@babel/types 7.29.7: isCallExpression

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.isCallExpression in pkg:npm/%40babel/types@7.29.7
Kind: HOW

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

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-types-is-call-expression",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/types": "7.29.7"
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}

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

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

export function createCallExpression(callee, args) {
  return t.callExpression(callee, args);
}

export function checkIsCallExpression(node, opts) {
  return t.isCallExpression(node, opts);
}

export function assertIsCallExpression(node, opts) {
  t.assertCallExpression(node, opts);
}

import assert from "node:assert/strict";
import * as t from "@babel/types";
import {
  createCallExpression,
  checkIsCallExpression,
  assertIsCallExpression
} from "../src/index.mjs";

// Test 1: isCallExpression returns true for CallExpression AST nodes
{
  const callee = t.identifier("myFunction");
  const args = [t.stringLiteral("arg1"), t.numericLiteral(42)];
  const callNode = createCallExpression(callee, args);

  assert.equal(callNode.type, "CallExpression");
  assert.equal(checkIsCallExpression(callNode), true);
  assert.equal(t.isCallExpression(callNode), true);
}

// Test 2: isCallExpression returns false for non-CallExpression AST nodes, primitives, and nullish values
{
  const identifierNode = t.identifier("myFunction");
  const stringNode = t.stringLiteral("arg1");
  const memberNode = t.memberExpression(t.identifier("console"), t.identifier("log"));
  const optCallNode = t.optionalCallExpression(identifierNode, [], true);

  assert.equal(checkIsCallExpression(identifierNode), false);
  assert.equal(checkIsCallExpression(stringNode), false);
  assert.equal(checkIsCallExpression(memberNode), false);
  assert.equal(checkIsCallExpression(optCallNode), false);
  assert.equal(checkIsCallExpression(null), false);
  assert.equal(checkIsCallExpression(undefined), false);
  assert.equal(checkIsCallExpression("not an ast node"), false);
  assert.equal(checkIsCallExpression(12345), false);
  assert.equal(checkIsCallExpression({}), false);
}

// Test 3: isCallExpression supports match options to refine matching against node properties
{
  const calleeA = t.identifier("foo");
  const calleeB = t.identifier("bar");
  const callNode = createCallExpression(calleeA, []);

  assert.equal(checkIsCallExpression(callNode, { callee: calleeA }), true);
  assert.equal(checkIsCallExpression(callNode, { callee: calleeB }), false);
}

// Test 4: assertCallExpression succeeds on valid CallExpression nodes and throws on mismatched node types
{
  const callee = t.identifier("testFunc");
  const callNode = createCallExpression(callee, []);
  const otherNode = t.identifier("notACall");

  assert.doesNotThrow(() => {
    assertIsCallExpression(callNode);
  });

  assert.doesNotThrow(() => {
    assertIsCallExpression(callNode, { callee });
  });

  assert.throws(() => {
    assertIsCallExpression(otherNode);
  });

  assert.throws(() => {
    assertIsCallExpression(callNode, { callee: t.identifier("mismatched") });
  });

  assert.throws(() => {
    assertIsCallExpression(null);
  });
}

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