CodeSampleX

Sample

@babel/core 7.26.0: transformFileSync

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

sha256:0728455888cf85c63ede4803554b0ff7bf71d0fff08bee97ada89e7db03c83c7

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
Symbols
  • transformFileSync
Environment
node 22.23.2
Created
2026-09-03T10:13:55Z

Contract

  1. babel exports file transformation functions transformFileSync transformFileAsync and transformFile
  2. transformFileSync synchronously transforms JavaScript source file and returns code string
  3. transformFileSync applies custom AST visitor plugins synchronously to modify AST identifiers in target file
  4. transformFileSync generates source maps referencing input file when sourceMaps option is enabled
  5. transformFileSync returns AST file node when ast option is set to true
  6. transformFileSync minifies code when minified option is set to true
  7. transformFileSync throws an error with ENOENT code when target file does not exist
  8. transformFileSync throws a SyntaxError with BABEL_PARSE_ERROR code when reading a file with invalid JavaScript syntax
  9. transformFileAsync asynchronously transforms JavaScript source file returning a promise resolving to result object
  10. transformFile transforms JavaScript source file using error-first callback convention

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
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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package-lock.json
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      "funding": [
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          "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"
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        "update-browserslist-db": "cli.js"
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      }
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      "license": "ISC"
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  }
}
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"
  ],
  "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 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');
assert.equal(typeof babel.transformFileAsync, 'function', 'babel.transformFileAsync must be a function');
assert.equal(typeof babel.transformFile, 'function', 'babel.transformFile must be a function');

const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'babel-contract-'));
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. transformFileSync synchronously transforms JavaScript source file and returns code string
  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. transformFileSync applies custom AST visitor plugins synchronously to modify AST identifiers in target file
  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. transformFileSync generates source maps referencing input file when sourceMaps option is enabled
  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. transformFileSync returns AST file node when ast option is set to true
  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. transformFileSync minifies code when minified option is set to true
  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');
  assert.ok(!minResult.code.includes('\n') || minResult.code.length < 50, 'minified code should strip formatting');

  // 7. transformFileSync throws an error with ENOENT code when target file does not exist
  let enoentErr = null;
  try {
    babel.transformFileSync(path.join(tempDir, 'does-not-exist.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. transformFileSync throws a SyntaxError with BABEL_PARSE_ERROR code when reading a file with invalid JavaScript syntax
  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');

  // 9. transformFileAsync asynchronously transforms JavaScript source file returning a promise resolving to result object
  const asyncResult = await babel.transformFileAsync(validFile, {
    configFile: false,
    babelrc: false
  });
  assert.ok(asyncResult, 'transformFileAsync must resolve to result object');
  assert.equal(typeof asyncResult.code, 'string', 'transformFileAsync result must contain code string');
  assert.ok(asyncResult.code.includes('const OLD_NAME = 42;'), 'async result should preserve code semantics');

  // 10. transformFile transforms JavaScript source file using error-first callback convention
  const cbResult = await new Promise((resolve, reject) => {
    babel.transformFile(validFile, { configFile: false, babelrc: false }, (err, res) => {
      if (err) reject(err);
      else resolve(res);
    });
  });
  assert.ok(cbResult, 'transformFile callback must receive result object');
  assert.equal(typeof cbResult.code, 'string', 'callback result must contain code string');
  assert.ok(cbResult.code.includes('const OLD_NAME = 42;'), 'callback result should preserve code semantics');

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

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