@babel/core 7.29.6: 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 @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.

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{
  "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"
}

{
  "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"
  ]
}

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 };

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();

const = 42;

const message = "hello";
export default message;