@babel/types 7.29.8: isBinaryExpression

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.isBinaryExpression 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.isBinaryExpression
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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  "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.isBinaryExpression in pkg:npm/%40babel/types@7.29.8",
  "kind": "HOW",
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import * as t from "@babel/types";

export function checkIsBinaryExpression(node) {
  return t.isBinaryExpression(node);
}

export function checkIsBinaryExpressionWithOperator(node, operator) {
  return t.isBinaryExpression(node, { operator });
}

export function checkIsBinaryExpressionWithOptions(node, opts) {
  return t.isBinaryExpression(node, opts);
}

export function createBinaryExpression(operator, left, right) {
  return t.binaryExpression(operator, left, right);
}

import assert from "node:assert/strict";
import * as t from "@babel/types";
import {
  checkIsBinaryExpression,
  checkIsBinaryExpressionWithOperator,
  checkIsBinaryExpressionWithOptions,
  createBinaryExpression
} from "../src/index.mjs";

// Test 1: isBinaryExpression returns true for valid BinaryExpression AST nodes
{
  const binNode = createBinaryExpression(
    "+",
    t.identifier("x"),
    t.numericLiteral(42)
  );
  assert.equal(checkIsBinaryExpression(binNode), true);
  assert.equal(t.isBinaryExpression(binNode), true);
}

// Test 2: isBinaryExpression returns false for non-BinaryExpression AST nodes, primitives, and nullish values
{
  const idNode = t.identifier("x");
  const litNode = t.numericLiteral(100);
  const logicalNode = t.logicalExpression("&&", t.identifier("a"), t.identifier("b"));
  const unaryNode = t.unaryExpression("!", t.identifier("flag"));

  assert.equal(checkIsBinaryExpression(idNode), false);
  assert.equal(checkIsBinaryExpression(litNode), false);
  assert.equal(checkIsBinaryExpression(logicalNode), false);
  assert.equal(checkIsBinaryExpression(unaryNode), false);
  assert.equal(checkIsBinaryExpression(null), false);
  assert.equal(checkIsBinaryExpression(undefined), false);
  assert.equal(checkIsBinaryExpression("not-a-node"), false);
  assert.equal(checkIsBinaryExpression(123), false);
  assert.equal(checkIsBinaryExpression({}), false);
}

// Test 3: isBinaryExpression supports property filtering via match options
{
  const plusNode = createBinaryExpression(
    "+",
    t.identifier("a"),
    t.identifier("b")
  );

  assert.equal(checkIsBinaryExpressionWithOperator(plusNode, "+"), true);
  assert.equal(checkIsBinaryExpressionWithOperator(plusNode, "-"), false);
  assert.equal(checkIsBinaryExpressionWithOptions(plusNode, { operator: "+" }), true);
  assert.equal(checkIsBinaryExpressionWithOptions(plusNode, { operator: "*" }), false);
}

// Test 4: isBinaryExpression distinguishes binary expressions from logical and unary expressions
{
  const binNode = t.binaryExpression("===", t.identifier("left"), t.identifier("right"));
  const logNode = t.logicalExpression("||", t.identifier("left"), t.identifier("right"));
  const unNode = t.unaryExpression("typeof", t.identifier("left"));

  assert.equal(t.isBinaryExpression(binNode), true);
  assert.equal(t.isBinaryExpression(logNode), false);
  assert.equal(t.isBinaryExpression(unNode), false);
  assert.equal(t.isLogicalExpression(logNode), true);
  assert.equal(t.isUnaryExpression(unNode), true);
}

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