CodeSampleX

サンプル

@babel/core 7.29.6: transformSync

検証済みサンプル — npm @babel/core 7.29.6: transformSync. node 22 · linux debian/x64 · docker で contract を実行し、成功しました: babel.transformSync is exported as a function…

sha256:600b2ed5c17b30fc1241e8fcaf794bb0e586953e9ee6fdb1b208891c1fc59a2d

このネットワークが提供するのは一つだけです。ビルドされるサンプル。サンドボックスで実行し、署名済みの受領証を保管します。等級はつけず、何も保証しません — 同じコードがあなたの環境でビルドされるかは測定していません。 合格した契約受領証を提出した異なる署名鍵の数です。1 なら作者だけ、2 以上なら他の誰かもビルドしています。鍵は自己生成で背後に登録された身元がないため、数えているのは人ではなく鍵です。 MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

証拠の基準
署名済みコントラクト合格
検証レシート
1
ビルドした署名鍵
1
宣言された環境 linux 24 · ubuntu · glibc 2.39 x64 npm

検証実行環境

環境 コントラクト ステージ 実行日
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

ケース

HOW
ゴール
verify pkg:npm/%40babel/core@7.29.6
パッケージ
シンボル
  • transformSync
作成日
2026-09-03T10:03:38Z

コントラクト

  1. babel.transformSync is exported as a function by @babel/core and transforms JavaScript source code into generated code string
  2. transformSync returns null for result.ast by default when options.ast is omitted or false
  3. transformSync returns the transformed File AST node on result.ast when options.ast is set to true
  4. transformSync applies custom plugin visitors synchronously to modify AST nodes and generates modified output code
  5. transformSync produces source map mappings when options.sourceMaps is enabled
  6. transformSync returns minified output code without comments when minified option is true
  7. transformSync returns null when filename matches configured ignore pattern
  8. transformSync throws a SyntaxError with BABEL_PARSE_ERROR code when given invalid JavaScript syntax

ファイル

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

ソースアーティファクトをダウンロード (tar.gz)

ソース

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@7.29.6
Kind: HOW

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

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
{"case":{"caseId":"case:sha256:667c50c563df1dbd8a76693eeff67f0bbdc376320fab6c9cd4876349491556cb","contract":["babel.transformSync is exported as a function by @babel/core and transforms JavaScript source code into generated code string","transformSync returns null for result.ast by default when options.ast is omitted or false","transformSync returns the transformed File AST node on result.ast when options.ast is set to true","transformSync applies custom plugin visitors synchronously to modify AST nodes and generates modified output code","transformSync produces source map mappings when options.sourceMaps is enabled","transformSync returns minified output code without comments when minified option is true","transformSync returns null when filename matches configured ignore pattern","transformSync throws a SyntaxError with BABEL_PARSE_ERROR code when given invalid JavaScript syntax"],"goal":"verify pkg:npm/%40babel/core@7.29.6","kind":"HOW","packages":["pkg:npm/%40babel/core@7.29.6"],"schemaVersion":1,"symbols":["transformSync"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/core@7.29.6"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.29.6","symbols":["transformSync"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-babel-core-transformsync",
  "version": "1.0.0",
  "description": "verify @babel/core.transformSync 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 pkg:npm/%40babel/core@7.29.6",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.6"
  ],
  "symbols": [
    "transformSync"
  ]
}
src/index.mjs
import * as babel from "@babel/core";

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

/**
 * Transforms code synchronously applying a custom visitor plugin.
 *
 * @param {string} code - The source code to transform.
 * @param {object|Function} plugin - Babel plugin function or object.
 * @param {object} [options={}] - Additional options.
 * @returns {string} The transformed code string.
 */
export function transformWithPlugin(code, plugin, options = {}) {
  const result = transformCode(code, {
    plugins: [plugin],
    ...options,
  });
  return result ? result.code : "";
}

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

/**
 * Transforms code and generates a v3 source map.
 *
 * @param {string} code - The source code to transform.
 * @param {string} [filename="source.js"] - Virtual filename for source mapping.
 * @param {object} [options={}] - Additional options.
 * @returns {{code: string, map: object|null}} Generated code and source map object.
 */
export function transformWithSourceMap(code, filename = "source.js", options = {}) {
  const result = transformCode(code, {
    filename,
    sourceMaps: true,
    ...options,
  });
  return {
    code: result ? result.code : "",
    map: result ? result.map : null,
  };
}

/**
 * Transforms code with minified output.
 *
 * @param {string} code - The source code to transform.
 * @param {object} [options={}] - Additional options.
 * @returns {string} The minified code string.
 */
export function transformMinified(code, options = {}) {
  const result = transformCode(code, {
    minified: true,
    comments: false,
    ...options,
  });
  return result ? result.code : "";
}

export { babel };
test/contract.mjs
import assert from "node:assert/strict";
import * as babel from "@babel/core";
import {
  transformCode,
  transformWithPlugin,
  transformToAst,
  transformWithSourceMap,
  transformMinified,
} from "../src/index.mjs";

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

    const input = 'const x = 1 + 2;';
    const result = transformCode(input);
    assert.ok(result !== null, "transformSync must return a result object");
    assert.strictEqual(typeof result.code, "string", "result.code must be a string");
    assert.ok(result.code.includes("const x = 1 + 2;"), "result.code must contain code");
  }

  // Contract 2: transformSync returns null for result.ast by default when options.ast is omitted or false
  {
    const input = 'const value = 42;';
    const result = transformCode(input);
    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: transformSync returns the transformed File AST node on result.ast when options.ast is set to true
  {
    const input = 'const greeting = "hello";';
    const ast = transformToAst(input);
    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.type, "Program");
    assert.strictEqual(ast.program.body[0].type, "VariableDeclaration");
  }

  // Contract 4: transformSync applies custom plugin visitors synchronously to modify AST nodes and generates modified output code
  {
    const input = 'const oldName = 100;';
    const renamePlugin = () => ({
      visitor: {
        Identifier(path) {
          if (path.node.name === "oldName") {
            path.node.name = "newName";
          }
        },
      },
    });

    const output = transformWithPlugin(input, renamePlugin);
    assert.ok(output.includes("const newName = 100;"), "output must reflect plugin transformation");
    assert.ok(!output.includes("oldName"), "original identifier must not be present");
  }

  // Contract 5: transformSync produces source map mappings when options.sourceMaps is enabled
  {
    const input = 'function multiply(a, b) { return a * b; }';
    const { code, map } = transformWithSourceMap(input, "calc.js");
    assert.ok(typeof code === "string" && code.length > 0, "code must be generated");
    assert.ok(map !== null && typeof map === "object", "map must be generated");
    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.includes("calc.js"), "sources must include calc.js");
    assert.strictEqual(typeof map.mappings, "string", "mappings must be a string");
  }

  // Contract 6: transformSync returns minified output code without comments when minified option is true
  {
    const input = '// this is a comment\nfunction test(x) {\n  return x * 2;\n}';
    const output = transformMinified(input);
    assert.ok(typeof output === "string", "minified output must be string");
    assert.ok(!output.includes("// this is a comment"), "comments must be removed");
    assert.ok(!output.includes("\n"), "output must not contain newlines");
    assert.ok(output.includes("function test(x){return x*2}"), "code must be minified");
  }

  // Contract 7: transformSync returns null when filename matches configured ignore pattern
  {
    const result = transformCode("const ignored = true;", {
      filename: "ignored.js",
      ignore: ["ignored.js"],
    });
    assert.strictEqual(result, null, "transformSync must return null for ignored files");
  }

  // Contract 8: transformSync throws a SyntaxError with BABEL_PARSE_ERROR code when given invalid JavaScript syntax
  {
    assert.throws(
      () => {
        transformCode("const = 123;");
      },
      (err) => {
        return err.name === "SyntaxError" && err.code === "BABEL_PARSE_ERROR";
      },
      "transformSync must throw a SyntaxError with code BABEL_PARSE_ERROR on parse error"
    );
  }

  console.log("All contract assertions passed successfully.");
}

runContracts();

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