.eslintrc.json

// `npx eslint --print-config index.js` to print calculated config.
{
  "root": true,
  "parserOptions": {
    "ecmaVersion": 2022, // Top-level await, etc.
    "sourceType": "module",
    "ecmaFeatures": {
    }
  },
  "env": {
    "node": true,
    "es2022": true // Defines `Promise`, etc.
  },
  "extends": [
    "eslint:recommended",
    "plugin:prettier/recommended"
  ],
  "plugins": [
    "import",
    "license-header",
    "prettier",
    "promise",
    "n"
  ],
  "rules": {
    "license-header/header": ["error", "./dev-utils/license-header.js"],

    // Retoring some config from standardjs that we want to maintain at least
    // for now -- to assist with transition to prettier.
    "no-unused-vars": [ // See taav for possible better 'no-unused-vars' rule.
      "error",
      {
        "args": "none",
        "caughtErrors": "none",
        "ignoreRestSiblings": true,
        "vars": "all"
      }
    ],
    "no-empty": [
      "error",
      {
        "allowEmptyCatch": true
      }
    ],
    "no-constant-condition": [
      "error",
      {
        "checkLoops": false
      }
    ],
    "n/handle-callback-err": [
      "error",
      "^(err|error)$"
    ],
    "n/no-callback-literal": [
      "error"
    ],
    "n/no-deprecated-api": [
      "error"
    ],
    "n/no-exports-assign": [
      "error"
    ],
    "n/no-new-require": [
      "error"
    ],
    "n/no-path-concat": [
      "error"
    ],
    "n/process-exit-as-throw": [
      "error"
    ],
    "promise/param-names": [
      "error"
    ],

    // Undo this config from eslint:recommended for now (standardjs didn't have it.)
    "require-yield": [ "off" ],

    "import/export": "error",
    "import/first": "error",
    "import/no-absolute-path": ["error", { "esmodule": true, "commonjs": true, "amd": false }],
    "import/no-duplicates": "error",
    "import/no-named-default": "error",
    "import/no-webpack-loader-syntax": "error"
  },
  "ignorePatterns": [
    "/*.example.js", // a pattern for uncommited local dev files to avoid linting
    "/*.example.mjs", // a pattern for uncommited local dev files to avoid linting
    "/.nyc_output",
    "/build",
    "node_modules",
    "elastic-apm-node.js",
    "/examples/esbuild/dist",
    "/examples/typescript/dist",
    "/examples/nextjs",
    "/examples/an-azure-function-app",
    "/lib/opentelemetry-bridge/opentelemetry-core-mini",
    "/test/babel/out.js",
    "/test/lambda/fixtures/esbuild-bundled-handler/hello.js",
    "/test/instrumentation/modules/next/a-nextjs-app/pages",
    "/test/instrumentation/modules/next/a-nextjs-app/components",
    "/test/sourcemaps/fixtures/lib",
    "/test/sourcemaps/fixtures/src",
    "/test/stacktraces/fixtures/dist",
    "/test/types/transpile/index.js",
    "/test/types/transpile-default/index.js",
    "/test_output",
    "tmp"
  ]
}