@babel/core 7.26.10: default

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.default in pkg:npm/%40babel/core@7.26.10
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.26.10
Demonstrate these symbols/APIs:
  - @babel/core.default

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.

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      "license": "MIT",
      "engines": {
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      }
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    "node_modules/picocolors": {
      "version": "1.1.1",
      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
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      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
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          "url": "https://opencollective.com/browserslist"
        },
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          "url": "https://tidelift.com/funding/github/npm/browserslist"
        },
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          "url": "https://github.com/sponsors/ai"
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        "picocolors": "^1.1.1"
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}

{
  "name": "sample-babel-core-default",
  "version": "1.0.0",
  "description": "verify @babel/core.default in pkg:npm/%40babel/core@7.26.10",
  "type": "module",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/core": "7.26.10"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/core.default in pkg:npm/%40babel/core@7.26.10",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.10"
  ],
  "symbols": [
    "@babel/core.default"
  ]
}

import babelDefault from '@babel/core';
import * as babelNamespace from '@babel/core';

/**
 * Returns the default export of @babel/core.
 *
 * @returns {object} The @babel/core default export object.
 */
export function getDefaultExport() {
  return babelDefault;
}

/**
 * Verifies that the namespace default property matches the default import.
 *
 * @returns {boolean} True if the default export equals namespace.default.
 */
export function verifyDefaultExportIdentity() {
  return babelNamespace.default === babelDefault;
}

/**
 * Synchronously transforms JavaScript code using the default export's transformSync method.
 *
 * @param {string} code - The input source code.
 * @param {object} [options={}] - Babel transformation options.
 * @returns {object|null} The transformation result containing code, map, and ast.
 */
export function transformSyncWithDefault(code, options = {}) {
  return babelDefault.transformSync(code, options);
}

/**
 * Asynchronously transforms JavaScript code using the default export's transformAsync method.
 *
 * @param {string} code - The input source code.
 * @param {object} [options={}] - Babel transformation options.
 * @returns {Promise<object|null>} Promise resolving to the transformation result.
 */
export async function transformAsyncWithDefault(code, options = {}) {
  return await babelDefault.transformAsync(code, options);
}

/**
 * Synchronously parses JavaScript code into an AST using the default export's parseSync method.
 *
 * @param {string} code - The input source code.
 * @param {object} [options={}] - Babel parser options.
 * @returns {object|null} The parsed AST File node.
 */
export function parseSyncWithDefault(code, options = {}) {
  return babelDefault.parseSync(code, options);
}

/**
 * Constructs an AST node from a template string using the default export's template factory.
 *
 * @param {string} templateCode - The code template.
 * @param {object} [replacements={}] - Placeholder replacements.
 * @returns {object} The generated AST node.
 */
export function createAstFromTemplateWithDefault(templateCode, replacements = {}) {
  const templateFn = babelDefault.template(templateCode);
  return templateFn(replacements);
}

/**
 * Validates AST nodes using the types namespace on the default export.
 *
 * @param {object} node - The AST node to check.
 * @returns {boolean} True if the node is an Identifier.
 */
export function isIdentifierNodeWithDefault(node) {
  return babelDefault.types.isIdentifier(node);
}

/**
 * Exposes the version string from the default export.
 *
 * @returns {string} The @babel/core version string.
 */
export function getBabelVersionWithDefault() {
  return babelDefault.version;
}

import assert from 'node:assert';
import babelDefault from '@babel/core';
import {
  getDefaultExport,
  verifyDefaultExportIdentity,
  transformSyncWithDefault,
  transformAsyncWithDefault,
  parseSyncWithDefault,
  createAstFromTemplateWithDefault,
  isIdentifierNodeWithDefault,
  getBabelVersionWithDefault
} from '../src/index.js';

// 1. babel default export is identical to the namespace default property and provides the complete core compiler suite
{
  assert.strictEqual(typeof babelDefault, 'object', 'Babel default export must be an object');
  assert.strictEqual(verifyDefaultExportIdentity(), true, 'Default import must strictly equal namespace.default');
  assert.strictEqual(getDefaultExport(), babelDefault, 'getDefaultExport must return the default export');
  assert.strictEqual(typeof babelDefault.transformSync, 'function', 'Default export must include transformSync');
  assert.strictEqual(typeof babelDefault.transformAsync, 'function', 'Default export must include transformAsync');
  assert.strictEqual(typeof babelDefault.parseSync, 'function', 'Default export must include parseSync');
  assert.strictEqual(typeof babelDefault.template, 'function', 'Default export must include template');
  assert.strictEqual(typeof babelDefault.types, 'object', 'Default export must include types');
  assert.strictEqual(getBabelVersionWithDefault(), '7.26.10', 'Babel version must match 7.26.10');
}

// 2. babel default export exposes transformSync to synchronously transform code and return generated output
{
  const sourceCode = 'const square = (n) => n * n;';
  const result = transformSyncWithDefault(sourceCode, {
    configFile: false,
    babelrc: false,
    comments: false
  });
  assert(result !== null && typeof result === 'object', 'Result must be an object');
  assert.strictEqual(typeof result.code, 'string', 'Result code must be a string');
  assert(result.code.includes('square'), 'Result code must contain variable name');
}

// 3. babel default export exposes transformAsync to asynchronously transform code and return a promise resolving to the result object
{
  const sourceCode = 'async function greet() { return "hello"; }';
  const result = await transformAsyncWithDefault(sourceCode, {
    configFile: false,
    babelrc: false
  });
  assert(result !== null && typeof result === 'object', 'Async result must be an object');
  assert.strictEqual(typeof result.code, 'string', 'Async result code must be a string');
  assert(result.code.includes('greet'), 'Async result must contain greet');
}

// 4. babel default export exposes parseSync to parse JavaScript code into an AST File node
{
  const sourceCode = 'const answer = 42;';
  const ast = parseSyncWithDefault(sourceCode, {
    configFile: false,
    babelrc: false
  });
  assert(ast !== null && typeof ast === 'object', 'Parsed AST must be an object');
  assert.strictEqual(ast.type, 'File', 'Top-level AST node must be a File');
  assert.strictEqual(ast.program.type, 'Program', 'AST must have a Program node');
  assert.strictEqual(ast.program.body.length, 1, 'Program must contain one statement');
  assert.strictEqual(ast.program.body[0].type, 'VariableDeclaration', 'Statement must be a VariableDeclaration');
}

// 5. babel default export exposes template to construct AST nodes from code templates with placeholder replacements
{
  const templateCode = 'function FN_NAME(PARAM) { return PARAM + 1; }';
  const astNode = createAstFromTemplateWithDefault(templateCode, {
    FN_NAME: babelDefault.types.identifier('increment'),
    PARAM: babelDefault.types.identifier('val')
  });
  assert(astNode !== null && typeof astNode === 'object', 'AST node must be an object');
  assert.strictEqual(astNode.type, 'FunctionDeclaration', 'Result node must be FunctionDeclaration');
  assert.strictEqual(astNode.id.name, 'increment', 'Function name placeholder must be replaced');
  assert.strictEqual(astNode.params[0].name, 'val', 'Parameter placeholder must be replaced');
}

// 6. babel default export exposes types to inspect and validate AST nodes
{
  const idNode = babelDefault.types.identifier('myVar');
  const numNode = babelDefault.types.numericLiteral(123);
  assert.strictEqual(isIdentifierNodeWithDefault(idNode), true, 'Identifier node must be identified as Identifier');
  assert.strictEqual(isIdentifierNodeWithDefault(numNode), false, 'NumericLiteral node must not be identified as Identifier');
}

// 7. babel default export transformSync throws a SyntaxError with BABEL_PARSE_ERROR when given invalid syntax
{
  assert.throws(
    () => {
      transformSyncWithDefault('const = ;', {
        configFile: false,
        babelrc: false
      });
    },
    (err) => {
      return (
        err instanceof SyntaxError &&
        err.code === 'BABEL_PARSE_ERROR'
      );
    },
    'Invalid code must throw SyntaxError with BABEL_PARSE_ERROR'
  );
}

console.log('All contract assertions passed successfully.');