@babel/core 7.29.7: traverse

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/core.traverse in pkg:npm/%40babel/core@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.29.7
Demonstrate these symbols/APIs:
  - @babel/core.traverse

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-core-traverse",
  "version": "1.0.0",
  "description": "verify @babel/core.traverse in pkg:npm/%40babel/core@7.29.7",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/core": "7.29.7"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/core.traverse in pkg:npm/%40babel/core@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.7"
  ],
  "symbols": [
    "@babel/core.traverse"
  ]
}

const babel = require('@babel/core');

/**
 * Traverse an AST with visitor definitions.
 * @param {object} ast - The AST root node.
 * @param {object} visitor - The visitor mapping.
 * @param {object} [scope] - Scope object.
 * @param {*} [state] - Custom state passed to visitor methods.
 * @param {object} [parentPath] - Parent path.
 */
function traverseAst(ast, visitor, scope, state, parentPath) {
  return babel.traverse(ast, visitor, scope, state, parentPath);
}

/**
 * Parse source code into an AST synchronously using @babel/core.
 * @param {string} code - JavaScript source code.
 * @param {object} [options] - Babel parser options.
 * @returns {object} The parsed AST root node.
 */
function parseCode(code, options) {
  return babel.parseSync(code, options);
}

/**
 * Collect all identifier names within an AST in traversal order.
 * @param {object} ast - The AST root node.
 * @returns {string[]} List of identifier names.
 */
function collectIdentifiers(ast) {
  const identifiers = [];
  babel.traverse(ast, {
    Identifier(path) {
      identifiers.push(path.node.name);
    }
  });
  return identifiers;
}

/**
 * Rename a variable/binding across a scope.
 * @param {object} ast - The AST root node.
 * @param {string} oldName - The identifier name to rename.
 * @param {string} newName - The new identifier name.
 */
function renameBindingInScope(ast, oldName, newName) {
  babel.traverse(ast, {
    Scope(path) {
      if (path.scope.hasBinding(oldName)) {
        path.scope.rename(oldName, newName);
      }
    }
  });
}

/**
 * Remove statements matching a given node type.
 * @param {object} ast - The AST root node.
 * @param {string} nodeType - AST node type to remove (e.g., 'DebuggerStatement').
 */
function removeNodesByType(ast, nodeType) {
  babel.traverse(ast, {
    [nodeType](path) {
      path.remove();
    }
  });
}

/**
 * Fast check whether AST contains a specific node type without full traversal.
 * @param {object} ast - The AST root node.
 * @param {string} nodeType - AST node type name.
 * @returns {boolean} True if found.
 */
function hasNodeType(ast, nodeType) {
  return babel.traverse.hasType(ast, nodeType);
}

/**
 * Explode a visitor object to normalize pipe syntax and enter/exit arrays.
 * @param {object} visitor - Raw visitor object.
 * @returns {object} Exploded visitor object.
 */
function explodeVisitor(visitor) {
  return babel.traverse.explode(visitor);
}

module.exports = {
  babel,
  traverse: babel.traverse,
  types: babel.types,
  traverseAst,
  parseCode,
  collectIdentifiers,
  renameBindingInScope,
  removeNodesByType,
  hasNodeType,
  explodeVisitor
};

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const {
  babel,
  traverse,
  types,
  traverseAst,
  parseCode,
  collectIdentifiers,
  renameBindingInScope,
  removeNodesByType,
  hasNodeType,
  explodeVisitor
} = require('../src/index.js');

// 1. assert babel.traverse is exported as a function with helper utilities (explode, hasType, clearNode)
{
  assert.equal(typeof traverse, 'function', 'traverse should be a function');
  assert.equal(typeof traverse.explode, 'function', 'traverse.explode should be a function');
  assert.equal(typeof traverse.hasType, 'function', 'traverse.hasType should be a function');
  assert.equal(typeof traverse.clearNode, 'function', 'traverse.clearNode should be a function');
}

// 2. assert traverse walks AST nodes and triggers visitor callbacks for specific node types such as Identifier
{
  const ast = parseCode('function multiply(factorA, factorB) { return factorA * factorB; }');
  const names = collectIdentifiers(ast);
  assert.deepEqual(names, ['multiply', 'factorA', 'factorB', 'factorA', 'factorB']);
}

// 3. assert traverse executes enter and exit lifecycle hooks in correct order for AST nodes
{
  const ast = parseCode('function processItem() { return 42; }');
  const lifecycleEvents = [];
  traverseAst(ast, {
    FunctionDeclaration: {
      enter(path) {
        lifecycleEvents.push(`enter:${path.node.id.name}`);
      },
      exit(path) {
        lifecycleEvents.push(`exit:${path.node.id.name}`);
      }
    },
    ReturnStatement(path) {
      lifecycleEvents.push(`return:${path.node.argument.value}`);
    }
  });
  assert.deepEqual(lifecycleEvents, ['enter:processItem', 'return:42', 'exit:processItem']);
}

// 4. assert traverse supports path.scope binding inspection and scope-level symbol renaming
{
  const ast = parseCode('function compute(inputVal) { const temp = inputVal * 2; return temp; }');
  let hasInput = false;
  traverseAst(ast, {
    FunctionDeclaration(path) {
      hasInput = path.scope.hasBinding('inputVal');
      assert.equal(path.scope.hasBinding('temp'), true);
      assert.equal(path.scope.hasBinding('nonExistent'), false);
    }
  });
  assert.equal(hasInput, true);

  renameBindingInScope(ast, 'inputVal', 'normalizedVal');
  const transformedCode = babel.transformFromAstSync(ast).code;
  assert(transformedCode.includes('function compute(normalizedVal)'));
  assert(transformedCode.includes('const temp = normalizedVal * 2;'));
}

// 5. assert traverse supports path.skip to bypass child node traversal and path.stop to halt traversal
{
  const ast = parseCode('function root() { function nested() { return 1; } } function sibling() {}');
  const visitedFns = [];
  traverseAst(ast, {
    FunctionDeclaration(path) {
      visitedFns.push(path.node.id.name);
      if (path.node.id.name === 'root') {
        path.skip();
      }
    }
  });
  assert.deepEqual(visitedFns, ['root', 'sibling']);

  const stoppedFns = [];
  traverseAst(ast, {
    FunctionDeclaration(path) {
      stoppedFns.push(path.node.id.name);
      if (path.node.id.name === 'root') {
        path.stop();
      }
    }
  });
  assert.deepEqual(stoppedFns, ['root']);
}

// 6. assert traverse passes custom visitor state and context objects across AST nodes
{
  const ast = parseCode('const alpha = 1; let beta = 2; var gamma = 3;');
  const customState = { declarationsCount: 0, variableKinds: [] };
  traverseAst(ast, {
    VariableDeclaration(path, state) {
      state.declarationsCount++;
      state.variableKinds.push(path.node.kind);
    }
  }, null, customState);
  assert.equal(customState.declarationsCount, 3);
  assert.deepEqual(customState.variableKinds, ['const', 'let', 'var']);
}

// 7. assert traverse supports AST mutation with path.remove and path.replaceWith
{
  const ast = parseCode('console.log("start"); debugger; const count = 10;');
  removeNodesByType(ast, 'DebuggerStatement');
  traverseAst(ast, {
    NumericLiteral(path) {
      if (path.node.value === 10) {
        path.replaceWith(types.numericLiteral(20));
      }
    }
  });
  const outputCode = babel.transformFromAstSync(ast).code;
  assert(!outputCode.includes('debugger'), 'debugger statement should be removed');
  assert(outputCode.includes('const count = 20;'), 'count value should be replaced with 20');
}

// 8. assert traverse.hasType quickly detects existence of AST node types without full traversal
{
  const classAst = parseCode('class ServiceHandler { handle() {} }');
  assert.equal(hasNodeType(classAst, 'ClassDeclaration'), true);
  assert.equal(hasNodeType(classAst, 'ClassMethod'), true);
  assert.equal(hasNodeType(classAst, 'ForInStatement'), false);
}

// 9. assert traverse.explode normalizes multi-key and pipe-separated visitor descriptors
{
  const exploded = explodeVisitor({
    'FunctionDeclaration|VariableDeclaration'(path) {}
  });
  assert.equal(exploded._exploded, true);
  assert(Array.isArray(exploded.FunctionDeclaration.enter));
  assert.equal(typeof exploded.FunctionDeclaration.enter[0], 'function');
  assert(Array.isArray(exploded.VariableDeclaration.enter));
  assert.equal(typeof exploded.VariableDeclaration.enter[0], 'function');
}

console.log('Contract tests passed successfully.');