CodeSampleX

Sample

@babel/core 7.22.5: loadPartialConfigSync

Verified sample for npm @babel/core 7.22.5: loadPartialConfigSync. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:3e57d145a56ce96df87d9c01295dc809e0533a24a03c7df2648a6d2b6590a1e8

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 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-06

Case

HOW
Goal
verify @babel/core.loadPartialConfigSync in pkg:npm/%40babel/core@7.22.5
Packages
Symbols
  • @babel/core.loadPartialConfigSync
Environment
node 22.23.2
Created
2026-09-06T16:05:26Z

Contract

  1. loadPartialConfigSync is an exported function on @babel/core and wrapper module
  2. loadPartialConfigSync returns PartialConfig object with hasFilesystemConfig function, options, and files set
  3. loadPartialConfigSync defaults options.babelrc and options.configFile to false and hasFilesystemConfig to false when filename is omitted
  4. loadPartialConfigSync preserves user options including minified sourceMaps and comments
  5. loadPartialConfigSync returns null when filename matches ignore pattern
  6. loadPartialConfigSync returns null when filename does not match only pattern
  7. loadPartialConfigSync discovers filesystem config file and sets hasFilesystemConfig to true when configFile path is provided
  8. loadPartialConfigSync throws Error when passed invalid configuration option

Files

  • PROMPT.md
  • csx.json
  • fixtures/babel.config.json
  • index.js
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.mjs

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 @babel/core.loadPartialConfigSync in pkg:npm/%40babel/core@7.22.5
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.22.5
Demonstrate these symbols/APIs:
  - @babel/core.loadPartialConfigSync
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - 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
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fixtures/babel.config.json
{
  "minified": true
}
index.js
const babel = require('@babel/core');

/**
 * Loads partial Babel configuration synchronously.
 *
 * @param {object} [options={}] - Babel configuration options.
 * @returns {object|null} - Resolved partial configuration or null if ignored.
 */
function loadConfig(options = {}) {
  return babel.loadPartialConfigSync(options);
}

module.exports = {
  loadConfig,
  loadPartialConfigSync: babel.loadPartialConfigSync
};
package-lock.json
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package.json
{
  "name": "sample-babel-core-load-partial-config",
  "version": "1.0.0",
  "description": "Clean-room sample verifying @babel/core.loadPartialConfigSync in @babel/core",
  "main": "index.js",
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.22.5"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @babel/core.loadPartialConfigSync in pkg:npm/%40babel/core@7.22.5",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.22.5"
  ],
  "symbols": [
    "@babel/core.loadPartialConfigSync"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import { fileURLToPath } from 'node:url';
import path from 'node:path';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const babel = require('@babel/core');
const { loadConfig, loadPartialConfigSync } = require('../index.js');

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const fixtureConfigPath = path.resolve(__dirname, '../fixtures/babel.config.json');

// Contract 1: loadPartialConfigSync is an exported function on @babel/core
assert.equal(typeof babel.loadPartialConfigSync, 'function', 'babel.loadPartialConfigSync must be a function');
assert.equal(typeof loadPartialConfigSync, 'function', 'loadPartialConfigSync must be a function');
assert.equal(typeof loadConfig, 'function', 'loadConfig wrapper must be a function');

// Contract 2: loadPartialConfigSync returns PartialConfig object with hasFilesystemConfig function and options
{
  const conf = babel.loadPartialConfigSync({});
  assert.equal(typeof conf, 'object', 'loadPartialConfigSync must return an object');
  assert.ok(conf !== null, 'loadPartialConfigSync result must not be null');
  assert.equal(typeof conf.hasFilesystemConfig, 'function', 'conf.hasFilesystemConfig must be a function');
  assert.equal(typeof conf.options, 'object', 'conf.options must be an object');
  assert.equal(conf.fileHandling, 'transpile', 'conf.fileHandling must be transpile');
  assert.ok(conf.files instanceof Set, 'conf.files must be a Set');
}

// Contract 3: loadPartialConfigSync defaults options.babelrc and options.configFile to false and hasFilesystemConfig to false when filename is omitted
{
  const conf = loadConfig({});
  assert.equal(conf.hasFilesystemConfig(), false, 'hasFilesystemConfig must return false when filename is omitted');
  assert.equal(conf.babelrc, undefined, 'babelrc must be undefined when filename is omitted');
  assert.equal(conf.config, undefined, 'config must be undefined when filename is omitted');
  assert.equal(conf.options.babelrc, false, 'options.babelrc must default to false');
  assert.equal(conf.options.configFile, false, 'options.configFile must default to false');
}

// Contract 4: loadPartialConfigSync preserves user options including minified sourceMaps and comments
{
  const conf = loadConfig({
    configFile: false,
    babelrc: false,
    minified: true,
    sourceMaps: true,
    comments: false
  });
  assert.equal(conf.options.minified, true, 'options.minified must be preserved');
  assert.equal(conf.options.sourceMaps, true, 'options.sourceMaps must be preserved');
  assert.equal(conf.options.comments, false, 'options.comments must be preserved');
  assert.equal(conf.options.configFile, false, 'options.configFile must remain false');
  assert.equal(conf.options.babelrc, false, 'options.babelrc must remain false');
}

// Contract 5: loadPartialConfigSync returns null when filename matches ignore pattern
{
  const ignoredFile = path.resolve(__dirname, '../fixtures/ignored.js');
  const conf = babel.loadPartialConfigSync({
    filename: ignoredFile,
    ignore: [ignoredFile]
  });
  assert.equal(conf, null, 'loadPartialConfigSync must return null for ignored file');
}

// Contract 6: loadPartialConfigSync returns null when filename does not match only pattern
{
  const targetFile = path.resolve(__dirname, '../fixtures/target.js');
  const otherFile = path.resolve(__dirname, '../fixtures/other.js');
  const conf = babel.loadPartialConfigSync({
    filename: targetFile,
    only: [otherFile]
  });
  assert.equal(conf, null, 'loadPartialConfigSync must return null when only condition is not satisfied');
}

// Contract 7: loadPartialConfigSync discovers filesystem config file and sets hasFilesystemConfig to true when configFile path is provided
{
  const conf = babel.loadPartialConfigSync({
    configFile: fixtureConfigPath
  });
  assert.ok(conf !== null, 'config must not be null');
  assert.equal(conf.hasFilesystemConfig(), true, 'hasFilesystemConfig must return true when configFile exists');
  assert.equal(conf.config, fixtureConfigPath, 'conf.config must match provided configFile');
  assert.equal(conf.options.minified, true, 'conf.options.minified must reflect settings from configFile');
  assert.ok(conf.files.has(fixtureConfigPath), 'conf.files Set must contain fixtureConfigPath');
}

// Contract 8: loadPartialConfigSync throws Error when passed invalid configuration option
{
  let threw = false;
  try {
    babel.loadPartialConfigSync({
      invalidBabelOptionNameXYZ: 123
    });
  } catch (err) {
    threw = true;
    assert.ok(err instanceof Error, 'thrown error must be an Error instance');
    assert.match(err.message, /invalidBabelOptionNameXYZ/, 'error message must cite invalid option');
  }
  assert.equal(threw, true, 'loadPartialConfigSync must throw when invalid option is provided');
}

console.log('All @babel/core.loadPartialConfigSync contract assertions passed successfully.');

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