@babel/plugin-transform-destructuring 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-destructuring@7.29.7
Kind: HOW

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

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

import * as babel from '@babel/core';
import destructuringPluginPkg, {
  buildObjectExcludingKeys as libBuildObjectExcludingKeys,
  unshiftForXStatementBody as libUnshiftForXStatementBody
} from '@babel/plugin-transform-destructuring';

/**
 * Normalizes and returns the plugin factory function.
 * @returns {Function} Babel plugin factory function.
 */
export function getDestructuringPlugin() {
  return destructuringPluginPkg.default || destructuringPluginPkg;
}

/**
 * Creates and initializes the destructuring plugin instance.
 * @param {object} [api] - Optional Babel API object.
 * @param {object} [options] - Optional plugin options.
 * @returns {object} Plugin instance with name and visitor.
 */
export function createDestructuringPlugin(api, options = {}) {
  const plugin = getDestructuringPlugin();
  const babelApi = api || {
    types: babel.types,
    template: babel.template,
    traverse: babel.traverse,
    assertVersion: (range) => Boolean(range)
  };
  return plugin(babelApi, options);
}

/**
 * Transforms JavaScript source code using @babel/plugin-transform-destructuring.
 * @param {string} source - JavaScript source code to transform.
 * @param {object} [options] - Additional Babel transform options and assumptions.
 * @returns {import('@babel/core').BabelFileResult} Babel transform result object.
 */
export function transformDestructuring(source, options = {}) {
  const plugin = getDestructuringPlugin();
  const { assumptions, pluginOptions = {}, ...babelOptions } = options;
  return babel.transformSync(source, {
    plugins: [[plugin, pluginOptions]],
    assumptions: assumptions || {},
    configFile: false,
    babelrc: false,
    ...babelOptions
  });
}

export const buildObjectExcludingKeys = libBuildObjectExcludingKeys;
export const unshiftForXStatementBody = libUnshiftForXStatementBody;

import assert from 'node:assert/strict';
import * as babel from '@babel/core';
import destructuringPluginPkg, {
  buildObjectExcludingKeys,
  unshiftForXStatementBody
} from '@babel/plugin-transform-destructuring';
import {
  getDestructuringPlugin,
  createDestructuringPlugin,
  transformDestructuring
} from '../src/index.mjs';

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

let assertedVersion = null;
const mockApi = {
  types: babel.types,
  template: babel.template,
  traverse: babel.traverse,
  assertVersion(range) {
    assertedVersion = range;
  }
};
const instance = plugin(mockApi, {});
assert.equal(assertedVersion, 7, 'Plugin must assert Babel version 7 compatibility');

// 2. Plugin factory returns a plugin object named transform-destructuring with required AST visitors
assert.equal(typeof instance, 'object', 'Plugin factory must return an object');
assert.equal(instance.name, 'transform-destructuring', 'Plugin name must be transform-destructuring');
assert.equal(typeof instance.visitor, 'object', 'Plugin must provide visitor object');
assert.equal(typeof instance.visitor.VariableDeclaration, 'function', 'Visitor must provide VariableDeclaration');
assert.equal(typeof instance.visitor.AssignmentExpression, 'function', 'Visitor must provide AssignmentExpression');
assert.equal(typeof instance.visitor.ForXStatement, 'function', 'Visitor must provide ForXStatement');
assert.equal(typeof instance.visitor.CatchClause, 'function', 'Visitor must provide CatchClause');
assert.equal(typeof instance.visitor.ExportNamedDeclaration, 'function', 'Visitor must provide ExportNamedDeclaration');

// 3. Transforms array destructuring with indices, default fallback values, hole skips, and rest elements
{
  const code = `
    function runArray() {
      const sourceArray = [10, 20];
      const [first, , third = 'defaultThird', ...tail] = sourceArray;
      return { first, third, tail };
    }
  `;
  const result = transformDestructuring(code);
  assert.ok(result.code.includes('first ='), 'Transformed code must assign first element');
  assert.ok(result.code.includes('third ='), 'Transformed code must assign third element with fallback');
  const evaluated = new Function(result.code + '; return runArray();')();
  assert.equal(evaluated.first, 10, 'First element must be destructured');
  assert.equal(evaluated.third, 'defaultThird', 'Default fallback value must be applied');
  assert.deepEqual(evaluated.tail, [], 'Rest elements must be empty array');
}

// 4. Transforms object destructuring with property extraction, alias renaming, defaults, and object rest properties
{
  const code = `
    function runObject() {
      const sourceObj = { a: 100, b: 'custom', extra1: true, extra2: 'ignored' };
      const { a, b: aliasB = 'defaultB', missing: missingVal = 'defaultVal', ...restObj } = sourceObj;
      return { a, aliasB, missingVal, restObj };
    }
  `;
  const result = transformDestructuring(code);
  const evaluated = new Function(result.code + '; return runObject();')();
  assert.equal(evaluated.a, 100, 'Direct property must be extracted');
  assert.equal(evaluated.aliasB, 'custom', 'Aliased property must retain original value');
  assert.equal(evaluated.missingVal, 'defaultVal', 'Missing property must receive default value');
  assert.deepEqual(evaluated.restObj, { extra1: true, extra2: 'ignored' }, 'Rest properties must contain non-destructured fields');
}

// 5. Transforms nested destructuring patterns combining array and object structures
{
  const code = `
    function runNested() {
      const data = { profile: { name: 'Alice', items: ['firstItem', 'secondItem'] } };
      const { profile: { name, items: [leadItem, ...subItems] } } = data;
      return { name, leadItem, subItems };
    }
  `;
  const result = transformDestructuring(code);
  const evaluated = new Function(result.code + '; return runNested();')();
  assert.equal(evaluated.name, 'Alice', 'Nested property name must be destructured');
  assert.equal(evaluated.leadItem, 'firstItem', 'Nested array element must be destructured');
  assert.deepEqual(evaluated.subItems, ['secondItem'], 'Nested array rest elements must be extracted');
}

// 6. Transforms assignment expression destructuring with existing variable bindings
{
  const code = `
    function runAssignment() {
      let valA = 0;
      let valB = 0;
      let objX = 0;
      let objY = 0;
      [valA, valB] = [11, 22];
      ({ objX, objY } = { objX: 33, objY: 44 });
      return { valA, valB, objX, objY };
    }
  `;
  const result = transformDestructuring(code);
  const evaluated = new Function(result.code + '; return runAssignment();')();
  assert.deepEqual(evaluated, { valA: 11, valB: 22, objX: 33, objY: 44 }, 'Assignment destructuring must mutate existing bindings');
}

// 7. Transforms destructuring in ForOf loops and CatchClause parameter bindings
{
  const code = `
    function runControlFlow() {
      const loopResults = [];
      const entries = [['k1', 10], ['k2', 20]];
      for (const [k, v] of entries) {
        loopResults.push(k + '=' + v);
      }
      let caughtDetails = null;
      try {
        throw { status: 404, msg: 'NotFound' };
      } catch ({ status, msg }) {
        caughtDetails = status + ':' + msg;
      }
      return { loopResults, caughtDetails };
    }
  `;
  const result = transformDestructuring(code);
  const evaluated = new Function(result.code + '; return runControlFlow();')();
  assert.deepEqual(evaluated.loopResults, ['k1=10', 'k2=20'], 'ForOf destructuring must execute correctly');
  assert.equal(evaluated.caughtDetails, '404:NotFound', 'Catch clause destructuring must extract error properties');
}

// 8. Supports compiler assumptions including iterableIsArray and objectRestNoSymbols
{
  const codeArray = 'const [a, b] = sourceList;';
  const resultOptimized = transformDestructuring(codeArray, {
    assumptions: {
      iterableIsArray: true
    }
  });
  assert.ok(!resultOptimized.code.includes('_toArray'), 'iterableIsArray assumption should eliminate iterator helper');
  assert.ok(resultOptimized.code.includes('sourceList[0]'), 'iterableIsArray assumption should direct-index array');

  const restCode = `
    function runRest() {
      const sourceObj = { a: 1, b: 2, c: 3 };
      const { a, ...rest } = sourceObj;
      return rest;
    }
  `;
  const resultRest = transformDestructuring(restCode, {
    assumptions: {
      objectRestNoSymbols: true
    }
  });
  const evalRest = new Function(resultRest.code + '; return runRest();')();
  assert.deepEqual(evalRest, { b: 2, c: 3 }, 'objectRestNoSymbols assumption must extract plain object keys');
}

// 9. Exports buildObjectExcludingKeys and unshiftForXStatementBody AST manipulation helpers
{
  assert.equal(typeof buildObjectExcludingKeys, 'function', 'buildObjectExcludingKeys must be an exported function');
  assert.equal(typeof unshiftForXStatementBody, 'function', 'unshiftForXStatementBody must be an exported function');

  // Verify buildObjectExcludingKeys constructs AST expression node
  const excludedKeys = [
    { key: babel.types.identifier('excludeMe'), computed: false }
  ];
  const objRef = babel.types.identifier('targetObj');
  const mockScope = {
    block: babel.types.program([]),
    getProgramParent: () => mockScope,
    push: () => {},
    generateUidIdentifier: (name) => babel.types.identifier('_' + name)
  };
  const astExpr = buildObjectExcludingKeys(excludedKeys, objRef, mockScope, (name) => babel.types.identifier('_' + name), true, true);
  assert.ok(astExpr && astExpr.type, 'buildObjectExcludingKeys must return an AST node');

  // Verify unshiftForXStatementBody prepends statement into block
  const loopBodyBlock = babel.types.blockStatement([]);
  const mockStatementPath = {
    ensureBlock: () => {},
    scope: { hasBinding: () => false },
    get: () => ({ scope: { bindings: {} } }),
    node: { body: loopBodyBlock }
  };
  const newStmt = babel.types.expressionStatement(babel.types.stringLiteral('prepended'));
  unshiftForXStatementBody(mockStatementPath, [newStmt]);
  assert.equal(loopBodyBlock.body.length, 1, 'unshiftForXStatementBody must insert statements into body');
  assert.equal(loopBodyBlock.body[0], newStmt, 'unshiftForXStatementBody must prepend statement');
}

// 10. Helper functions correctly initialize plugin and transform JavaScript source code
{
  const helperInstance = createDestructuringPlugin();
  assert.equal(helperInstance.name, 'transform-destructuring', 'Helper plugin must return valid plugin instance');

  const helperPlugin = getDestructuringPlugin();
  assert.equal(typeof helperPlugin, 'function', 'getDestructuringPlugin must return factory function');

  const result = transformDestructuring('function testHelper() { const { success } = { success: true }; return success; }');
  const evaluated = new Function(result.code + '; return testHelper();')();
  assert.equal(evaluated, true, 'Helper transform function must produce functional output code');
}

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