@eslint/js 9.20.0: configs.all, configs.recommended

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:npm/@eslint/js@9.20.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40eslint/js@9.20.0
Demonstrate these symbols/APIs:
  - configs.all
  - configs.recommended

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:7e4a51fa1d9501fa3a8e454fc4972d50f75332a93fbe2928960170f65115de0d","contract":["configs.recommended provides an ESLint flat configuration object containing recommended rules","configs.all provides an ESLint flat configuration object containing all core JavaScript rules"],"goal":"verify pkg:npm/@eslint/js@9.20.0","kind":"HOW","packages":["pkg:npm/%40eslint/js@9.20.0"],"schemaVersion":1,"symbols":["configs.all","configs.recommended"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40eslint/js@9.20.0"],"schemaVersion":1,"subject":"pkg:npm/%40eslint/js@9.20.0","symbols":["configs.all","configs.recommended"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-eslint-js",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-eslint-js",
      "version": "1.0.0",
      "dependencies": {
        "@eslint/js": "9.20.0"
      }
    },
    "node_modules/@eslint/js": {
      "version": "9.20.0",
      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.20.0.tgz",
      "integrity": "sha512-iZA07H9io9Wn836aVTytRaNqh00Sad+EamwOVJT12GTLw1VGMFV/4JaME+JjLtr9fiGaoWgYnS54wrfWsSs4oQ==",
      "license": "MIT",
      "engines": {
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      }
    }
  }
}

{
  "name": "sample-eslint-js",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "@eslint/js": "9.20.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/@eslint/js@9.20.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40eslint/js@9.20.0"
  ],
  "symbols": [
    "configs.all",
    "configs.recommended"
  ]
}

import js from '@eslint/js';

export function getRecommendedConfig() {
  return js.configs.recommended;
}

export function getAllConfig() {
  return js.configs.all;
}

export function getRecommendedRules() {
  return js.configs.recommended.rules;
}

export function getAllRules() {
  return js.configs.all.rules;
}

export function getPackageMeta() {
  return js.meta;
}

import assert from 'node:assert/strict';
import js from '@eslint/js';
import { getRecommendedConfig, getAllConfig, getRecommendedRules, getAllRules, getPackageMeta } from '../src/index.mjs';

// 1. Verify js.configs.recommended structure and properties
const recommended = getRecommendedConfig();
assert.ok(recommended, 'configs.recommended should exist');
assert.strictEqual(typeof recommended, 'object', 'configs.recommended should be an object');
assert.ok(recommended.rules, 'configs.recommended should contain rules property');
assert.strictEqual(typeof recommended.rules, 'object', 'configs.recommended.rules should be an object');

const recRules = getRecommendedRules();
assert.strictEqual(recRules, recommended.rules, 'getRecommendedRules returns recommended.rules');
assert.ok(Object.keys(recRules).length > 0, 'recommended rules should not be empty');
assert.strictEqual(recRules['constructor-super'], 'error', 'constructor-super should be configured');
assert.strictEqual(recRules['no-undef'], 'error', 'no-undef should be configured');
assert.strictEqual(recRules['no-unused-vars'], 'error', 'no-unused-vars should be configured');

// 2. Verify js.configs.all structure and properties
const all = getAllConfig();
assert.ok(all, 'configs.all should exist');
assert.strictEqual(typeof all, 'object', 'configs.all should be an object');
assert.ok(all.rules, 'configs.all should contain rules property');
assert.strictEqual(typeof all.rules, 'object', 'configs.all.rules should be an object');

const allRules = getAllRules();
assert.strictEqual(allRules, all.rules, 'getAllRules returns all.rules');
assert.ok(Object.keys(allRules).length > Object.keys(recRules).length, 'all rules should have more rules than recommended');
assert.strictEqual(allRules['accessor-pairs'], 'error', 'accessor-pairs should be configured in all rules');
assert.strictEqual(allRules['no-undef'], 'error', 'no-undef should be configured in all rules');

// 3. Verify exact export shape of @eslint/js
assert.strictEqual(js.configs.recommended, recommended, 'js.configs.recommended matches exported config');
assert.strictEqual(js.configs.all, all, 'js.configs.all matches exported config');
const meta = getPackageMeta();
assert.strictEqual(typeof meta, 'object', 'meta should be an object');
assert.strictEqual(meta.name, '@eslint/js', 'meta.name should be @eslint/js');
assert.strictEqual(meta.version, '9.20.0', 'meta.version should be 9.20.0');

console.log('Contract assertions passed successfully.');