typescript 7.0.2: createKeywordTypeNode

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.createKeywordTypeNode 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.createKeywordTypeNode

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": "typescript-keyword-type-node-sample",
  "version": "1.0.0",
  "description": "Construct and validate TypeScript keyword type nodes using createKeywordTypeNode",
  "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.createKeywordTypeNode in pkg:npm/typescript@7.0.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/typescript@7.0.2"
  ],
  "symbols": [
    "typescript.createKeywordTypeNode"
  ]
}

import {
  createKeywordTypeNode,
} from 'typescript/unstable/ast/factory';

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

const KEYWORD_MAP = {
  string: SyntaxKind.StringKeyword,
  number: SyntaxKind.NumberKeyword,
  boolean: SyntaxKind.BooleanKeyword,
  void: SyntaxKind.VoidKeyword,
  any: SyntaxKind.AnyKeyword,
  unknown: SyntaxKind.UnknownKeyword,
  never: SyntaxKind.NeverKeyword,
  undefined: SyntaxKind.UndefinedKeyword,
  symbol: SyntaxKind.SymbolKeyword,
  bigint: SyntaxKind.BigIntKeyword,
  object: SyntaxKind.ObjectKeyword,
};

/**
 * Creates a KeywordTypeNode AST node from a keyword name string or SyntaxKind.
 *
 * @param {string | number} keyword - Keyword name or SyntaxKind enum value.
 * @returns {object} KeywordTypeNode AST node.
 */
export function createKeywordType(keyword) {
  if (typeof keyword === 'number') {
    return createKeywordTypeNode(keyword);
  }
  if (typeof keyword === 'string') {
    const kind = KEYWORD_MAP[keyword.toLowerCase()];
    if (kind !== undefined) {
      return createKeywordTypeNode(kind);
    }
    throw new Error(`Unknown keyword type name: ${keyword}`);
  }
  throw new TypeError('Expected keyword to be a string name or SyntaxKind number');
}

/**
 * Validates whether an AST node is a KeywordTypeNode, optionally checking expected kind.
 *
 * @param {object} node - AST node to check.
 * @param {string | number} [expectedKind] - Optional expected keyword name or SyntaxKind.
 * @returns {boolean} True if the node matches the keyword type.
 */
export function isKeywordType(node, expectedKind) {
  if (!node || typeof node !== 'object' || !isKeywordTypeNode(node)) {
    return false;
  }
  if (expectedKind === undefined) {
    return true;
  }
  const targetKind = typeof expectedKind === 'string' ? KEYWORD_MAP[expectedKind.toLowerCase()] : expectedKind;
  return node.kind === targetKind;
}

/**
 * Returns the human-readable keyword name and syntax kind of a KeywordTypeNode.
 *
 * @param {object} node - KeywordTypeNode AST node.
 * @returns {object} Metadata with kind, kindName, and keywordName.
 */
export function getKeywordTypeName(node) {
  if (!node || typeof node !== 'object' || !isKeywordTypeNode(node)) {
    throw new TypeError('Expected a KeywordTypeNode AST node');
  }
  const kindName = formatSyntaxKind(node.kind);
  let keywordName = Object.keys(KEYWORD_MAP).find((k) => KEYWORD_MAP[k] === node.kind);
  if (!keywordName) {
    keywordName = kindName.replace(/Keyword$/, '').toLowerCase();
  }
  return {
    kind: node.kind,
    kindName,
    keywordName,
  };
}

/**
 * Maps a dictionary of field names to keyword types, returning an object of field -> AST node.
 *
 * @param {Record<string, string | number>} schema - Field name to keyword type map.
 * @returns {Record<string, object>} Field name to KeywordTypeNode map.
 */
export function createPrimitiveTypeMap(schema) {
  if (!schema || typeof schema !== 'object') {
    throw new TypeError('Expected schema object');
  }
  const result = {};
  for (const [key, val] of Object.entries(schema)) {
    result[key] = createKeywordType(val);
  }
  return result;
}

export {
  createKeywordTypeNode,
  SyntaxKind,
  formatSyntaxKind,
  isKeywordTypeNode,
};

import assert from 'node:assert/strict';
import {
  createKeywordTypeNode,
  createKeywordType,
  isKeywordType,
  getKeywordTypeName,
  createPrimitiveTypeMap,
  SyntaxKind,
  formatSyntaxKind,
  isKeywordTypeNode,
} from '../src/index.mjs';

// Contract 1: createKeywordTypeNode constructs keyword type nodes for primitive TypeScript types (string, number, boolean, void, any, unknown, never)
{
  const stringNode = createKeywordTypeNode(SyntaxKind.StringKeyword);
  assert.ok(stringNode, 'String keyword node should be defined');
  assert.strictEqual(isKeywordTypeNode(stringNode), true, 'stringNode should satisfy isKeywordTypeNode');
  assert.strictEqual(stringNode.kind, SyntaxKind.StringKeyword, 'Kind should be StringKeyword');
  assert.strictEqual(formatSyntaxKind(stringNode.kind), 'StringKeyword', 'Formatted kind name should be StringKeyword');

  const numberNode = createKeywordTypeNode(SyntaxKind.NumberKeyword);
  assert.ok(numberNode, 'Number keyword node should be defined');
  assert.strictEqual(isKeywordTypeNode(numberNode), true, 'numberNode should satisfy isKeywordTypeNode');
  assert.strictEqual(numberNode.kind, SyntaxKind.NumberKeyword, 'Kind should be NumberKeyword');

  const boolNode = createKeywordTypeNode(SyntaxKind.BooleanKeyword);
  assert.ok(boolNode, 'Boolean keyword node should be defined');
  assert.strictEqual(isKeywordTypeNode(boolNode), true, 'boolNode should satisfy isKeywordTypeNode');
  assert.strictEqual(boolNode.kind, SyntaxKind.BooleanKeyword, 'Kind should be BooleanKeyword');

  const voidNode = createKeywordTypeNode(SyntaxKind.VoidKeyword);
  assert.ok(voidNode, 'Void keyword node should be defined');
  assert.strictEqual(isKeywordTypeNode(voidNode), true, 'voidNode should satisfy isKeywordTypeNode');
  assert.strictEqual(voidNode.kind, SyntaxKind.VoidKeyword, 'Kind should be VoidKeyword');

  const anyNode = createKeywordTypeNode(SyntaxKind.AnyKeyword);
  assert.ok(anyNode, 'Any keyword node should be defined');
  assert.strictEqual(isKeywordTypeNode(anyNode), true, 'anyNode should satisfy isKeywordTypeNode');
  assert.strictEqual(anyNode.kind, SyntaxKind.AnyKeyword, 'Kind should be AnyKeyword');

  const unknownNode = createKeywordTypeNode(SyntaxKind.UnknownKeyword);
  assert.ok(unknownNode, 'Unknown keyword node should be defined');
  assert.strictEqual(isKeywordTypeNode(unknownNode), true, 'unknownNode should satisfy isKeywordTypeNode');
  assert.strictEqual(unknownNode.kind, SyntaxKind.UnknownKeyword, 'Kind should be UnknownKeyword');

  const neverNode = createKeywordTypeNode(SyntaxKind.NeverKeyword);
  assert.ok(neverNode, 'Never keyword node should be defined');
  assert.strictEqual(isKeywordTypeNode(neverNode), true, 'neverNode should satisfy isKeywordTypeNode');
  assert.strictEqual(neverNode.kind, SyntaxKind.NeverKeyword, 'Kind should be NeverKeyword');
}

// Contract 2: createKeywordType creates AST nodes for string names and SyntaxKind values using createKeywordTypeNode
{
  const primitives = ['string', 'number', 'boolean', 'void', 'any', 'unknown', 'never', 'undefined', 'symbol', 'bigint', 'object'];
  for (const prim of primitives) {
    const node = createKeywordType(prim);
    assert.ok(node, `Node for ${prim} should be defined`);
    assert.strictEqual(isKeywordTypeNode(node), true, `Node for ${prim} should satisfy isKeywordTypeNode`);
  }

  const directNode = createKeywordType(SyntaxKind.StringKeyword);
  assert.strictEqual(isKeywordTypeNode(directNode), true, 'Direct SyntaxKind node should satisfy isKeywordTypeNode');
  assert.strictEqual(directNode.kind, SyntaxKind.StringKeyword, 'Direct SyntaxKind node should have StringKeyword kind');

  const typeMap = createPrimitiveTypeMap({
    id: 'number',
    name: 'string',
    isActive: 'boolean',
  });
  assert.strictEqual(isKeywordTypeNode(typeMap.id), true, 'typeMap.id should be keyword type node');
  assert.strictEqual(typeMap.id.kind, SyntaxKind.NumberKeyword, 'typeMap.id kind should be NumberKeyword');
  assert.strictEqual(typeMap.name.kind, SyntaxKind.StringKeyword, 'typeMap.name kind should be StringKeyword');
  assert.strictEqual(typeMap.isActive.kind, SyntaxKind.BooleanKeyword, 'typeMap.isActive kind should be BooleanKeyword');

  assert.throws(() => createKeywordType('invalidType'), /Unknown keyword type name/, 'Should throw on invalid keyword name');
  assert.throws(() => createKeywordType(null), { name: 'TypeError' }, 'Should throw TypeError on null');
  assert.throws(() => createPrimitiveTypeMap(null), { name: 'TypeError' }, 'Should throw TypeError on null schema');
}

// Contract 3: isKeywordType validates AST nodes as keyword type nodes and checks expected SyntaxKind
{
  const strNode = createKeywordTypeNode(SyntaxKind.StringKeyword);
  assert.strictEqual(isKeywordType(strNode), true, 'isKeywordType without expected kind should be true');
  assert.strictEqual(isKeywordType(strNode, 'string'), true, 'isKeywordType with string kind should be true');
  assert.strictEqual(isKeywordType(strNode, SyntaxKind.StringKeyword), true, 'isKeywordType with SyntaxKind should be true');
  assert.strictEqual(isKeywordType(strNode, 'number'), false, 'isKeywordType with mismatched kind should be false');
  assert.strictEqual(isKeywordType(strNode, SyntaxKind.NumberKeyword), false, 'isKeywordType with mismatched SyntaxKind should be false');

  assert.strictEqual(isKeywordType({ kind: 1 }), false, 'Non-keyword object should return false for isKeywordType');
  assert.strictEqual(isKeywordType(null), false, 'null should return false for isKeywordType');
  assert.strictEqual(isKeywordType({}), false, 'plain object should return false for isKeywordType');
}

// Contract 4: getKeywordTypeName extracts human-readable keyword names and throws TypeError for non-keyword nodes
{
  const strNode = createKeywordTypeNode(SyntaxKind.StringKeyword);
  const strInfo = getKeywordTypeName(strNode);
  assert.strictEqual(strInfo.kind, SyntaxKind.StringKeyword, 'strInfo.kind should match StringKeyword');
  assert.strictEqual(strInfo.kindName, 'StringKeyword', 'strInfo.kindName should match StringKeyword');
  assert.strictEqual(strInfo.keywordName, 'string', 'strInfo.keywordName should match string');

  const numNode = createKeywordTypeNode(SyntaxKind.NumberKeyword);
  const numInfo = getKeywordTypeName(numNode);
  assert.strictEqual(numInfo.kind, SyntaxKind.NumberKeyword, 'numInfo.kind should match NumberKeyword');
  assert.strictEqual(numInfo.kindName, 'NumberKeyword', 'numInfo.kindName should match NumberKeyword');
  assert.strictEqual(numInfo.keywordName, 'number', 'numInfo.keywordName should match number');

  assert.throws(() => getKeywordTypeName(null), { name: 'TypeError' }, 'getKeywordTypeName should throw on null');
  assert.throws(() => getKeywordTypeName({ kind: 1 }), { name: 'TypeError' }, 'getKeywordTypeName should throw on non-keyword');
}

console.log('All pkg:npm/typescript@7.0.2 contracts passed successfully.');