.eslintrc.json

{
  "extends": ["plugin:@typescript-eslint/recommended", "plugin:import/typescript", "opencollective"],
  "parser": "@typescript-eslint/parser",
  "env": { "mocha": true },
  "plugins": ["mocha", "simple-import-sort"],
  "rules": {
    // console logs are OK in Node
    "no-console": "off",
    "mocha/no-exclusive-tests": "error",
    // use es6 module imports and exports
    "import/no-commonjs": "error",
    // common warnings in the codebase
    "no-process-exit": "off",
    "node/shebang": "off",
    "no-useless-escape": "off",
    "prefer-rest-params": "off",
    // relaxing because we have many errors
    "require-atomic-updates": "off",
    // typescript
    "node/no-missing-import": ["error", { "tryExtensions": [".js", ".ts"] }],
    // enforce strictly camelcase
    "camelcase": "error",
    // simple-import-sort
    "simple-import-sort/sort": [
      "warn",
      {
        "groups": [
          // Side effect imports.
          ["^\\u0000"],
          // Node.js builtins. You could also generate this regex if you use a `.js` config.
          // For example: `^(${require("module").builtinModules.join("|")})(/|$)`
          [
            "^(_http_agent|_http_client|_http_common|_http_incoming|_http_outgoing|_http_server|_stream_duplex|_stream_passthrough|_stream_readable|_stream_transform|_stream_wrap|_stream_writable|_tls_common|_tls_wrap|assert|async_hooks|buffer|child_process|cluster|console|constants|crypto|dgram|dns|domain|events|fs|http|http2|https|inspector|module|net|os|path|perf_hooks|process|punycode|querystring|readline|repl|stream|string_decoder|sys|timers|tls|trace_events|tty|url|util|v8|vm|worker_threads|zlib)(/|$)"
          ],
          // Packages.
          // Things that start with a letter (or digit or underscore), or `@` followed by a letter.
          ["^@?\\w"],
          // Absolute imports and other imports such as Vue-style `@/foo`.
          // Anything that does not start with a dot.
          ["^[^.]"],
          // Parent imports. Put `..` last.
          ["^\\.\\.(?!/?$)", "^\\.\\./?$"],
          // Other relative imports. Put same-folder imports and `.` last.
          ["^\\./(?=.*/)(?!/?$)", "^\\.(?!/?$)", "^\\./?$"]
        ]
      }
    ]
  },
  // Disable typescript checks in JS
  "overrides": [
    {
      "files": ["*.js"],
      "rules": {
        "@typescript-eslint/camelcase": "off",
        "@typescript-eslint/no-use-before-define": "off",
        "@typescript-eslint/indent": "off",
        "@typescript-eslint/explicit-function-return-type": "off"
      }
    }
  ],
  "settings": {
    // Ignore .d.ts files for import (they just define the types)
    "import/ignore": [".d.ts$"]
  }
}