CodeSampleX

Sample

@typescript-eslint/parser 8.66.0: parse

Verified sample for npm @typescript-eslint/parser 8.66.0: parse. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:eca7c96806b67cda7ef3244e9d584cd89369fdf874402c8db7c71a939cbc5e7a

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 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

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-eslint/parser.parse in pkg:npm/%40typescript-eslint/parser@8.66.0
Packages
Symbols
  • @typescript-eslint/parser.parse
Environment
node 22.23.2
Created
2026-08-28T03:10:03Z

Contract

  1. parse produces a Program AST with body nodes from TypeScript variable declarations and type annotations
  2. parse handles TypeScript interface and type alias declarations returning TSInterfaceDeclaration and TSTypeAliasDeclaration nodes
  3. parse supports parsing options including loc, range, tokens, and comment metadata
  4. parse supports JSX and TypeScript generic syntax in expressions and functions
  5. parse throws a syntax error when parsing invalid TypeScript code

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • 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-eslint/parser.parse in pkg:npm/%40typescript-eslint/parser@8.66.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40typescript-eslint/parser@8.66.0
Demonstrate these symbols/APIs:
  - @typescript-eslint/parser.parse
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.
csx.json
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package-lock.json
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package.json
{
  "name": "sample-typescript-eslint-parser",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of @typescript-eslint/parser",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "@typescript-eslint/parser": "8.66.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @typescript-eslint/parser.parse in pkg:npm/%40typescript-eslint/parser@8.66.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40typescript-eslint/parser@8.66.0"
  ],
  "symbols": [
    "@typescript-eslint/parser.parse"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.js
const { parse } = require('@typescript-eslint/parser');

/**
 * Parses TypeScript or JavaScript code into an ESTree-compatible Program AST.
 * @param {string} code
 * @param {object} [options={}]
 * @returns {object}
 */
function parseTypeScript(code, options = {}) {
  return parse(code, options);
}

/**
 * Parses TypeScript code and returns top-level statement types.
 * @param {string} code
 * @param {object} [options={}]
 * @returns {string[]}
 */
function getTopLevelStatementTypes(code, options = {}) {
  const ast = parse(code, options);
  return ast.body.map((node) => node.type);
}

/**
 * Parses TypeScript code and extracts declared interface names.
 * @param {string} code
 * @param {object} [options={}]
 * @returns {string[]}
 */
function extractInterfaceNames(code, options = {}) {
  const ast = parse(code, options);
  const names = [];
  for (const node of ast.body) {
    if (node.type === 'TSInterfaceDeclaration') {
      names.push(node.id.name);
    } else if (
      node.type === 'ExportNamedDeclaration' &&
      node.declaration &&
      node.declaration.type === 'TSInterfaceDeclaration'
    ) {
      names.push(node.declaration.id.name);
    }
  }
  return names;
}

/**
 * Parses TypeScript code with full metadata options (loc, range, tokens, comments).
 * @param {string} code
 * @returns {object}
 */
function parseWithMetadata(code) {
  return parse(code, {
    loc: true,
    range: true,
    tokens: true,
    comment: true,
  });
}

module.exports = {
  parse,
  parseTypeScript,
  getTopLevelStatementTypes,
  extractInterfaceNames,
  parseWithMetadata,
};
test/contract.mjs
import assert from 'node:assert';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const {
  parse,
  parseTypeScript,
  getTopLevelStatementTypes,
  extractInterfaceNames,
  parseWithMetadata,
} = require('../src/index.js');

async function runContract() {
  // 1. parse produces a Program AST with body nodes from TypeScript variable declarations and type annotations
  const tsVarCode = 'const count: number = 42;';
  const ast1 = parseTypeScript(tsVarCode);
  assert.strictEqual(ast1.type, 'Program');
  assert.strictEqual(ast1.body.length, 1);
  const varDecl = ast1.body[0];
  assert.strictEqual(varDecl.type, 'VariableDeclaration');
  assert.strictEqual(varDecl.kind, 'const');
  const declarator = varDecl.declarations[0];
  assert.strictEqual(declarator.id.name, 'count');
  assert.strictEqual(declarator.id.typeAnnotation.type, 'TSTypeAnnotation');
  assert.strictEqual(declarator.id.typeAnnotation.typeAnnotation.type, 'TSNumberKeyword');
  assert.strictEqual(declarator.init.value, 42);

  // 2. parse handles TypeScript interface and type alias declarations returning TSInterfaceDeclaration and TSTypeAliasDeclaration nodes
  const tsTypesCode = `
    interface User {
      id: number;
      name: string;
    }
    type UserId = number | string;
  `;
  const ast2 = parse(tsTypesCode);
  assert.strictEqual(ast2.body.length, 2);
  const ifaceNode = ast2.body[0];
  assert.strictEqual(ifaceNode.type, 'TSInterfaceDeclaration');
  assert.strictEqual(ifaceNode.id.name, 'User');
  assert.strictEqual(ifaceNode.body.body.length, 2);
  assert.strictEqual(ifaceNode.body.body[0].type, 'TSPropertySignature');
  assert.strictEqual(ifaceNode.body.body[0].key.name, 'id');

  const typeAliasNode = ast2.body[1];
  assert.strictEqual(typeAliasNode.type, 'TSTypeAliasDeclaration');
  assert.strictEqual(typeAliasNode.id.name, 'UserId');
  assert.strictEqual(typeAliasNode.typeAnnotation.type, 'TSUnionType');

  const names = extractInterfaceNames(tsTypesCode);
  assert.deepStrictEqual(names, ['User']);

  // 3. parse supports parsing options including loc, range, tokens, and comment metadata
  const commentedCode = `
    // Leading comment
    const greeting: string = "hello"; /* trailing comment */
  `;
  const metaAst = parseWithMetadata(commentedCode);
  assert.ok(metaAst.loc !== undefined, 'loc should be defined');
  assert.ok(Array.isArray(metaAst.range), 'range should be an array');
  assert.ok(metaAst.range[0] >= 0, 'range start should be >= 0');
  assert.ok(Array.isArray(metaAst.tokens), 'tokens should be an array');
  assert.ok(metaAst.tokens.length > 0, 'tokens should not be empty');
  assert.ok(Array.isArray(metaAst.comments), 'comments should be an array');
  assert.strictEqual(metaAst.comments.length, 2);
  assert.strictEqual(metaAst.comments[0].type, 'Line');
  assert.strictEqual(metaAst.comments[0].value.trim(), 'Leading comment');
  assert.strictEqual(metaAst.comments[1].type, 'Block');
  assert.strictEqual(metaAst.comments[1].value.trim(), 'trailing comment');

  // 4. parse supports JSX and TypeScript generic syntax in expressions and functions
  const genericJsxCode = 'function identity<T>(arg: T): T { return arg; }';
  const genericAst = parse(genericJsxCode);
  assert.strictEqual(genericAst.body[0].type, 'FunctionDeclaration');
  assert.strictEqual(genericAst.body[0].id.name, 'identity');
  assert.ok(genericAst.body[0].typeParameters !== undefined, 'typeParameters should be present');
  assert.strictEqual(genericAst.body[0].typeParameters.type, 'TSTypeParameterDeclaration');
  assert.strictEqual(genericAst.body[0].typeParameters.params[0].name.name, 'T');

  const jsxCode = 'const el = <div className="test">Hello</div>;';
  const jsxAst = parse(jsxCode, { jsx: true });
  assert.strictEqual(jsxAst.body[0].declarations[0].init.type, 'JSXElement');
  assert.strictEqual(jsxAst.body[0].declarations[0].init.openingElement.name.name, 'div');

  // 5. parse throws a syntax error when parsing invalid TypeScript code
  const invalidCode = 'const x: = ;';
  assert.throws(
    () => parse(invalidCode),
    (err) => {
      return err instanceof SyntaxError || (err && typeof err.message === 'string');
    },
    'parse should throw when code contains syntax errors'
  );

  console.log('Contract assertions passed successfully.');
}

runContract().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});

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