CodeSampleX

Exemple

@babel/plugin-transform-block-scoping 7.29.7

Échantillon vérifié pour npm @babel/plugin-transform-block-scoping 7.29.7. Le contrat s'est exécuté sur node 22 · linux alpine/x64 · docker et a réussi.

sha256:fca2a5682d1e858797af93ac7045bd285a03b3e6a01e5f4f47a7144d84ea5b72

Ce réseau offre une seule chose : un échantillon qui compile. Il l'a exécuté dans un bac à sable et conservé le reçu signé. Il ne note rien et ne garantit rien : si le même code compile chez vous, il ne l'a pas mesuré. Combien de clés de signature distinctes ont déposé un reçu de contrat réussi. Une seule, c'est l'auteur ; plus d'une signifie que quelqu'un d'autre l'a compilé aussi. Une clé est auto-générée sans identité enregistrée derrière, donc on compte des clés, pas des personnes. MIT-0

Preuves d'exécution

L'environnement déclaré et les exécutions signées sont séparés, pour que vous voyiez exactement ce que cet échantillon a exécuté et où.

Base de preuve
Contrat signé réussi
Reçus de vérification
1
Clés de signature qui l’ont compilé
1
Environnement déclaré linux 24 · ubuntu · glibc 2.39 x64 npm

Environnements des exécutions de vérification

Environnement Contrat Étapes Exécution
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-27

Cas

HOW
Objectif
verify pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7
Paquets
Créé
2026-08-27T22:12:03Z

Contrat

  1. Plugin default export is a function factory asserting Babel 7 compatibility
  2. Plugin factory returns an object named transform-block-scoping with visitors for variable declarations and loop statements
  3. Plugin validates throwIfClosureRequired option to be a boolean, throwing an error otherwise
  4. Plugin validates tdz option to be a boolean, throwing an error otherwise
  5. VariableDeclaration visitor transforms block-scoped let declarations to var and moves binding to outer var scope
  6. VariableDeclaration visitor renames shadowed block-scoped variables when parent scope contains matching identifiers
  7. VariableDeclaration visitor preserves standard var declarations without modifying scope
  8. Module helpers instantiate the plugin, validate options, and execute variable declaration AST transformations

Fichiers

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

Télécharger l’artefact source (tar.gz)

Code 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/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

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-plugin-transform-block-scoping",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "license": "MIT-0",
  "dependencies": {
    "@babel/plugin-transform-block-scoping": "7.29.7"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-block-scoping@7.29.7"
  ]
}
src/index.mjs
import blockScopingPlugin from '@babel/plugin-transform-block-scoping';

/**
 * Creates and initializes the block-scoping plugin instance.
 * @param {object} [api] - Optional Babel API object with assertVersion.
 * @param {object} [options] - Optional plugin options (throwIfClosureRequired, tdz).
 * @returns {object} Plugin instance object with name and visitor.
 */
export function createBlockScopingPlugin(api, options = {}) {
  const plugin = blockScopingPlugin.default || blockScopingPlugin;
  const babelApi = api || {
    assertVersion: (range) => Boolean(range)
  };
  return plugin(babelApi, options);
}

/**
 * Transforms a variable declaration AST path using the block-scoping visitor.
 * @param {object} pluginInstance - Plugin instance returned by createBlockScopingPlugin.
 * @param {object} path - Mock or real Babel AST path.
 * @param {object} [state] - Optional Babel plugin pass state.
 */
export function applyVariableDeclarationTransform(pluginInstance, path, state = {}) {
  if (pluginInstance.visitor && pluginInstance.visitor.VariableDeclaration) {
    const visitor = pluginInstance.visitor.VariableDeclaration;
    const handlers = Array.isArray(visitor.enter) ? visitor.enter : [visitor];
    for (const fn of handlers) {
      if (typeof fn === 'function') {
        fn(path, state);
      }
    }
  }
}

/**
 * Validates plugin configuration options by attempting to instantiate the plugin.
 * @param {object} options - Plugin options to validate.
 * @returns {boolean} True if options are valid.
 */
export function validatePluginOptions(options = {}) {
  const plugin = blockScopingPlugin.default || blockScopingPlugin;
  const mockApi = { assertVersion: () => true };
  plugin(mockApi, options);
  return true;
}
test/contract.mjs
import assert from 'node:assert/strict';
import blockScopingPlugin from '@babel/plugin-transform-block-scoping';
import {
  createBlockScopingPlugin,
  applyVariableDeclarationTransform,
  validatePluginOptions
} from '../src/index.mjs';

// 1. Verify default export is a function factory asserting Babel version 7
const plugin = blockScopingPlugin.default || blockScopingPlugin;
assert.equal(typeof plugin, 'function', 'Plugin export must be a function');

let assertedVersion = null;
const mockApi = {
  assertVersion(version) {
    assertedVersion = version;
  }
};
const instance = plugin(mockApi, {});
assert.equal(assertedVersion, 7, 'Plugin must assert Babel version 7 compatibility');
assert.equal(typeof instance, 'object', 'Plugin factory must return an object');
assert.equal(instance.name, 'transform-block-scoping', 'Plugin name must be transform-block-scoping');
assert.equal(typeof instance.visitor, 'object', 'Plugin must provide a visitor object');

// 2. Verify visitor methods existence for block scoping constructs
const expectedVisitors = [
  'VariableDeclaration',
  'BlockStatement',
  'SwitchCase',
  'ClassDeclaration',
  'DoWhileStatement',
  'ForInStatement',
  'ForStatement',
  'WhileStatement',
  'ForOfStatement'
];
for (const v of expectedVisitors) {
  assert.ok(instance.visitor[v], 'Visitor must contain ' + v);
}

// 3. Verify options validation: throwIfClosureRequired
assert.throws(
  () => {
    plugin(mockApi, { throwIfClosureRequired: 'invalid' });
  },
  {
    name: 'Error',
    message: '.throwIfClosureRequired must be a boolean, or undefined'
  },
  'Should throw when throwIfClosureRequired is not a boolean'
);

// 4. Verify options validation: tdz
assert.throws(
  () => {
    plugin(mockApi, { tdz: 'invalid' });
  },
  {
    name: 'Error',
    message: '.tdz must be a boolean, or undefined'
  },
  'Should throw when tdz is not a boolean'
);

// 5. Verify VariableDeclaration transforms let declaration to var and moves binding
{
  let movedTo = null;
  const varScope = { id: 'programScope' };
  const blockScope = {
    id: 'blockScope',
    getFunctionParent: () => null,
    getProgramParent: () => varScope,
    parent: {
      hasBinding: () => false,
      hasGlobal: () => false
    },
    getOwnBinding: (name) => ({ kind: 'let' }),
    getBinding: (name) => null,
    moveBindingTo: (name, target) => {
      movedTo = target;
    },
    path: {
      traverse: () => {}
    }
  };

  const declNode = {
    type: 'VariableDeclaration',
    kind: 'let',
    declarations: [
      { type: 'VariableDeclarator', id: { type: 'Identifier', name: 'scopedVar' }, init: null }
    ]
  };

  const declPath = {
    node: declNode,
    parentPath: null,
    scope: blockScope,
    find: () => true,
    getBindingIdentifiers: () => ({ scopedVar: declNode.declarations[0].id })
  };

  for (const fn of instance.visitor.VariableDeclaration.enter) {
    fn(declPath, {});
  }

  assert.equal(declNode.kind, 'var', 'let declaration must be transformed to var');
  assert.equal(movedTo, varScope, 'binding must be moved to outer var scope');
}

// 6. Verify VariableDeclaration renames shadowed block-scoped variables
{
  let renamedOld = null;
  let renamedNew = null;
  let movedBinding = null;
  const varScope = { id: 'functionScope' };
  const blockScope = {
    id: 'innerBlockScope',
    getFunctionParent: () => varScope,
    getProgramParent: () => null,
    parent: {
      hasBinding: (name) => name === 'shadowed',
      hasGlobal: () => false
    },
    generateUid: (name) => '_' + name,
    rename: (oldName, newName) => {
      renamedOld = oldName;
      renamedNew = newName;
    },
    getOwnBinding: (name) => ({ kind: 'let' }),
    getBinding: (name) => null,
    moveBindingTo: (name, target) => {
      movedBinding = { name, target };
    },
    path: {
      traverse: () => {}
    }
  };

  const declNode = {
    type: 'VariableDeclaration',
    kind: 'let',
    declarations: [
      { type: 'VariableDeclarator', id: { type: 'Identifier', name: 'shadowed' }, init: null }
    ]
  };

  const declPath = {
    node: declNode,
    parentPath: null,
    scope: blockScope,
    find: () => true,
    getBindingIdentifiers: () => ({ shadowed: declNode.declarations[0].id })
  };

  for (const fn of instance.visitor.VariableDeclaration.enter) {
    fn(declPath, {});
  }

  assert.equal(declNode.kind, 'var', 'kind must be transformed to var');
  assert.equal(renamedOld, 'shadowed', 'old name must be renamed');
  assert.equal(renamedNew, '_shadowed', 'new name must be uid-prefixed');
  assert.equal(movedBinding.name, '_shadowed', 'renamed binding must be moved to varScope');
  assert.equal(movedBinding.target, varScope, 'target must be varScope');
}

// 7. Verify VariableDeclaration ignores var declarations
{
  const varDeclNode = {
    type: 'VariableDeclaration',
    kind: 'var',
    declarations: [
      { type: 'VariableDeclarator', id: { type: 'Identifier', name: 'existingVar' }, init: null }
    ]
  };
  let scopeCrawled = false;
  const varPath = {
    node: varDeclNode,
    parentPath: null,
    scope: {
      crawl: () => { scopeCrawled = true; }
    },
    find: () => true,
    getBindingIdentifiers: () => ({ existingVar: varDeclNode.declarations[0].id })
  };

  for (const fn of instance.visitor.VariableDeclaration.enter) {
    fn(varPath, {});
  }

  assert.equal(varDeclNode.kind, 'var', 'var declaration must remain var');
  assert.equal(scopeCrawled, false, 'scope must not be modified for var declaration');
}

// 8. Verify helper functions from src/index.mjs
{
  const helperInstance = createBlockScopingPlugin();
  assert.equal(helperInstance.name, 'transform-block-scoping', 'Helper plugin must instantiate correctly');
  assert.equal(validatePluginOptions({ throwIfClosureRequired: false, tdz: true }), true);

  let helperMovedTo = null;
  const helperVarScope = { id: 'prog' };
  const helperBlockScope = {
    getFunctionParent: () => null,
    getProgramParent: () => helperVarScope,
    parent: { hasBinding: () => false, hasGlobal: () => false },
    getOwnBinding: () => ({ kind: 'let' }),
    getBinding: () => null,
    moveBindingTo: (name, target) => { helperMovedTo = target; },
    path: { traverse: () => {} }
  };

  const helperDeclNode = {
    type: 'VariableDeclaration',
    kind: 'let',
    declarations: [{ type: 'VariableDeclarator', id: { type: 'Identifier', name: 'helperVar' }, init: null }]
  };
  const helperDeclPath = {
    node: helperDeclNode,
    parentPath: null,
    scope: helperBlockScope,
    find: () => true,
    getBindingIdentifiers: () => ({ helperVar: helperDeclNode.declarations[0].id })
  };

  applyVariableDeclarationTransform(helperInstance, helperDeclPath);
  assert.equal(helperDeclNode.kind, 'var', 'Helper function must transform let to var');
  assert.equal(helperMovedTo, helperVarScope, 'Helper function must move binding to var scope');
}

console.log('Contract assertions passed.');

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