@babel/types 7.29.7: assertCallExpression

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.assertCallExpression 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.assertCallExpression

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-assert-call-expression",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-babel-types-assert-call-expression",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@babel/types": "7.29.7"
      }
    },
    "node_modules/@babel/helper-string-parser": {
      "version": "7.29.7",
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      "license": "MIT",
      "engines": {
        "node": ">=6.9.0"
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    },
    "node_modules/@babel/helper-validator-identifier": {
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      "license": "MIT",
      "engines": {
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    "node_modules/@babel/types": {
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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-call-expression",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of @babel/types.assertCallExpression",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "@babel/types": "7.29.7"
  }
}

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

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

/**
 * Creates an AST CallExpression node.
 * @param {object} callee
 * @param {Array} [args]
 * @returns {object}
 */
function createCallExpression(callee, args = []) {
  return t.callExpression(callee, args);
}

/**
 * Asserts that a node is a CallExpression, optionally validating opts.
 * @param {object} node
 * @param {object} [opts]
 */
function assertCallExpressionNode(node, opts) {
  t.assertCallExpression(node, opts);
}

/**
 * Checks whether a node is a CallExpression.
 * @param {object} node
 * @param {object} [opts]
 * @returns {boolean}
 */
function isCallExpressionNode(node, opts) {
  return t.isCallExpression(node, opts);
}

module.exports = {
  t,
  createCallExpression,
  assertCallExpressionNode,
  isCallExpressionNode,
};

import assert from 'node:assert';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const {
  t,
  createCallExpression,
  assertCallExpressionNode,
  isCallExpressionNode,
} = require('../src/index.js');

async function runContract() {
  const callee = t.identifier('greet');
  const arg1 = t.stringLiteral('world');
  const callNode = createCallExpression(callee, [arg1]);
  const identifierNode = t.identifier('notACall');

  // 1. @babel/types.assertCallExpression does not throw on a valid CallExpression AST node
  assert.strictEqual(callNode.type, 'CallExpression');
  t.assertCallExpression(callNode);
  assertCallExpressionNode(callNode);
  assert.strictEqual(isCallExpressionNode(callNode), true);

  // 2. @babel/types.assertCallExpression does not throw when opts match node properties
  t.assertCallExpression(callNode, { callee });
  assertCallExpressionNode(callNode, { callee });

  // 3. @babel/types.assertCallExpression throws an error when input node is not a CallExpression
  assert.throws(
    () => t.assertCallExpression(identifierNode),
    (err) => err instanceof Error && /Expected type "CallExpression"/.test(err.message),
    'assertCallExpression on Identifier node must throw'
  );
  assert.throws(
    () => assertCallExpressionNode(identifierNode),
    (err) => err instanceof Error && /Expected type "CallExpression"/.test(err.message),
    'assertCallExpressionNode on Identifier node must throw'
  );

  // 4. @babel/types.assertCallExpression throws an error when opts do not match node properties
  const wrongCallee = t.identifier('otherFunc');
  assert.throws(
    () => t.assertCallExpression(callNode, { callee: wrongCallee }),
    (err) => err instanceof Error && /Expected type "CallExpression"/.test(err.message),
    'assertCallExpression with mismatching opts must throw'
  );
  assert.throws(
    () => assertCallExpressionNode(callNode, { callee: wrongCallee }),
    (err) => err instanceof Error && /Expected type "CallExpression"/.test(err.message),
    'assertCallExpressionNode with mismatching opts must throw'
  );

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

runContract().catch((err) => {
  console.error('Contract failed:', err);
  process.exit(1);
});