@babel/types 7.29.8: assertBinaryExpression

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.assertBinaryExpression 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.assertBinaryExpression
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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const t = require('@babel/types');

function validateBinaryExpression(node, opts) {
  t.assertBinaryExpression(node, opts);
  return true;
}

module.exports = {
  validateBinaryExpression,
};

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  "version": "1.0.0",
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    "node_modules/@babel/helper-string-parser": {
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      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.29.7.tgz",
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      "license": "MIT",
      "engines": {
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    "node_modules/@babel/helper-validator-identifier": {
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      "license": "MIT",
      "dependencies": {
        "@babel/helper-string-parser": "^7.29.7",
        "@babel/helper-validator-identifier": "^7.29.7"
      },
      "engines": {
        "node": ">=6.9.0"
      }
    }
  }
}

{
  "name": "sample-babel-types-assert-binary-expression",
  "version": "1.0.0",
  "private": true,
  "description": "Sample verifying @babel/types.assertBinaryExpression",
  "main": "index.js",
  "scripts": {
    "test": "node test/contract.cjs"
  },
  "dependencies": {
    "@babel/types": "7.29.8"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/types.assertBinaryExpression 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",
    "runtime": "node@22.23.2"
  }
}

const assert = require('node:assert');
const t = require('@babel/types');
const { validateBinaryExpression } = require('../index.js');

// 1. Setup sample AST nodes
const left = t.numericLiteral(10);
const right = t.numericLiteral(20);
const binaryNode = t.binaryExpression('+', left, right);
const identifierNode = t.identifier('foo');

// 2. Test assertBinaryExpression directly on valid BinaryExpression
t.assertBinaryExpression(binaryNode);
assert.strictEqual(validateBinaryExpression(binaryNode), true);

// 3. Test assertBinaryExpression with matching options
t.assertBinaryExpression(binaryNode, { operator: '+' });
assert.strictEqual(validateBinaryExpression(binaryNode, { operator: '+' }), true);

// 4. Test assertBinaryExpression throws on non-BinaryExpression node
assert.throws(() => {
  t.assertBinaryExpression(identifierNode);
}, (err) => {
  return err instanceof Error && /Expected type "BinaryExpression"/.test(err.message);
});

assert.throws(() => {
  validateBinaryExpression(identifierNode);
}, (err) => {
  return err instanceof Error && /Expected type "BinaryExpression"/.test(err.message);
});

// 5. Test assertBinaryExpression throws on null/undefined
assert.throws(() => {
  t.assertBinaryExpression(null);
}, (err) => {
  return err instanceof Error;
});

// 6. Test assertBinaryExpression throws when options do not match
assert.throws(() => {
  t.assertBinaryExpression(binaryNode, { operator: '-' });
}, (err) => {
  return err instanceof Error && /Expected type "BinaryExpression"/.test(err.message);
});

assert.throws(() => {
  validateBinaryExpression(binaryNode, { operator: '-' });
}, (err) => {
  return err instanceof Error && /Expected type "BinaryExpression"/.test(err.message);
});

console.log('Contract passed: @babel/types.assertBinaryExpression behavior verified successfully.');