CodeSampleX

Sample

@babel/core 7.29.7: parseSync

Verified sample for npm @babel/core 7.29.7: parseSync. The contract ran on node 22 · linux alpine/x64 · docker and passed: babel exports parseSync function

sha256:dfaeb4f8e2105131fa1f1d99c80499e1b4fb0ab089117f90760e61727b2d7a12

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 linux 24 · ubuntu · glibc 2.39 x64 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@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-23

Case

HOW
Goal
verify @babel/core.parseSync in pkg:npm/%40babel/core@7.29.7
Packages
Symbols
  • @babel/core.parseSync
Created
2026-08-23T06:17:20Z

Contract

  1. babel exports parseSync function
  2. parseSync parses JavaScript source code into a File AST node with Program body and default sourceType module
  3. parseSync accepts parserOpts plugins such as jsx to parse extended syntax without transformation plugins
  4. parseSync populates tokens array when parserOpts.tokens is true
  5. parseSync with sourceType unambiguous parses export statements as module and plain statements as script
  6. parseSync returns null when filename matches ignore pattern in options
  7. parseSync throws a SyntaxError with BABEL_PARSE_ERROR code on invalid syntax

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 @babel/core.parseSync in pkg:npm/%40babel/core@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.29.7
Demonstrate these symbols/APIs:
  - @babel/core.parseSync

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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package-lock.json
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package.json
{
  "name": "sample-babel-parsesync",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.29.7"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @babel/core.parseSync in pkg:npm/%40babel/core@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.7"
  ],
  "symbols": [
    "@babel/core.parseSync"
  ]
}
test/contract.mjs
import assert from 'node:assert/strict';
import * as babel from '@babel/core';

// 1. parseSync is exported as a function
assert.equal(typeof babel.parseSync, 'function', 'babel.parseSync must be a function');

// 2. parseSync parses JavaScript source code into a File AST node with default sourceType module
{
  const code = 'export function add(a, b) { return a + b; }';
  const ast = babel.parseSync(code, {
    configFile: false,
    babelrc: false
  });

  assert.ok(ast, 'parseSync should return an AST node');
  assert.equal(ast.type, 'File', 'root AST node must be of type File');
  assert.equal(ast.program.type, 'Program', 'AST must have a Program node');
  assert.equal(ast.program.sourceType, 'module', 'default program sourceType should be module');
  assert.equal(ast.program.body.length, 1, 'program body should contain 1 statement');
  assert.equal(ast.program.body[0].type, 'ExportNamedDeclaration', 'first statement should be ExportNamedDeclaration');
  assert.equal(ast.program.body[0].declaration.id.name, 'add', 'function identifier should be add');
}

// 3. parseSync parses extended syntax such as JSX when parserOpts plugins are specified
{
  const jsxCode = 'const element = <div className="card">Hello World</div>;';
  const ast = babel.parseSync(jsxCode, {
    configFile: false,
    babelrc: false,
    parserOpts: {
      plugins: ['jsx']
    }
  });

  assert.ok(ast, 'parseSync should return AST for JSX code');
  const statement = ast.program.body[0];
  assert.equal(statement.type, 'VariableDeclaration', 'statement should be VariableDeclaration');
  const declarator = statement.declarations[0];
  assert.equal(declarator.init.type, 'JSXElement', 'expression init should be JSXElement');
  assert.equal(declarator.init.openingElement.name.name, 'div', 'JSX opening element name should be div');
}

// 4. parseSync populates tokens array with token metadata when parserOpts tokens is true
{
  const code = 'const answer = 42;';
  const ast = babel.parseSync(code, {
    configFile: false,
    babelrc: false,
    parserOpts: {
      tokens: true
    }
  });

  assert.ok(ast, 'parseSync should return AST');
  assert.ok(Array.isArray(ast.tokens), 'ast.tokens should be an array when parserOpts.tokens is true');
  assert.ok(ast.tokens.length >= 4, 'tokens array should contain tokens for declaration and eof');
  assert.ok(ast.tokens.some(t => t.value === 'answer'), 'tokens should include identifier answer');
  assert.ok(ast.tokens.some(t => t.value === 42 || t.value === '42'), 'tokens should include numeric literal 42');
  const lastToken = ast.tokens[ast.tokens.length - 1];
  assert.equal(lastToken.type.label, 'eof', 'last token should be eof');
}

// 5. parseSync with sourceType unambiguous detects module vs script
{
  const moduleCode = 'export const x = 10;';
  const moduleAst = babel.parseSync(moduleCode, {
    configFile: false,
    babelrc: false,
    sourceType: 'unambiguous'
  });
  assert.equal(moduleAst.program.sourceType, 'module', 'unambiguous sourceType with export should detect module');

  const scriptCode = 'const y = 20;';
  const scriptAst = babel.parseSync(scriptCode, {
    configFile: false,
    babelrc: false,
    sourceType: 'unambiguous'
  });
  assert.equal(scriptAst.program.sourceType, 'script', 'unambiguous sourceType without import/export should detect script');
}

// 6. parseSync returns null when filename matches ignore pattern in options
{
  const result = babel.parseSync('const x = 1;', {
    configFile: false,
    babelrc: false,
    filename: 'node_modules/example/index.js',
    ignore: ['node_modules/**']
  });

  assert.strictEqual(result, null, 'parseSync should return null when filename matches ignore pattern');
}

// 7. parseSync throws a SyntaxError with BABEL_PARSE_ERROR code on invalid syntax
{
  assert.throws(
    () => {
      babel.parseSync('const invalid syntax = ;', {
        configFile: false,
        babelrc: false
      });
    },
    (err) => {
      return err instanceof SyntaxError && err.code === 'BABEL_PARSE_ERROR' && typeof err.loc === 'object';
    },
    'Invalid syntax must throw SyntaxError with BABEL_PARSE_ERROR code and location metadata'
  );
}

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

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