typescript 7.0.2: isIdentifier

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 typescript.isIdentifier in pkg:npm/typescript@7.0.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/typescript@7.0.2
Demonstrate these symbols/APIs:
  - typescript.isIdentifier

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-typescript-is-identifier",
  "version": "1.0.0",
  "description": "Construct and validate TypeScript AST identifier nodes using isIdentifier",
  "type": "module",
  "main": "src/index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "typescript": "7.0.2"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify typescript.isIdentifier in pkg:npm/typescript@7.0.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/typescript@7.0.2"
  ],
  "symbols": [
    "typescript.isIdentifier"
  ]
}

import {
  createIdentifier,
  createStringLiteral,
  createNumericLiteral
} from 'typescript/unstable/ast/factory';

import {
  isIdentifier,
  SyntaxKind
} from 'typescript/unstable/ast';

/**
 * Validates that an AST node is a TypeScript Identifier node and returns its text.
 *
 * @param {object} node - AST node to check.
 * @returns {string} The text content of the identifier.
 * @throws {TypeError} If node is missing or not an Identifier AST node.
 */
export function validateIdentifier(node) {
  if (!node || typeof node !== 'object') {
    throw new TypeError('Expected an AST node object');
  }
  if (!isIdentifier(node)) {
    throw new TypeError('Expected a TypeScript Identifier AST node');
  }
  return node.text;
}

/**
 * Creates a validated TypeScript Identifier AST node with the given name.
 *
 * @param {string} name - Identifier name.
 * @returns {object} The created Identifier AST node.
 * @throws {TypeError} If name is not a non-empty string.
 */
export function createSafeIdentifier(name) {
  if (typeof name !== 'string' || name.trim().length === 0) {
    throw new TypeError('Identifier name must be a non-empty string');
  }
  const idNode = createIdentifier(name);
  if (!isIdentifier(idNode)) {
    throw new Error('Failed to construct a valid Identifier AST node');
  }
  return idNode;
}

/**
 * Filters an array of AST nodes and returns only those that are valid Identifier nodes.
 *
 * @param {object[]} nodes - Array of candidate AST nodes.
 * @returns {object[]} Array of validated Identifier AST nodes.
 */
export function filterIdentifiers(nodes) {
  if (!Array.isArray(nodes)) {
    return [];
  }
  return nodes.filter(node => node && typeof node === 'object' && isIdentifier(node));
}

/**
 * Checks whether a value is a valid TypeScript AST Identifier node without throwing.
 *
 * @param {unknown} node - Candidate value to test.
 * @returns {boolean} True if value is an Identifier AST node, false otherwise.
 */
export function isIdentifierNode(node) {
  if (!node || typeof node !== 'object') {
    return false;
  }
  return isIdentifier(node);
}

export {
  isIdentifier,
  createIdentifier,
  createStringLiteral,
  createNumericLiteral,
  SyntaxKind
};

import assert from 'node:assert/strict';
import {
  createIdentifier,
  createStringLiteral,
  createNumericLiteral,
  createExpressionWithTypeArguments
} from 'typescript/unstable/ast/factory';

import {
  isIdentifier,
  validateIdentifier,
  createSafeIdentifier,
  filterIdentifiers,
  isIdentifierNode,
  SyntaxKind
} from '../src/index.mjs';

// Contract 1: isIdentifier returns true for AST Identifier nodes constructed with createIdentifier
{
  const idNode = createIdentifier('userName');
  assert.strictEqual(isIdentifier(idNode), true, 'createIdentifier output must satisfy isIdentifier');
  assert.strictEqual(idNode.kind, SyntaxKind.Identifier, 'kind must match SyntaxKind.Identifier');
  assert.strictEqual(idNode.text, 'userName', 'text property should match identifier name');
  assert.strictEqual(isIdentifierNode(idNode), true, 'isIdentifierNode helper should return true');
}

// Contract 2: isIdentifier returns false for other AST node types such as string and numeric literals
{
  const strLiteral = createStringLiteral('userName');
  assert.strictEqual(isIdentifier(strLiteral), false, 'StringLiteral must not satisfy isIdentifier');
  assert.notStrictEqual(strLiteral.kind, SyntaxKind.Identifier, 'StringLiteral kind must not be SyntaxKind.Identifier');

  const numLiteral = createNumericLiteral('123');
  assert.strictEqual(isIdentifier(numLiteral), false, 'NumericLiteral must not satisfy isIdentifier');

  const typeExpr = createExpressionWithTypeArguments(createIdentifier('MyType'), []);
  assert.strictEqual(isIdentifier(typeExpr), false, 'ExpressionWithTypeArguments must not satisfy isIdentifier');
}

// Contract 3: isIdentifier throws TypeError when evaluated on null or undefined
{
  assert.throws(
    () => isIdentifier(null),
    {
      name: 'TypeError'
    },
    'isIdentifier on null should throw TypeError'
  );

  assert.throws(
    () => isIdentifier(undefined),
    {
      name: 'TypeError'
    },
    'isIdentifier on undefined should throw TypeError'
  );

  assert.strictEqual(isIdentifierNode(null), false, 'Safe wrapper isIdentifierNode should return false for null');
  assert.strictEqual(isIdentifierNode(undefined), false, 'Safe wrapper isIdentifierNode should return false for undefined');
  assert.strictEqual(isIdentifierNode({}), false, 'Safe wrapper isIdentifierNode should return false for empty object');
}

// Contract 4: filterIdentifiers filters mixed AST node collections to only valid Identifier nodes
{
  const id1 = createIdentifier('alpha');
  const id2 = createIdentifier('beta');
  const str = createStringLiteral('gamma');
  const num = createNumericLiteral('42');
  const nonNode = { type: 'custom' };

  const mixedList = [id1, str, null, id2, num, undefined, nonNode];
  const filtered = filterIdentifiers(mixedList);

  assert.strictEqual(filtered.length, 2, 'Filtered array should contain exactly 2 identifiers');
  assert.strictEqual(filtered[0], id1, 'First filtered item should be id1');
  assert.strictEqual(filtered[1], id2, 'Second filtered item should be id2');
  assert.deepStrictEqual(filterIdentifiers(null), [], 'Null input should return empty array');
  assert.deepStrictEqual(filterIdentifiers(undefined), [], 'Undefined input should return empty array');
}

// Contract 5: validateIdentifier returns identifier text for valid identifiers and throws TypeError for invalid nodes
{
  const id = createSafeIdentifier('validVarName');
  assert.strictEqual(isIdentifier(id), true, 'createSafeIdentifier result must satisfy isIdentifier');
  assert.strictEqual(validateIdentifier(id), 'validVarName', 'validateIdentifier should return identifier text');

  const str = createStringLiteral('notAnId');
  assert.throws(
    () => validateIdentifier(str),
    {
      name: 'TypeError',
      message: 'Expected a TypeScript Identifier AST node'
    }
  );

  assert.throws(
    () => validateIdentifier(null),
    {
      name: 'TypeError',
      message: 'Expected an AST node object'
    }
  );

  assert.throws(
    () => createSafeIdentifier(''),
    {
      name: 'TypeError',
      message: 'Identifier name must be a non-empty string'
    }
  );
}

console.log('Contract test passed successfully.');