CodeSampleX

Sample

@babel/core 7.26.0

Verified sample for npm @babel/core 7.26.0. The contract ran on node 22 · linux debian/x64 · docker and passed: babel exports core functions and objects…

sha256:e9034d51fdfb7708486fbef510205ab56fa8fe1d75fbbef73870ad1b0b95f971

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…		 2026-09-03

Case

HOW
Goal
verify pkg:npm/%40babel/core@7.26.0
Packages
Environment
node 22.23.2
Created
2026-09-03T09:39:22Z

Contract

  1. babel exports core functions and objects transformSync transformAsync transformFromAstSync transformFromAstAsync parseSync parseAsync traverse types template
  2. transformSync transforms source code using custom AST visitor plugin returning transformed code and AST
  3. transformAsync transforms source code asynchronously returning a promise resolving to transformation result
  4. parseSync and parseAsync parse JavaScript source code into a Babel AST structure
  5. traverse traverses AST nodes and supports in-place node modifications
  6. types provides helper functions to check node types and build AST nodes
  7. template creates AST nodes from template strings with identifier and expression replacements
  8. transformFromAstSync and transformFromAstAsync generate code from a Babel AST representation
  9. loadOptions and loadPartialConfig inspect and load Babel configuration

Files

  • PROMPT.md
  • csx.json
  • 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 pkg:npm/%40babel/core@7.26.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.26.0

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:sha256:4bdd79938585c0fbdb648ebc0f17e5a094e3965e3a0b4380d8eaf23955776e71","contract":["babel exports core functions and objects transformSync transformAsync transformFromAstSync transformFromAstAsync parseSync parseAsync traverse types template","transformSync transforms source code using custom AST visitor plugin returning transformed code and AST","transformAsync transforms source code asynchronously returning a promise resolving to transformation result","parseSync and parseAsync parse JavaScript source code into a Babel AST structure","traverse traverses AST nodes and supports in-place node modifications","types provides helper functions to check node types and build AST nodes","template creates AST nodes from template strings with identifier and expression replacements","transformFromAstSync and transformFromAstAsync generate code from a Babel AST representation","loadOptions and loadPartialConfig inspect and load Babel configuration"],"goal":"verify pkg:npm/%40babel/core@7.26.0","kind":"HOW","packages":["pkg:npm/%40babel/core@7.26.0"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/core@7.26.0"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.26.0","verifierAdapter":"node-typescript@1"}
package-lock.json
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      "license": "MIT",
      "engines": {
        "node": ">=6.9.0"
      }
    },
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      "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
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        "jsesc": "bin/jsesc"
      },
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      "license": "MIT",
      "bin": {
        "json5": "lib/cli.js"
      },
      "engines": {
        "node": ">=6"
      }
    },
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      "license": "MIT",
      "engines": {
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      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
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      "bin": {
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      "funding": [
        {
          "type": "opencollective",
          "url": "https://opencollective.com/browserslist"
        },
        {
          "type": "tidelift",
          "url": "https://tidelift.com/funding/github/npm/browserslist"
        },
        {
          "type": "github",
          "url": "https://github.com/sponsors/ai"
        }
      ],
      "license": "MIT",
      "dependencies": {
        "escalade": "^3.2.0",
        "picocolors": "^1.1.1"
      },
      "bin": {
        "update-browserslist-db": "cli.js"
      },
      "peerDependencies": {
        "browserslist": ">= 4.21.0"
      }
    },
    "node_modules/yallist": {
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      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
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      "license": "ISC"
    }
  }
}
package.json
{
  "name": "sample-babel-core",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.26.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/core@7.26.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.0"
  ]
}
test/contract.mjs
import assert from 'node:assert/strict';
import * as babel from '@babel/core';

// 1. Export verification
assert.equal(typeof babel.transformSync, 'function', 'babel.transformSync must be a function');
assert.equal(typeof babel.transformAsync, 'function', 'babel.transformAsync must be a function');
assert.equal(typeof babel.transformFromAstSync, 'function', 'babel.transformFromAstSync must be a function');
assert.equal(typeof babel.transformFromAstAsync, 'function', 'babel.transformFromAstAsync must be a function');
assert.equal(typeof babel.parseSync, 'function', 'babel.parseSync must be a function');
assert.equal(typeof babel.parseAsync, 'function', 'babel.parseAsync must be a function');
assert.equal(typeof babel.traverse, 'function', 'babel.traverse must be a function');
assert.equal(typeof babel.types, 'object', 'babel.types must be an object');
assert.equal(typeof babel.template, 'function', 'babel.template must be a function');
assert.equal(typeof babel.createConfigItem, 'function', 'babel.createConfigItem must be a function');
assert.equal(typeof babel.loadOptions, 'function', 'babel.loadOptions must be a function');
assert.equal(typeof babel.loadPartialConfig, 'function', 'babel.loadPartialConfig must be a function');

// 2. transformSync transforms source code using custom AST visitor plugin and returns transformed code and AST
const customPlugin = {
  visitor: {
    Identifier(path) {
      if (path.node.name === 'OLD_NAME') {
        path.node.name = 'NEW_NAME';
      }
    }
  }
};

const syncResult = babel.transformSync('const OLD_NAME = 42;', {
  plugins: [() => customPlugin],
  configFile: false,
  babelrc: false,
  ast: true,
  sourceMaps: true
});

assert.ok(syncResult, 'transformSync should return a result object');
assert.equal(typeof syncResult.code, 'string', 'transformSync result should contain code string');
assert.ok(syncResult.code.includes('NEW_NAME'), 'transformSync should apply identifier rename');
assert.ok(!syncResult.code.includes('OLD_NAME'), 'transformSync should replace OLD_NAME');
assert.ok(syncResult.ast, 'transformSync should return AST when ast: true');
assert.equal(syncResult.ast.type, 'File', 'returned AST root must be File');
assert.ok(syncResult.map, 'transformSync should return sourcemap when sourceMaps: true');

// 3. transformAsync transforms source code asynchronously returning a promise resolving to transformation result
const asyncResult = await babel.transformAsync('const x = 1 + 2;', {
  configFile: false,
  babelrc: false,
  comments: false
});

assert.ok(asyncResult, 'transformAsync should resolve to a result object');
assert.equal(typeof asyncResult.code, 'string', 'transformAsync result should contain code string');
assert.ok(asyncResult.code.includes('const x = 1 + 2;'), 'transformAsync should preserve code semantics');

// 4. parseSync and parseAsync parse JavaScript source code into a Babel AST structure
const ast = babel.parseSync('function add(a, b) { return a + b; }', {
  configFile: false,
  babelrc: false
});

assert.ok(ast, 'parseSync should return an AST');
assert.equal(ast.type, 'File', 'root node should be of type File');
assert.equal(ast.program.type, 'Program', 'ast should have a Program node');
assert.equal(ast.program.body.length, 1, 'ast program should contain one statement');
assert.equal(ast.program.body[0].type, 'FunctionDeclaration', 'first statement should be FunctionDeclaration');
assert.equal(ast.program.body[0].id.name, 'add', 'function name should be add');

const asyncAst = await babel.parseAsync('const answer = 42;', {
  configFile: false,
  babelrc: false
});
assert.ok(asyncAst, 'parseAsync should return an AST');
assert.equal(asyncAst.type, 'File', 'root node should be File');

// 5. traverse traverses AST nodes and supports in-place node modifications
const { types: t } = babel;
let identifierCount = 0;

babel.traverse(ast, {
  Identifier(path) {
    identifierCount++;
    if (path.node.name === 'add') {
      path.node.name = 'sum';
    }
  }
});

assert.ok(identifierCount >= 3, 'traverse should visit all identifiers in function declaration');

// 6. types provides helper functions to check node types and build AST nodes
assert.ok(t.isIdentifier(t.identifier('foo')), 't.isIdentifier should validate identifier nodes');
assert.ok(t.isNumericLiteral(t.numericLiteral(123)), 't.isNumericLiteral should validate numeric literal');
assert.ok(t.isBinaryExpression(t.binaryExpression('+', t.identifier('a'), t.identifier('b'))), 't.isBinaryExpression should validate binary expressions');
assert.ok(t.isFunctionDeclaration(ast.program.body[0]), 't.isFunctionDeclaration should validate function declaration node');

// 7. template creates AST nodes from template strings with identifier and expression replacements
const buildRequire = babel.template('const IMPORT_NAME = require(SOURCE);');
const requireAst = buildRequire({
  IMPORT_NAME: t.identifier('myModule'),
  SOURCE: t.stringLiteral('my-pkg')
});

assert.equal(requireAst.type, 'VariableDeclaration', 'template should generate VariableDeclaration AST');
assert.equal(requireAst.declarations[0].id.name, 'myModule', 'template should replace identifier');
assert.equal(requireAst.declarations[0].init.arguments[0].value, 'my-pkg', 'template should replace source literal');

// 8. transformFromAstSync and transformFromAstAsync generate code from a Babel AST representation
const fromAstResult = babel.transformFromAstSync(ast, undefined, {
  configFile: false,
  babelrc: false,
  sourceMaps: true
});

assert.ok(fromAstResult, 'transformFromAstSync should return a result');
assert.ok(fromAstResult.code.includes('function sum(a, b)'), 'transformed code from mutated AST should contain renamed function');
assert.ok(fromAstResult.map, 'source map should be generated when sourceMaps is true');

const fromAstAsyncResult = await babel.transformFromAstAsync(ast, undefined, {
  configFile: false,
  babelrc: false
});
assert.ok(fromAstAsyncResult, 'transformFromAstAsync should return a result');
assert.ok(fromAstAsyncResult.code.includes('function sum(a, b)'), 'async transformed code should contain renamed function');

// 9. Configuration loading APIs
const loadedOpts = babel.loadOptions({
  configFile: false,
  babelrc: false,
  minified: true
});
assert.equal(typeof loadedOpts, 'object', 'loadOptions should return config object');
assert.equal(loadedOpts.minified, true, 'loadOptions should preserve options');

const partialConfig = babel.loadPartialConfig({
  configFile: false,
  babelrc: false
});
assert.ok(partialConfig, 'loadPartialConfig should return partial config object');
assert.equal(partialConfig.hasFilesystemConfig(), false, 'loadPartialConfig hasFilesystemConfig should be false when configFile/babelrc disabled');

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

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