@babel/core 7.26.9: transformFileSync

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 transformFileSync in pkg:npm/%40babel/core@7.26.9
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.26.9
Demonstrate these symbols/APIs:
  - transformFileSync
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.

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        "json5": "lib/cli.js"
      },
      "engines": {
        "node": ">=6"
      }
    },
    "node_modules/lru-cache": {
      "version": "5.1.1",
      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-5.1.1.tgz",
      "integrity": "sha512-KpNARQA3Iwv+jTA0utUVVbrh+Jlrr1Fv0e56GGzAFOXN7dk/FviaDW8LHmK52DlcH4WP2n6gI8vN1aesBFgo9w==",
      "license": "ISC",
      "dependencies": {
        "yallist": "^3.0.2"
      }
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      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
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      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.54.tgz",
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      "license": "MIT",
      "engines": {
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      "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",
      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
      "license": "ISC",
      "bin": {
        "semver": "bin/semver.js"
      }
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      "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.3.2.tgz",
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      "funding": [
        {
          "type": "opencollective",
          "url": "https://opencollective.com/browserslist"
        },
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          "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"
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        "update-browserslist-db": "cli.js"
      },
      "peerDependencies": {
        "browserslist": ">= 4.21.0"
      }
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      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
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}

{
  "name": "sample-babel-core",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.26.9"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify transformFileSync in pkg:npm/%40babel/core@7.26.9",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.26.9"
  ],
  "symbols": [
    "transformFileSync"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import assert from 'node:assert/strict';
import fs from 'node:fs';
import path from 'node:path';
import os from 'node:os';
import * as babel from '@babel/core';

// 1. Export verification
assert.equal(typeof babel.transformFileSync, 'function', 'babel.transformFileSync must be a function');

const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'babel-test-'));
const validFile = path.join(tempDir, 'fixture.js');
const invalidFile = path.join(tempDir, 'invalid.js');

try {
  fs.writeFileSync(validFile, 'const OLD_NAME = 42;\nexport default OLD_NAME;\n');
  fs.writeFileSync(invalidFile, 'const 123broken = ;\n');

  // 2. Synchronous file transformation returning code
  const syncResult = babel.transformFileSync(validFile, {
    configFile: false,
    babelrc: false
  });
  assert.ok(syncResult, 'transformFileSync must return result object');
  assert.equal(typeof syncResult.code, 'string', 'transformFileSync result must contain code string');
  assert.ok(syncResult.code.includes('const OLD_NAME = 42;'), 'transformFileSync should contain source code semantics');

  // 3. Custom AST visitor plugins
  const customPlugin = {
    visitor: {
      Identifier(path) {
        if (path.node.name === 'OLD_NAME') {
          path.node.name = 'NEW_NAME';
        }
      }
    }
  };
  const pluginResult = babel.transformFileSync(validFile, {
    plugins: [() => customPlugin],
    configFile: false,
    babelrc: false
  });
  assert.ok(pluginResult, 'plugin transformation must return result');
  assert.ok(pluginResult.code.includes('NEW_NAME'), 'transformed code should contain renamed identifier');
  assert.ok(!pluginResult.code.includes('OLD_NAME'), 'transformed code should not contain old identifier');

  // 4. Source map generation
  const mapResult = babel.transformFileSync(validFile, {
    configFile: false,
    babelrc: false,
    sourceMaps: true
  });
  assert.ok(mapResult.map, 'transformFileSync should generate sourcemap when sourceMaps: true');
  assert.ok(mapResult.map.sources.length > 0, 'sourcemap sources should not be empty');
  assert.ok(mapResult.map.sources.some(s => s.includes('fixture.js')), 'sourcemap sources should reference input file');

  // 5. AST generation
  const astResult = babel.transformFileSync(validFile, {
    configFile: false,
    babelrc: false,
    ast: true
  });
  assert.ok(astResult.ast, 'transformFileSync should return AST when ast: true');
  assert.equal(astResult.ast.type, 'File', 'root node of returned AST must be File');
  assert.equal(astResult.ast.program.type, 'Program', 'AST must have a Program node');

  // 6. Minification
  const minResult = babel.transformFileSync(validFile, {
    configFile: false,
    babelrc: false,
    minified: true
  });
  assert.ok(minResult.code.length < syncResult.code.length, 'minified code should be shorter than unminified code');

  // 7. ENOENT on missing file
  let enoentErr = null;
  try {
    babel.transformFileSync(path.join(tempDir, 'nonexistent.js'), {
      configFile: false,
      babelrc: false
    });
  } catch (err) {
    enoentErr = err;
  }
  assert.ok(enoentErr, 'transformFileSync must throw when target file does not exist');
  assert.equal(enoentErr.code, 'ENOENT', 'error code must be ENOENT');

  // 8. BABEL_PARSE_ERROR on syntax error
  let parseErr = null;
  try {
    babel.transformFileSync(invalidFile, {
      configFile: false,
      babelrc: false
    });
  } catch (err) {
    parseErr = err;
  }
  assert.ok(parseErr, 'transformFileSync must throw when file has invalid syntax');
  assert.equal(parseErr.code, 'BABEL_PARSE_ERROR', 'error code must be BABEL_PARSE_ERROR');

  console.log('Contract tests passed successfully.');
} finally {
  fs.rmSync(tempDir, { recursive: true, force: true });
}