CodeSampleX

Sample

typescript 7.0.2: formatSyntaxKind

Verified sample for npm typescript 7.0.2: formatSyntaxKind. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:2998b3201b504a2425cae1b5410e29b53db79f3a0bfc006676c4c7447277e8ba

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-28

Case

HOW
Goal
verify typescript.formatSyntaxKind in pkg:npm/typescript@7.0.2
Packages
Symbols
  • typescript.formatSyntaxKind
Created
2026-08-28T07:46:33Z

Contract

  1. formatKind returns the canonical string name for standard SyntaxKind enum values using formatSyntaxKind
  2. formatKind returns formatted Unknown representation for unrecognized numeric syntax kind values
  3. formatNodeKind extracts and formats the SyntaxKind of AST node objects using formatSyntaxKind
  4. formatTokenKinds formats an array of token kind numbers into an array of readable syntax kind names
  5. inspectAndFormatTokens scans source code and attaches formatted syntax kind names to tokens

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

PROMPT.md
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.
csx.json
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package-lock.json
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}
package.json
{
  "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"
}
spec.json
{
  "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"
  ]
}
src/index.mjs
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 };
test/contract.mjs
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.');

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