CodeSampleX

Sample

@eslint/eslintrc 3.3.6: FlatCompat

Verified sample for npm @eslint/eslintrc 3.3.6: FlatCompat. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:ed1144e48b301f7f85ec3808e91b0ff6043e7c2d905ac902a9adb8045d9e9667

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-20

Case

HOW
Goal
verify @eslint/eslintrc.FlatCompat in pkg:npm/%40eslint/eslintrc@3.3.6
Packages
Symbols
  • @eslint/eslintrc.FlatCompat
Environment
node 22.23.2
Created
2026-08-20T23:34:27Z

Contract

  1. assert FlatCompat instantiates with baseDirectory and configuration presets
  2. assert FlatCompat.config translates legacy eslintrc rules and settings into flat config objects
  3. assert FlatCompat.env translates legacy env flags into languageOptions globals
  4. assert FlatCompat.extends translates recommendedConfig via extends('eslint:recommended')

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • test/contract.js

Download the source artifact (tar.gz)

Source

PROMPT.md
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 @eslint/eslintrc.FlatCompat in pkg:npm/%40eslint/eslintrc@3.3.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40eslint/eslintrc@3.3.6
Demonstrate these symbols/APIs:
  - @eslint/eslintrc.FlatCompat
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - runtime: node@22.23.2

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.
csx.json
{"case":{"caseId":"case:sha256:c7afa8a337ba646d5beef113b8ab4fc7da2f0dc5e3e0cb8be686671654ab1802","constraints":{"executionContext":"node"},"contract":["assert FlatCompat instantiates with baseDirectory and configuration presets","assert FlatCompat.config translates legacy eslintrc rules and settings into flat config objects","assert FlatCompat.env translates legacy env flags into languageOptions globals","assert FlatCompat.extends translates recommendedConfig via extends('eslint:recommended')"],"goal":"verify @eslint/eslintrc.FlatCompat in pkg:npm/%40eslint/eslintrc@3.3.6","kind":"HOW","packages":["pkg:npm/%40eslint/eslintrc@3.3.6"],"schemaVersion":1,"symbols":["@eslint/eslintrc.FlatCompat"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40eslint/eslintrc@3.3.6"],"schemaVersion":1,"subject":"pkg:npm/%40eslint/eslintrc@3.3.6","symbols":["@eslint/eslintrc.FlatCompat"],"verifierAdapter":"node-typescript@1"}
package-lock.json
{
  "name": "sample-eslint-flatcompat",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
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}
package.json
{
  "name": "sample-eslint-flatcompat",
  "version": "1.0.0",
  "private": true,
  "dependencies": {
    "@eslint/eslintrc": "3.3.6"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @eslint/eslintrc.FlatCompat in pkg:npm/%40eslint/eslintrc@3.3.6",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40eslint/eslintrc@3.3.6"
  ],
  "symbols": [
    "@eslint/eslintrc.FlatCompat"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "runtime": "node@22.23.2"
  }
}
src/index.js
const { FlatCompat } = require("@eslint/eslintrc");

function createCompat(options = {}) {
  return new FlatCompat({
    baseDirectory: options.baseDirectory || process.cwd(),
    recommendedConfig: options.recommendedConfig,
    allConfig: options.allConfig,
    resolvePluginsRelativeTo: options.resolvePluginsRelativeTo,
  });
}

function translateConfig(compat, config) {
  return compat.config(config);
}

function translateEnv(compat, env) {
  return compat.env(env);
}

function translateExtends(compat, ...configs) {
  return compat.extends(...configs);
}

module.exports = {
  createCompat,
  translateConfig,
  translateEnv,
  translateExtends,
};
test/contract.js
const assert = require("node:assert");
const { FlatCompat } = require("@eslint/eslintrc");
const {
  createCompat,
  translateConfig,
  translateEnv,
  translateExtends,
} = require("../src/index.js");

// 1. Verify FlatCompat instantiation
const compat = createCompat({
  baseDirectory: process.cwd(),
  recommendedConfig: {
    rules: {
      "no-undef": "error",
      "no-unused-vars": "error",
    },
  },
  allConfig: {
    rules: {
      semi: ["error", "always"],
    },
  },
});
assert(compat instanceof FlatCompat, "compat should be an instance of FlatCompat");

// 2. Verify compat.config translates legacy eslintrc rules and settings into flat config objects
const flatConfigs = translateConfig(compat, {
  rules: {
    "no-console": "warn",
    semi: ["error", "never"],
  },
  settings: {
    framework: "node",
  },
});
assert(Array.isArray(flatConfigs), "translateConfig should return an array");
const ruleConfig = flatConfigs.find((c) => c.rules && c.rules["no-console"]);
assert(ruleConfig, "should translate rules object");
assert.strictEqual(ruleConfig.rules["no-console"], "warn");
assert.deepStrictEqual(ruleConfig.rules["semi"], ["error", "never"]);
const settingsConfig = flatConfigs.find((c) => c.settings && c.settings.framework);
assert(settingsConfig, "should translate settings object");
assert.strictEqual(settingsConfig.settings.framework, "node");

// 3. Verify compat.env translates legacy env flags into languageOptions globals
const envConfigs = translateEnv(compat, {
  es2021: true,
  node: true,
});
assert(Array.isArray(envConfigs), "translateEnv should return an array");
const nodeGlobalConfig = envConfigs.find(
  (c) => c.languageOptions && c.languageOptions.globals && c.languageOptions.globals.process !== undefined
);
assert(nodeGlobalConfig, "should translate node environment to process global");
assert.strictEqual(nodeGlobalConfig.languageOptions.globals.process, false);

// 4. Verify compat.extends translates recommendedConfig via extends("eslint:recommended")
const extConfigs = translateExtends(compat, "eslint:recommended");
assert(Array.isArray(extConfigs), "translateExtends should return an array");
const recRuleConfig = extConfigs.find((c) => c.rules && c.rules["no-undef"]);
assert(recRuleConfig, "should translate eslint:recommended rules");
assert.strictEqual(recRuleConfig.rules["no-undef"], "error");

console.log("PASS: @eslint/eslintrc FlatCompat contract assertions verified");

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