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

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.

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{
  "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"
  }
}

{
  "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"
  ]
}

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);
  }
}

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.');