@babel/types 7.29.8: isNodesEquivalent

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/types.isNodesEquivalent in pkg:npm/%40babel/types@7.29.8
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/types@7.29.8
Demonstrate these symbols/APIs:
  - @babel/types.isNodesEquivalent
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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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    "node_modules/@babel/helper-validator-identifier": {
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      "license": "MIT",
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        "@babel/helper-validator-identifier": "^7.29.7"
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      "engines": {
        "node": ">=6.9.0"
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  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/types": "7.29.8"
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}

{
  "schemaVersion": 1,
  "goal": "verify @babel/types.isNodesEquivalent in pkg:npm/%40babel/types@7.29.8",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/types@7.29.8"
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    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
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  }
}

import * as t from "@babel/types";

export function areNodesEquivalent(nodeA, nodeB) {
  return t.isNodesEquivalent(nodeA, nodeB);
}

export function compareExpressions(exprA, exprB) {
  return t.isNodesEquivalent(exprA, exprB);
}

export function areNodesEquivalentIgnoringLoc(nodeA, nodeB) {
  return t.isNodesEquivalent(nodeA, nodeB);
}

import assert from "node:assert/strict";
import * as t from "@babel/types";
import {
  areNodesEquivalent,
  compareExpressions,
  areNodesEquivalentIgnoringLoc
} from "../src/index.mjs";

// Test 1: isNodesEquivalent returns true for structurally identical AST nodes with matching types and values
{
  const id1 = t.identifier("variableName");
  const id2 = t.identifier("variableName");
  assert.equal(areNodesEquivalent(id1, id2), true);

  const num1 = t.numericLiteral(12345);
  const num2 = t.numericLiteral(12345);
  assert.equal(areNodesEquivalent(num1, num2), true);

  const str1 = t.stringLiteral("hello world");
  const str2 = t.stringLiteral("hello world");
  assert.equal(areNodesEquivalent(str1, str2), true);
}

// Test 2: isNodesEquivalent returns true for structurally equivalent AST nodes with different location metadata
{
  const node1 = t.identifier("foo");
  node1.loc = { start: { line: 1, column: 0 }, end: { line: 1, column: 3 } };
  node1.start = 0;
  node1.end = 3;

  const node2 = t.identifier("foo");
  node2.loc = { start: { line: 50, column: 10 }, end: { line: 50, column: 13 } };
  node2.start = 500;
  node2.end = 503;

  assert.equal(areNodesEquivalentIgnoringLoc(node1, node2), true);
}

// Test 3: isNodesEquivalent returns false for AST nodes with different types or differing property values
{
  const id1 = t.identifier("alpha");
  const id2 = t.identifier("beta");
  assert.equal(areNodesEquivalent(id1, id2), false);

  const num = t.numericLiteral(42);
  const str = t.stringLiteral("42");
  assert.equal(areNodesEquivalent(num, str), false);

  const binPlus = t.binaryExpression("+", t.identifier("a"), t.numericLiteral(1));
  const binMinus = t.binaryExpression("-", t.identifier("a"), t.numericLiteral(1));
  assert.equal(compareExpressions(binPlus, binMinus), false);
}

// Test 4: isNodesEquivalent recursively compares complex nested AST structures such as binary expressions and call expressions
{
  const nestedExpr1 = t.binaryExpression(
    "*",
    t.binaryExpression("+", t.identifier("x"), t.numericLiteral(2)),
    t.callExpression(t.identifier("getValue"), [t.stringLiteral("param")])
  );

  const nestedExpr2 = t.binaryExpression(
    "*",
    t.binaryExpression("+", t.identifier("x"), t.numericLiteral(2)),
    t.callExpression(t.identifier("getValue"), [t.stringLiteral("param")])
  );

  const nestedExpr3 = t.binaryExpression(
    "*",
    t.binaryExpression("+", t.identifier("x"), t.numericLiteral(3)),
    t.callExpression(t.identifier("getValue"), [t.stringLiteral("param")])
  );

  assert.equal(compareExpressions(nestedExpr1, nestedExpr2), true);
  assert.equal(compareExpressions(nestedExpr1, nestedExpr3), false);
}

console.log("All @babel/types.isNodesEquivalent contract tests passed successfully.");