColon": true, "mode": "strict" }],
    "keyword-spacing": ["error"],
    "linebreak-style": ["error", "unix"],
    "no-compare-neg-zero": "error",
    "no-console": "warn",
    "no-dupe-args": "error",
    "no-dupe-keys": "error",
    "no-duplicate-imports": "error",  // whilst imports are not being used, if we start to use them, we do not want duplicates
    "no-empty": ["warn", { "allowEmptyCatch": false }],
    "no-extra-boolean-cast": "off",
    "no-extra-semi": "error",
    "no-fallthrough": "error",
    "no-inner-declarations": "off",
    "no-mixed-spaces-and-tabs": "error",
    "no-multi-spaces": ["error", {"ignoreEOLComments": true}],
    "no-multiple-empty-lines": ["error", { "max": 2, "maxEOF": 1 }],
    "no-octal": "error",
    "no-path-concat": "off",
    "no-process-env": "off",
    "no-process-exit": "off",
    "no-redeclare": ["error", { "builtinGlobals": true }],
    "no-sync": "warn",
    "no-trailing-spaces": ["warn", { "skipBlankLines": true, "ignoreComments": true }],
    "no-undef": "error",
    "no-unneeded-ternary": "error",
    "no-unreachable": "error",
    "@typescript-eslint/no-unused-vars": ["error", {"vars": "all", "args": "none"}],
    "no-useless-escape": "off",
    "no-var": "error",
    "object-curly-spacing": ["error", "always", {"objectsInObjects": true, "arraysInObjects": true}],
    "prefer-const": "error",
    "prefer-rest-params": "warn",
    "prefer-spread": "warn",
    "quote-props": ["error", "as-needed"],
    "quotes": ["error", "single", { "avoidEscape": true, "allowTemplateLiterals": true }],
    "radix": "error",
    "require-yield": "off",
    "semi": ["error", "always"],
    "space-before-blocks": ["error"],
    "space-infix-ops": ["error"],
    "spaced-comment": ["error", "always"],
    "switch-colon-spacing": ["error", {"before": false, "after": true}],
    "yield-star-spacing": ["error", {"before": true, "after": false}]
  },
  "overrides": [
    {
      // tsc already checks for usage of undefined variables better than eslint can,
      // so there's no need to enable this rule for typescript files.
      // https://github.com/typescript-eslint/typescript-eslint/blob/master/docs/getting-started/linting/FAQ.md#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors
      "files": ["*.ts"],
      "rules": {
        "no-undef": "off"
      }
    }
  ]
}