샘플

@babel/plugin-transform-block-scoping 7.29.7: default

검증된 샘플 — npm @babel/plugin-transform-block-scoping 7.29.7: default. node 22 · linux alpine/x64 · docker에서 contract를 실행해 통과했습니다.

sha256:5775ef03ed0df970f226908ac48a12694400dc9f829d5dbafbcd28c48908224e

MIT-0

실행 증거

선언된 환경과 서명된 실행을 분리해 두었습니다. 이 샘플이 무엇을 어디서 실행했는지 그대로 볼 수 있습니다.

증거 기준: 서명된 컨트랙트 통과
검증 영수증: 1
빌드한 서명 키: 1

선언된 환경 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

검증 실행 환경

환경	컨트랙트	단계	실행일
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1	2026-08-21

케이스

HOW

목표: verify @babel/plugin-transform-block-scoping.default in pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7
패키지: @babel/plugin-transform-block-scoping 7.29.7
심벌: @babel/plugin-transform-block-scoping.default
환경: node 22.23.2
생성일: 2026-08-21T06:33:52Z

컨트랙트

transformBlockScoping transforms let and const variable declarations into var
transformBlockScoping renames colliding variable identifiers across nested block scopes
transformBlockScoping wraps loop body in a closure function when loop variable is captured
transformBlockScoping throwIfClosureRequired option throws error when loop closure is needed
transformBlockScoping preserves variable scoping and closure execution semantics in runtime

파일

PROMPT.md
csx.json
index.js
package-lock.json
package.json
spec.json
test/contract.js

소스 아티팩트 내려받기 (tar.gz)

소스

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/plugin-transform-block-scoping.default in pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7
Demonstrate these symbols/APIs:
  - @babel/plugin-transform-block-scoping.default

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:b376a8920e503d8ec5d6611880e4d80d732eedd36595d2f1d1702a74b1ab0215","contract":["transformBlockScoping transforms let and const variable declarations into var","transformBlockScoping renames colliding variable identifiers across nested block scopes","transformBlockScoping wraps loop body in a closure function when loop variable is captured","transformBlockScoping throwIfClosureRequired option throws error when loop closure is needed","transformBlockScoping preserves variable scoping and closure execution semantics in runtime"],"goal":"verify @babel/plugin-transform-block-scoping.default in pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7","kind":"HOW","packages":["pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7"],"schemaVersion":1,"symbols":["@babel/plugin-transform-block-scoping.default"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7"],"schemaVersion":1,"subject":"pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7","symbols":["@babel/plugin-transform-block-scoping.default"],"verifierAdapter":"node-typescript@1"}

index.js

const babel = require('@babel/core');
const blockScopingPlugin = require('@babel/plugin-transform-block-scoping');

/**
 * Transform block-scoped declarations (let, const) to var using @babel/plugin-transform-block-scoping.
 *
 * @param {string} code - The input JavaScript code containing block scopes or let/const declarations.
 * @param {object} [pluginOptions] - Optional configuration options for the plugin (e.g. throwIfClosureRequired, tdz).
 * @param {object} [babelOptions] - Optional Babel compiler options.
 * @returns {string} The transformed JavaScript code.
 */
function transformBlockScoping(code, pluginOptions = {}, babelOptions = {}) {
  const plugin = blockScopingPlugin.default || blockScopingPlugin;
  const plugins = Object.keys(pluginOptions).length > 0
    ? [[plugin, pluginOptions]]
    : [plugin];

  const result = babel.transformSync(code, {
    plugins,
    configFile: false,
    babelrc: false,
    comments: false,
    ...babelOptions
  });

  return result ? result.code : '';
}

module.exports = {
  transformBlockScoping,
  blockScopingPlugin: blockScopingPlugin.default || blockScopingPlugin
};

package-lock.json

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package.json

{
  "name": "sample-babel-plugin-transform-block-scoping",
  "version": "1.0.0",
  "private": true,
  "type": "commonjs",
  "main": "index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.29.7",
    "@babel/plugin-transform-block-scoping": "7.29.7"
  }
}

spec.json

{
  "schemaVersion": 1,
  "goal": "verify @babel/plugin-transform-block-scoping.default in pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7"
  ],
  "symbols": [
    "@babel/plugin-transform-block-scoping.default"
  ]
}

test/contract.js

const assert = require('assert');
const { transformBlockScoping, blockScopingPlugin } = require('../index');

function runContractTests() {
  // 1. Verify plugin export
  assert.strictEqual(typeof blockScopingPlugin, 'function', 'blockScopingPlugin should be a function');

  // 2. Transform let and const variable declarations into var
  const basicCode = 'let count = 10; const maxLimit = 100;';
  const transformedBasic = transformBlockScoping(basicCode);
  assert.ok(transformedBasic.includes('var count = 10;'), 'let declarations should be transformed to var');
  assert.ok(transformedBasic.includes('var maxLimit = 100;'), 'const declarations should be transformed to var');
  assert.ok(!transformedBasic.includes('let '), 'Transformed code should not contain let keyword');
  assert.ok(!transformedBasic.includes('const '), 'Transformed code should not contain const keyword');

  // 3. Rename colliding variable identifiers across nested block scopes
  const nestedScopeCode = [
    'function compute() {',
    '  let val = 1;',
    '  {',
    '    let val = 2;',
    '    val += 10;',
    '  }',
    '  return val;',
    '}'
  ].join('\n');
  const transformedNested = transformBlockScoping(nestedScopeCode);
  assert.ok(transformedNested.includes('var val = 1;'), 'Outer variable should be declared with var');
  assert.ok(transformedNested.includes('var _val = 2;'), 'Inner variable should be renamed to prevent collision');
  assert.ok(transformedNested.includes('_val += 10;'), 'Inner variable updates should use renamed identifier');

  // 4. Wrap loop body in a closure function when loop variable is captured
  const loopClosureCode = [
    'const handlers = [];',
    'for (let i = 0; i < 3; i++) {',
    '  handlers.push(() => i * 2);',
    '}'
  ].join('\n');
  const transformedLoop = transformBlockScoping(loopClosureCode);
  assert.ok(transformedLoop.includes('var _loop = function'), 'Loop body capturing let binding should be wrapped in helper function');
  assert.ok(transformedLoop.includes('_loop(i);'), 'Loop iteration should invoke helper function with loop variable');

  // 5. throwIfClosureRequired option throws error when loop closure is needed
  let threwExpectedError = false;
  try {
    transformBlockScoping(loopClosureCode, { throwIfClosureRequired: true });
  } catch (err) {
    threwExpectedError = true;
    assert.ok(err.message.includes('throwIfClosureRequired'), 'Error message should indicate throwIfClosureRequired constraint');
  }
  assert.strictEqual(threwExpectedError, true, 'transformBlockScoping should throw when throwIfClosureRequired is true and loop closure is needed');

  // 6. Preserve variable scoping and closure execution semantics in runtime
  const runnableNestedCode = `
    ${transformedNested}
    return compute();
  `;
  const computeFn = new Function(runnableNestedCode);
  assert.strictEqual(computeFn(), 1, 'Transformed nested scope code should execute and return outer variable value');

  const runnableLoopCode = `
    ${transformedLoop}
    return handlers.map(fn => fn());
  `;
  const loopFn = new Function(runnableLoopCode);
  assert.deepStrictEqual(loopFn(), [0, 2, 4], 'Transformed loop closure code should capture distinct loop iteration values');

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

runContractTests();

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