CodeSampleX

Sample

@babel/core 7.29.7: traverse

Verified sample for npm @babel/core 7.29.7: traverse. The contract ran on node 22 · linux alpine/x64 · docker and passed: assert babel.traverse is exported…

sha256:e48e41b661e86eae79a790b3c01092be05d06510dd011fa94df864098b0d7cde

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
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…		 2026-08-23

Case

HOW
Goal
verify @babel/core.traverse in pkg:npm/%40babel/core@7.29.7
Packages
Symbols
  • @babel/core.traverse
Created
2026-08-23T06:35:21Z

Contract

  1. assert babel.traverse is exported as a function with helper utilities (explode, hasType, clearNode)
  2. assert traverse walks AST nodes and triggers visitor callbacks for specific node types such as Identifier
  3. assert traverse executes enter and exit lifecycle hooks in correct order for AST nodes
  4. assert traverse supports path.scope binding inspection and scope-level symbol renaming
  5. assert traverse supports path.skip to bypass child node traversal and path.stop to halt traversal
  6. assert traverse passes custom visitor state and context objects across AST nodes
  7. assert traverse supports AST mutation with path.remove and path.replaceWith
  8. assert traverse.hasType quickly detects existence of AST node types without full traversal
  9. assert traverse.explode normalizes multi-key and pipe-separated visitor descriptors

Files

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

Download the source artifact (tar.gz)

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 @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.
csx.json
{"case":{"caseId":"case:sha256:a98db5bd30392bb5aaff20aa94f9fae65667fd342ec5a926f4d338ecfae530c2","contract":["assert babel.traverse is exported as a function with helper utilities (explode, hasType, clearNode)","assert traverse walks AST nodes and triggers visitor callbacks for specific node types such as Identifier","assert traverse executes enter and exit lifecycle hooks in correct order for AST nodes","assert traverse supports path.scope binding inspection and scope-level symbol renaming","assert traverse supports path.skip to bypass child node traversal and path.stop to halt traversal","assert traverse passes custom visitor state and context objects across AST nodes","assert traverse supports AST mutation with path.remove and path.replaceWith","assert traverse.hasType quickly detects existence of AST node types without full traversal","assert traverse.explode normalizes multi-key and pipe-separated visitor descriptors"],"goal":"verify @babel/core.traverse in pkg:npm/%40babel/core@7.29.7","kind":"HOW","packages":["pkg:npm/%40babel/core@7.29.7"],"schemaVersion":1,"symbols":["@babel/core.traverse"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/core@7.29.7"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.29.7","symbols":["@babel/core.traverse"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "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"
}
spec.json
{
  "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"
  ]
}
src/index.js
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
};
test/contract.mjs
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.');

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