@babel/types 7.29.8: assertIdentifier

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.assertIdentifier 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.assertIdentifier
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.

{"case":{"caseId":"case:sha256:609b86a547c2684da2a1592c363f31b1a63461d01e7157712efc75736b863e10","constraints":{"executionContext":"node"},"contract":["assertIdentifier succeeds without throwing when provided a valid Identifier AST node","assertIdentifier validates node properties matching expected attributes such as name and throws on property mismatch","assertIdentifier throws an error when called with non-Identifier AST node types","assertIdentifier throws an error when called with null, undefined, or invalid object inputs"],"goal":"verify @babel/types.assertIdentifier in pkg:npm/%40babel/types@7.29.8","kind":"HOW","packages":["pkg:npm/%40babel/types@7.29.8"],"schemaVersion":1,"symbols":["@babel/types.assertIdentifier"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/types@7.29.8"],"schemaVersion":1,"subject":"pkg:npm/%40babel/types@7.29.8","symbols":["@babel/types.assertIdentifier"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-babel-types-assert-identifier",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-babel-types-assert-identifier",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@babel/types": "7.29.8"
      }
    },
    "node_modules/@babel/helper-string-parser": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-7.29.7.tgz",
      "integrity": "sha512-Pb5ijPrZ89GDH8223L4UP8i6QApWxs04RbPQJTeWDV0/keR2E36MeKnyr6LYmUUvqRRI+Iv87SuF1W6ErINzYw==",
      "license": "MIT",
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@babel/helper-validator-identifier": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.29.7.tgz",
      "integrity": "sha512-qehxGkRj55h/ff8EMaJ+cYhyaKlHIxqYDn682wQD7RNp9UujOQsHog2uS0r2vzr4pW+sXf90NeeayjcNaX3fFg==",
      "license": "MIT",
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@babel/types": {
      "version": "7.29.8",
      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.29.8.tgz",
      "integrity": "sha512-Vj1jF3cPfxg7OAfoI7QnVKLoILlm2JF9pnVHrX8qx7AHMiYWT+NDAA7jChlNgRS4WTLc/fD1lXLmPixluj+3Gg==",
      "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-identifier",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/types": "7.29.8"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/types.assertIdentifier in pkg:npm/%40babel/types@7.29.8",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/types@7.29.8"
  ],
  "symbols": [
    "@babel/types.assertIdentifier"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

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

export function createIdentifier(name) {
  return t.identifier(name);
}

export function validateIdentifier(node, opts) {
  t.assertIdentifier(node, opts);
  return true;
}

export function ensureIdentifierWithName(node, expectedName) {
  t.assertIdentifier(node, { name: expectedName });
  return node.name;
}

export function isValidIdentifier(node) {
  return t.isIdentifier(node);
}

import assert from "node:assert/strict";
import * as t from "@babel/types";
import {
  createIdentifier,
  validateIdentifier,
  ensureIdentifierWithName,
  isValidIdentifier
} from "../src/index.mjs";

// Test 1: assertIdentifier succeeds without throwing on valid Identifier AST node
{
  const idNode = createIdentifier("myVariable");
  assert.equal(idNode.type, "Identifier");
  assert.equal(idNode.name, "myVariable");

  assert.doesNotThrow(() => {
    t.assertIdentifier(idNode);
  });
  assert.equal(validateIdentifier(idNode), true);
}

// Test 2: assertIdentifier validates node properties matching expected attributes such as name
{
  const idNode = createIdentifier("totalCount");

  assert.doesNotThrow(() => {
    t.assertIdentifier(idNode, { name: "totalCount" });
  });
  assert.equal(ensureIdentifierWithName(idNode, "totalCount"), "totalCount");

  assert.throws(() => {
    t.assertIdentifier(idNode, { name: "differentName" });
  });
}

// Test 3: assertIdentifier throws an error when called with non-Identifier AST nodes
{
  const numNode = t.numericLiteral(42);
  const strNode = t.stringLiteral("hello");
  const binNode = t.binaryExpression("+", t.identifier("a"), t.identifier("b"));

  assert.equal(isValidIdentifier(numNode), false);
  assert.equal(isValidIdentifier(strNode), false);
  assert.equal(isValidIdentifier(binNode), false);

  assert.throws(() => {
    t.assertIdentifier(numNode);
  });

  assert.throws(() => {
    t.assertIdentifier(strNode);
  });

  assert.throws(() => {
    t.assertIdentifier(binNode);
  });
}

// Test 4: assertIdentifier throws an error when called with null, undefined, or invalid object inputs
{
  assert.throws(() => {
    t.assertIdentifier(null);
  });

  assert.throws(() => {
    t.assertIdentifier(undefined);
  });

  assert.throws(() => {
    t.assertIdentifier({});
  });

  assert.throws(() => {
    t.assertIdentifier({ type: "InvalidType" });
  });
}

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