CodeSampleX

Exemplo

@babel/core 7.29.6: transformFileSync

Amostra verificada para npm @babel/core 7.29.6: transformFileSync. O contrato rodou em node 22 · linux debian/x64 · docker e passou.

sha256:59473fd9d98b75f6520e0987a851546789e7572a2b7aa1b410e7cb3320fbe553

Esta rede oferece uma coisa: uma amostra que compila. Ela a executou em um sandbox e guardou o recibo assinado. Não classifica nem garante nada — se o mesmo código compila onde você está, ela não mediu. Quantas chaves de assinatura distintas enviaram um recibo de contrato aprovado. Uma é só o autor; mais de uma significa que outra pessoa também o compilou. Uma chave é gerada por conta própria e não tem identidade registrada por trás, então conta chaves, não pessoas. MIT-0

Evidência de execução

O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.

Base da evidência
Contrato assinado aprovado
Recibos de verificação
1
Chaves de assinatura que o compilaram
1
Ambiente declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Ambientes das execuções de verificação

Ambiente Contrato Etapas Execução
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

Caso

HOW
Objetivo
verify @babel/core.transformFileSync in pkg:npm/%40babel/core@7.29.6
Pacotes
Símbolos
  • transformFileSync
Criado
2026-09-03T09:58:42Z

Contrato

  1. babel.transformFileSync is exported as a function by @babel/core and transforms JavaScript files into generated code
  2. transformFileSync returns null for result.ast by default when options.ast is omitted or false
  3. transformFileSync returns the transformed File AST node on result.ast when options.ast is set to true
  4. transformFileSync applies plugin visitors to transform AST nodes and produces modified output code
  5. transformFileSync produces source map mappings when options.sourceMaps is enabled
  6. transformFileSync returns null when the input filename matches an ignore pattern
  7. transformFileSync throws an error with code ENOENT when attempting to transform a nonexistent file
  8. transformFileSync throws a SyntaxError with BABEL_PARSE_ERROR code when the target file contains invalid JavaScript syntax

Arquivos

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • test/contract.mjs
  • test/fixtures/invalid.js
  • test/fixtures/valid.js

Baixar o artefato de código-fonte (tar.gz)

Código-fonte

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.transformFileSync in pkg:npm/%40babel/core@7.29.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.29.6
Demonstrate these symbols/APIs:
  - transformFileSync

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-core-transform-file-sync",
  "version": "1.0.0",
  "description": "verify @babel/core.transformFileSync in pkg:npm/%40babel/core@7.29.6",
  "type": "module",
  "main": "src/index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/core": "7.29.6"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @babel/core.transformFileSync in pkg:npm/%40babel/core@7.29.6",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.6"
  ],
  "symbols": [
    "transformFileSync"
  ]
}
src/index.mjs
import * as babel from "@babel/core";

/**
 * Transforms a file synchronously using @babel/core.transformFileSync.
 *
 * @param {string} filename - Path to the file to transform.
 * @param {object} [options={}] - Additional Babel transform options.
 * @returns {object|null} The transformation result containing code, map, and ast.
 */
export function transformFile(filename, options = {}) {
  const finalOptions = {
    configFile: false,
    babelrc: false,
    ...options,
  };
  return babel.transformFileSync(filename, finalOptions);
}

/**
 * Transforms a file with a specific plugin visitor function.
 *
 * @param {string} filename - Path to the file to transform.
 * @param {Function|object} plugin - Babel plugin function or object.
 * @param {object} [options={}] - Additional options.
 * @returns {string} The transformed code string.
 */
export function transformFileWithPlugin(filename, plugin, options = {}) {
  const result = transformFile(filename, {
    plugins: [plugin],
    ...options,
  });
  return result ? result.code : "";
}

/**
 * Transforms a file and requests the AST in the result.
 *
 * @param {string} filename - Path to the file to transform.
 * @param {object} [options={}] - Additional options.
 * @returns {object|null} The transformed AST node from result.ast.
 */
export function transformFileToAst(filename, options = {}) {
  const result = transformFile(filename, {
    ast: true,
    code: false,
    ...options,
  });
  return result ? result.ast : null;
}

/**
 * Transforms a file and generates an associated source map.
 *
 * @param {string} filename - Path to the file to transform.
 * @param {object} [options={}] - Additional options.
 * @returns {{code: string, map: object|null}} Generated code and source map object.
 */
export function transformFileWithSourceMap(filename, options = {}) {
  const result = transformFile(filename, {
    sourceMaps: true,
    ...options,
  });
  return {
    code: result ? result.code : "",
    map: result ? result.map : null,
  };
}

export { babel };
test/contract.mjs
import assert from "node:assert/strict";
import path from "node:path";
import { fileURLToPath } from "node:url";
import * as babel from "@babel/core";
import {
  transformFile,
  transformFileWithPlugin,
  transformFileToAst,
  transformFileWithSourceMap,
} from "../src/index.mjs";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const validFixture = path.join(__dirname, "fixtures", "valid.js");
const invalidFixture = path.join(__dirname, "fixtures", "invalid.js");
const nonexistentFixture = path.join(__dirname, "fixtures", "does_not_exist.js");

function runContracts() {
  // Contract 1: babel.transformFileSync is exported as a function by @babel/core and transforms JavaScript files into generated code
  {
    assert.strictEqual(
      typeof babel.transformFileSync,
      "function",
      "babel.transformFileSync must be a function"
    );

    const result = babel.transformFileSync(validFixture, {
      configFile: false,
      babelrc: false,
    });

    assert.ok(result !== null, "transformFileSync must return a result object");
    assert.strictEqual(typeof result.code, "string", "result.code must be a string");
    assert.ok(result.code.includes("const message = \"hello\";"), "result.code must contain source code");
  }

  // Contract 2: transformFileSync returns null for result.ast by default when options.ast is omitted or false
  {
    const result = transformFile(validFixture);
    assert.ok(result !== null, "result must not be null");
    assert.strictEqual(result.ast, null, "result.ast must be strictly null by default");
    assert.strictEqual(typeof result.code, "string", "result.code must be present");
  }

  // Contract 3: transformFileSync returns the transformed File AST node on result.ast when options.ast is set to true
  {
    const ast = transformFileToAst(validFixture);
    assert.ok(ast !== null, "ast must not be null");
    assert.strictEqual(ast.type, "File", "returned AST must have type 'File'");
    assert.ok(ast.program, "returned AST must have a program node");
    assert.strictEqual(ast.program.body[0].type, "VariableDeclaration");
  }

  // Contract 4: transformFileSync applies plugin visitors to transform AST nodes and produces modified output code
  {
    const renamePlugin = () => ({
      visitor: {
        Identifier(p) {
          if (p.node.name === "message") {
            p.node.name = "greeting";
          }
        },
      },
    });

    const output = transformFileWithPlugin(validFixture, renamePlugin);
    assert.ok(output.includes("const greeting = \"hello\";"), "output must reflect plugin transformations");
    assert.ok(!output.includes("const message = \"hello\";"), "original identifier must be replaced");
  }

  // Contract 5: transformFileSync produces source map mappings when options.sourceMaps is enabled
  {
    const { code, map } = transformFileWithSourceMap(validFixture);
    assert.ok(typeof code === "string" && code.length > 0, "code must be generated");
    assert.ok(map !== null, "map must not be null");
    assert.strictEqual(map.version, 3, "source map version must be 3");
    assert.ok(Array.isArray(map.sources), "map sources must be an array");
    assert.ok(map.sources.some((s) => s.includes("valid.js")), "sources must include valid.js");
  }

  // Contract 6: transformFileSync returns null when the input filename matches an ignore pattern
  {
    const result = transformFile(validFixture, {
      ignore: [/valid\.js$/],
    });
    assert.strictEqual(result, null, "transformFileSync must return null when file matches ignore regex");
  }

  // Contract 7: transformFileSync throws an error with code ENOENT when attempting to transform a nonexistent file
  {
    assert.throws(
      () => {
        transformFile(nonexistentFixture);
      },
      (err) => {
        return err.code === "ENOENT";
      },
      "transformFileSync must throw an error with code ENOENT for missing files"
    );
  }

  // Contract 8: transformFileSync throws a SyntaxError with BABEL_PARSE_ERROR code when the target file contains invalid JavaScript syntax
  {
    assert.throws(
      () => {
        transformFile(invalidFixture);
      },
      (err) => {
        return err.name === "SyntaxError" && err.code === "BABEL_PARSE_ERROR";
      },
      "transformFileSync must throw a SyntaxError with code BABEL_PARSE_ERROR on parse error"
    );
  }

  console.log("All contracts passed successfully.");
}

runContracts();
test/fixtures/invalid.js
const = 42;
test/fixtures/valid.js
const message = "hello";
export default message;

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