Ejemplo

@babel/plugin-transform-block-scoped-functions 7.29.7

Muestra verificada para npm @babel/plugin-transform-block-scoped-functions 7.29.7. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó.

sha256:df0288ab3b1c4cf320d917b684bdb29da0bdfa414e7db119c7dbe046c972519f

MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia: Contrato firmado aprobado
Recibos de verificación: 1
Claves de firma que lo compilaron: 1

Entorno declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Entornos de las ejecuciones de verificación

Entorno	Contrato	Etapas	Ejecución
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

Caso

HOW

Objetivo: verify pkg:npm/%40babel/plugin-transform-block-scoped-functions@7.29.7
Paquetes: @babel/plugin-transform-block-scoped-functions 7.29.7
Creado: 2026-08-21T06:27:37Z

Contrato

Plugin default export is a function factory asserting Babel 7 compatibility
Plugin factory returns an object named transform-block-scoped-functions with BlockStatement and SwitchCase visitor methods
BlockStatement visitor transforms function declarations in block scopes into let variable declarations with blockHoist 2
BlockStatement visitor preserves non-function statements without modification
BlockStatement visitor ignores direct function body blocks and export declaration parents
SwitchCase visitor transforms function declarations inside switch case consequents into let variable declarations
Module helpers instantiate the plugin and execute block-scoped function AST transformations

Archivos

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

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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-scoped-functions@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-block-scoped-functions@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-scoped-functions",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/plugin-transform-block-scoped-functions": "7.29.7"
  }
}

spec.json

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-block-scoped-functions@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-block-scoped-functions@7.29.7"
  ]
}

src/index.mjs

import blockScopedFunctionsPlugin from '@babel/plugin-transform-block-scoped-functions';

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

/**
 * Transforms an AST path using the block-scoped-functions visitor.
 * @param {object} pluginInstance - Plugin instance returned by createBlockScopedFunctionsPlugin.
 * @param {'BlockStatement'|'SwitchCase'} nodeType - The AST node type to process.
 * @param {object} path - Mock or real Babel AST path.
 */
export function applyBlockScopedTransform(pluginInstance, nodeType, path) {
  if (pluginInstance.visitor && typeof pluginInstance.visitor[nodeType] === 'function') {
    pluginInstance.visitor[nodeType](path);
  }
}

test/contract.mjs

import assert from 'node:assert/strict';
import blockScopedFunctionsPlugin from '@babel/plugin-transform-block-scoped-functions';
import { createBlockScopedFunctionsPlugin, applyBlockScopedTransform } from '../src/index.mjs';

// 1. Verify default export is the plugin factory function
const plugin = blockScopedFunctionsPlugin.default || blockScopedFunctionsPlugin;
assert.equal(typeof plugin, 'function', 'Default export must be a plugin factory function');

// 2. Verify assertVersion check and plugin structure
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-scoped-functions', 'Plugin name must be transform-block-scoped-functions');
assert.equal(typeof instance.visitor, 'object', 'Plugin must provide a visitor object');
assert.equal(typeof instance.visitor.BlockStatement, 'function', 'Visitor must provide BlockStatement method');
assert.equal(typeof instance.visitor.SwitchCase, 'function', 'Visitor must provide SwitchCase method');

// Helper to construct a mock FunctionDeclaration path
function createMockFunctionPath(name) {
  const funcNode = {
    type: 'FunctionDeclaration',
    id: { type: 'Identifier', name },
    params: [],
    body: { type: 'BlockStatement', body: [] },
    async: false,
    generator: false
  };
  let replacedWith = null;
  const path = {
    node: funcNode,
    isFunctionDeclaration: () => true,
    replaceWith: (newNode) => {
      replacedWith = newNode;
    },
    getReplacedNode: () => replacedWith
  };
  return path;
}

// 3. Verify BlockStatement transforms function declarations into let variable declarations
{
  const funcPath = createMockFunctionPath('innerFunc');
  const blockPath = {
    node: { type: 'BlockStatement', body: [funcPath.node] },
    parent: { type: 'Program' },
    get: (prop) => (prop === 'body' ? [funcPath] : [])
  };

  instance.visitor.BlockStatement(blockPath);

  const replaced = funcPath.getReplacedNode();
  assert.ok(replaced, 'Function declaration in block must be replaced');
  assert.equal(replaced.type, 'VariableDeclaration', 'Replacement must be a VariableDeclaration');
  assert.equal(replaced.kind, 'let', 'Replacement declaration kind must be let');
  assert.equal(replaced._blockHoist, 2, 'Replacement declaration must have _blockHoist set to 2');
  assert.equal(replaced.declarations.length, 1, 'Replacement must have one declarator');
  assert.equal(replaced.declarations[0].id.name, 'innerFunc', 'Declarator id must preserve original function name');
  assert.equal(funcPath.node.id, null, 'Original function node id must be anonymized to null');
  assert.equal(replaced.declarations[0].init.type, 'FunctionExpression', 'Declarator init must be a FunctionExpression');
}

// 4. Verify BlockStatement preserves non-function statements without modification
{
  let replaced = false;
  const exprPath = {
    node: { type: 'ExpressionStatement' },
    isFunctionDeclaration: () => false,
    replaceWith: () => {
      replaced = true;
    }
  };
  const blockPath = {
    node: { type: 'BlockStatement', body: [exprPath.node] },
    parent: { type: 'Program' },
    get: (prop) => (prop === 'body' ? [exprPath] : [])
  };

  instance.visitor.BlockStatement(blockPath);
  assert.equal(replaced, false, 'Non-function statements must not be replaced');
}

// 5. Verify BlockStatement ignores direct function body blocks and export declarations
{
  const funcPath = createMockFunctionPath('inFunctionBody');
  const blockNode = { type: 'BlockStatement', body: [funcPath.node] };
  const parentFunction = { type: 'FunctionDeclaration', body: blockNode };

  const functionBodyBlockPath = {
    node: blockNode,
    parent: parentFunction,
    get: (prop) => (prop === 'body' ? [funcPath] : [])
  };

  instance.visitor.BlockStatement(functionBodyBlockPath);
  assert.equal(funcPath.getReplacedNode(), null, 'Direct function body block must not be transformed');

  const exportFuncPath = createMockFunctionPath('inExport');
  const exportBlockNode = { type: 'BlockStatement', body: [exportFuncPath.node] };
  const parentExport = { type: 'ExportNamedDeclaration' };

  const exportBlockPath = {
    node: exportBlockNode,
    parent: parentExport,
    get: (prop) => (prop === 'body' ? [exportFuncPath] : [])
  };

  instance.visitor.BlockStatement(exportBlockPath);
  assert.equal(exportFuncPath.getReplacedNode(), null, 'Block inside export declaration must not be transformed');
}

// 6. Verify SwitchCase transforms function declarations inside case consequent
{
  const caseFuncPath = createMockFunctionPath('caseScopedFunc');
  const switchCasePath = {
    node: { type: 'SwitchCase', test: null, consequent: [caseFuncPath.node] },
    get: (prop) => (prop === 'consequent' ? [caseFuncPath] : [])
  };

  instance.visitor.SwitchCase(switchCasePath);

  const replaced = caseFuncPath.getReplacedNode();
  assert.ok(replaced, 'Function declaration in switch case must be replaced');
  assert.equal(replaced.type, 'VariableDeclaration');
  assert.equal(replaced.kind, 'let');
  assert.equal(replaced._blockHoist, 2);
  assert.equal(replaced.declarations[0].id.name, 'caseScopedFunc');
  assert.equal(caseFuncPath.node.id, null);
}

// 7. Verify helper functions from src/index.mjs
{
  const helperInstance = createBlockScopedFunctionsPlugin();
  assert.equal(helperInstance.name, 'transform-block-scoped-functions');

  const helperFuncPath = createMockFunctionPath('helperTestFunc');
  const helperBlockPath = {
    node: { type: 'BlockStatement', body: [helperFuncPath.node] },
    parent: { type: 'IfStatement' },
    get: (prop) => (prop === 'body' ? [helperFuncPath] : [])
  };

  applyBlockScopedTransform(helperInstance, 'BlockStatement', helperBlockPath);
  const replaced = helperFuncPath.getReplacedNode();
  assert.ok(replaced, 'Helper function must execute transformation successfully');
  assert.equal(replaced.kind, 'let');
  assert.equal(replaced.declarations[0].id.name, 'helperTestFunc');
}

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

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