@eslint/config-helpers 0.4.2: defineConfig, globalIgnores

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/%40eslint/config-helpers@0.4.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40eslint/config-helpers@0.4.2
Demonstrate these symbols/APIs:
  - defineConfig
  - globalIgnores

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:sha256:3005703d5f57d9bdcfa7179489674da9e34f6f3b65c4285a3774a43c7321529a","contract":["globalIgnores creates global ignore config with default name or custom name","defineConfig flattens nested config arrays and preserves individual configuration objects","defineConfig extends configuration objects by merging files combinations and ignores patterns","defineConfig resolves and normalizes plugin configs by renaming rule namespaces","defineConfig and globalIgnores validate arguments and throw TypeError for invalid inputs"],"goal":"verify pkg:npm/%40eslint/config-helpers@0.4.2","kind":"HOW","packages":["pkg:npm/%40eslint/config-helpers@0.4.2"],"schemaVersion":1,"symbols":["defineConfig","globalIgnores"]},"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/config-helpers@0.4.2"],"schemaVersion":1,"subject":"pkg:npm/%40eslint/config-helpers@0.4.2","symbols":["defineConfig","globalIgnores"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-eslint-config-helpers",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-eslint-config-helpers",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@eslint/config-helpers": "0.4.2"
      }
    },
    "node_modules/@eslint/config-helpers": {
      "version": "0.4.2",
      "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.4.2.tgz",
      "integrity": "sha512-gBrxN88gOIf3R7ja5K9slwNayVcZgK6SOUORm2uBzTeIEfeVaIhOpCtTox3P6R7o2jLFwLFTLnC7kU/RGcYEgw==",
      "license": "Apache-2.0",
      "dependencies": {
        "@eslint/core": "^0.17.0"
      },
      "engines": {
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      }
    },
    "node_modules/@eslint/core": {
      "version": "0.17.0",
      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-0.17.0.tgz",
      "integrity": "sha512-yL/sLrpmtDaFEiUj1osRP4TI2MDz1AddJL+jZ7KSqvBuliN4xqYY54IfdN8qD8Toa6g1iloph1fxQNkjOxrrpQ==",
      "license": "Apache-2.0",
      "dependencies": {
        "@types/json-schema": "^7.0.15"
      },
      "engines": {
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      }
    },
    "node_modules/@types/json-schema": {
      "version": "7.0.15",
      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.15.tgz",
      "integrity": "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-eslint-config-helpers",
  "version": "1.0.0",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "@eslint/config-helpers": "0.4.2"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40eslint/config-helpers@0.4.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40eslint/config-helpers@0.4.2"
  ],
  "symbols": [
    "defineConfig",
    "globalIgnores"
  ]
}

import assert from "node:assert/strict";
import { defineConfig, globalIgnores } from "@eslint/config-helpers";

// 1. globalIgnores creates global ignore config with default name or custom name
const defaultIgnores = globalIgnores(["dist/**", "build/**"]);
assert.deepEqual(defaultIgnores.ignores, ["dist/**", "build/**"]);
assert.match(defaultIgnores.name, /^globalIgnores \d+$/);

const customIgnores = globalIgnores(["coverage/**"], "ignore-coverage");
assert.deepEqual(customIgnores.ignores, ["coverage/**"]);
assert.equal(customIgnores.name, "ignore-coverage");

// 2. defineConfig flattens nested config arrays and preserves individual configuration objects
const baseConfig = { name: "base", rules: { "no-unused-vars": "error" } };
const overrideConfig = {
  name: "override",
  files: ["src/**/*.js"],
  rules: { semi: "warn" },
};
const flattened = defineConfig([baseConfig, [overrideConfig]]);
assert.equal(flattened.length, 2);
assert.equal(flattened[0].name, "base");
assert.equal(flattened[0].rules["no-unused-vars"], "error");
assert.equal(flattened[1].name, "override");
assert.deepEqual(flattened[1].files, ["src/**/*.js"]);
assert.equal(flattened[1].rules.semi, "warn");

// 3. defineConfig extends configuration objects by merging files combinations and ignores patterns
const extendedConfig = {
  name: "plugin-rules",
  files: ["**/*.spec.js"],
  ignores: ["fixtures/**"],
  rules: { "custom/rule": "error" },
};
const withExtends = defineConfig({
  name: "my-config",
  files: ["src/**/*.js"],
  ignores: ["dist/**"],
  extends: [extendedConfig],
  rules: { "prefer-const": "error" },
});
assert.equal(withExtends.length, 2);
assert.equal(withExtends[0].name, "my-config > plugin-rules");
assert.deepEqual(withExtends[0].files, [["src/**/*.js", "**/*.spec.js"]]);
assert.deepEqual(withExtends[0].ignores, ["dist/**", "fixtures/**"]);
assert.equal(withExtends[0].rules["custom/rule"], "error");
assert.equal(withExtends[1].name, "my-config");
assert.equal(withExtends[1].rules["prefer-const"], "error");

// 4. defineConfig resolves and normalizes plugin configs by renaming rule namespaces
const mockPlugin = {
  meta: { name: "eslint-plugin-sample", namespace: "sample" },
  configs: {
    recommended: {
      rules: { "sample/no-bad-logic": "error" },
    },
  },
};
const pluginConfigResult = defineConfig({
  name: "consumer-config",
  plugins: { customPlugin: mockPlugin },
  extends: ["customPlugin/recommended"],
});
assert.equal(pluginConfigResult.length, 2);
assert.equal(
  pluginConfigResult[0].name,
  "consumer-config > customPlugin/recommended"
);
assert.equal(pluginConfigResult[0].rules["customPlugin/no-bad-logic"], "error");

// 5. defineConfig and globalIgnores validate arguments and throw TypeError for invalid inputs
assert.throws(() => defineConfig(), { name: "TypeError" });
assert.throws(() => defineConfig(null), { name: "TypeError" });
assert.throws(() => globalIgnores("not-an-array"), { name: "TypeError" });
assert.throws(() => globalIgnores([]), { name: "TypeError" });