typescript 7.0.2: formatSyntaxKind

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.formatSyntaxKind 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.formatSyntaxKind

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-formatsyntaxkind-sample",
  "version": "1.0.0",
  "description": "verify typescript.formatSyntaxKind in pkg:npm/typescript@7.0.2",
  "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.formatSyntaxKind in pkg:npm/typescript@7.0.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/typescript@7.0.2"
  ],
  "symbols": [
    "typescript.formatSyntaxKind"
  ]
}

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

/**
 * Formats a numeric SyntaxKind value into its human-readable string representation.
 *
 * @param {number} kind - The SyntaxKind enum value or numeric kind.
 * @returns {string} The formatted name of the syntax kind.
 */
export function formatKind(kind) {
  return formatSyntaxKind(kind);
}

/**
 * Extracts and formats the SyntaxKind from an AST node.
 *
 * @param {{ kind: number }} node - An AST node object with a numeric kind property.
 * @returns {string} The formatted name of the AST node's syntax kind.
 */
export function formatNodeKind(node) {
  if (!node || typeof node.kind !== 'number') {
    throw new TypeError('Expected an AST node object with numeric kind property');
  }
  return formatSyntaxKind(node.kind);
}

/**
 * Formats an array of numeric SyntaxKind values into an array of readable names.
 *
 * @param {number[]} kinds - Array of numeric SyntaxKind values.
 * @returns {string[]} Array of formatted syntax kind names.
 */
export function formatTokenKinds(kinds) {
  if (!Array.isArray(kinds)) {
    throw new TypeError('Expected kinds to be an array of numbers');
  }
  return kinds.map((k) => formatSyntaxKind(k));
}

/**
 * Scans source code and returns tokens enriched with formatted syntax kind names.
 *
 * @param {string} sourceText - Source code string to scan.
 * @param {object} [options={}] - Scanning options.
 * @param {boolean} [options.skipTrivia=true] - Whether to skip trivia tokens.
 * @param {number} [options.languageVariant=LanguageVariant.Standard] - Language variant.
 * @returns {Array<{ kind: number, kindName: string, text: string, start: number, end: number }>}
 */
export function inspectAndFormatTokens(sourceText, options = {}) {
  const skipTrivia = options.skipTrivia !== false;
  const languageVariant = options.languageVariant ?? LanguageVariant.Standard;
  const scanner = createScanner(skipTrivia, languageVariant, sourceText);

  const results = [];
  let token;
  while ((token = scanner.scan()) !== SyntaxKind.EndOfFile) {
    results.push({
      kind: token,
      kindName: formatSyntaxKind(token),
      text: scanner.getTokenText(),
      start: scanner.getTokenStart(),
      end: scanner.getTokenEnd(),
    });
  }
  return results;
}

export { formatSyntaxKind, SyntaxKind, createScanner, LanguageVariant };

import assert from 'node:assert/strict';
import {
  formatKind,
  formatNodeKind,
  formatTokenKinds,
  inspectAndFormatTokens,
  formatSyntaxKind,
  SyntaxKind,
} from '../src/index.mjs';

// Contract 1: formatKind returns the canonical string name for standard SyntaxKind enum values using formatSyntaxKind
{
  assert.strictEqual(formatKind(SyntaxKind.Unknown), 'Unknown');
  assert.strictEqual(formatKind(SyntaxKind.Identifier), 'Identifier');
  assert.strictEqual(formatKind(SyntaxKind.SourceFile), 'SourceFile');
  assert.strictEqual(formatKind(SyntaxKind.FunctionDeclaration), 'FunctionDeclaration');
  assert.strictEqual(formatKind(SyntaxKind.ReturnStatement), 'ReturnStatement');
  assert.strictEqual(formatKind(SyntaxKind.NumericLiteral), 'NumericLiteral');
  assert.strictEqual(formatKind(SyntaxKind.StringLiteral), 'StringLiteral');
  assert.strictEqual(formatKind(SyntaxKind.PlusToken), 'PlusToken');
  assert.strictEqual(formatKind(SyntaxKind.ExportKeyword), 'ExportKeyword');
}

// Contract 2: formatKind returns formatted Unknown representation for unrecognized numeric syntax kind values
{
  const unknownCustomKind = 99999;
  const formattedUnknown = formatKind(unknownCustomKind);
  assert.strictEqual(formattedUnknown, 'Unknown(99999)');

  const negativeKind = -5;
  const formattedNegative = formatKind(negativeKind);
  assert.strictEqual(formattedNegative, 'Unknown(-5)');
}

// Contract 3: formatNodeKind extracts and formats the SyntaxKind of AST node objects using formatSyntaxKind
{
  const mockFuncNode = { kind: SyntaxKind.FunctionDeclaration, name: 'compute' };
  const mockClassNode = { kind: SyntaxKind.ClassDeclaration, name: 'Calculator' };
  const mockVarNode = { kind: SyntaxKind.VariableStatement };
  const mockIfNode = { kind: SyntaxKind.IfStatement };

  assert.strictEqual(formatNodeKind(mockFuncNode), 'FunctionDeclaration');
  assert.strictEqual(formatNodeKind(mockClassNode), 'ClassDeclaration');
  assert.strictEqual(formatNodeKind(mockVarNode), 'VariableStatement');
  assert.strictEqual(formatNodeKind(mockIfNode), 'IfStatement');

  assert.throws(() => formatNodeKind(null), { name: 'TypeError' });
  assert.throws(() => formatNodeKind({}), { name: 'TypeError' });
}

// Contract 4: formatTokenKinds formats an array of token kind numbers into an array of readable syntax kind names
{
  const kinds = [
    SyntaxKind.ConstKeyword,
    SyntaxKind.Identifier,
    SyntaxKind.EqualsToken,
    SyntaxKind.NumericLiteral,
    SyntaxKind.SemicolonToken,
  ];

  const formatted = formatTokenKinds(kinds);
  assert.deepStrictEqual(formatted, [
    'ConstKeyword',
    'Identifier',
    'EqualsToken',
    'NumericLiteral',
    'SemicolonToken',
  ]);
}

// Contract 5: inspectAndFormatTokens scans source code and attaches formatted syntax kind names to tokens
{
  const code = 'export const total = 100;';
  const tokens = inspectAndFormatTokens(code);

  assert.ok(Array.isArray(tokens));
  assert.strictEqual(tokens.length, 6);

  const kindNames = tokens.map((t) => t.kindName);
  assert.deepStrictEqual(kindNames, [
    'ExportKeyword',
    'ConstKeyword',
    'Identifier',
    'EqualsToken',
    'NumericLiteral',
    'SemicolonToken',
  ]);

  const texts = tokens.map((t) => t.text);
  assert.deepStrictEqual(texts, ['export', 'const', 'total', '=', '100', ';']);
}

console.log('All typescript.formatSyntaxKind contracts passed successfully.');