@typescript-eslint/typescript-estree 8.65.0: parse

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/typescript-estree.parse in pkg:npm/%40typescript-eslint/typescript-estree@8.65.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40typescript-eslint/typescript-estree@8.65.0
Demonstrate these symbols/APIs:
  - @typescript-eslint/typescript-estree.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.

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{
  "name": "verify-typescript-estree-parse",
  "version": "1.0.0",
  "private": true,
  "description": "verify @typescript-eslint/typescript-estree.parse in pkg:npm/@typescript-eslint/typescript-estree@8.65.0",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.cjs"
  },
  "dependencies": {
    "@typescript-eslint/typescript-estree": "8.65.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @typescript-eslint/typescript-estree.parse in pkg:npm/%40typescript-eslint/typescript-estree@8.65.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40typescript-eslint/typescript-estree@8.65.0"
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  "symbols": [
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}

const { parse } = require('@typescript-eslint/typescript-estree');

/**
 * Parses TypeScript source code into an ESTree AST.
 *
 * @param {string} code - TypeScript source code
 * @param {object} [options={}] - Parser options
 * @returns {object} ESTree Program AST node
 */
function parseCode(code, options = {}) {
  return parse(code, {
    loc: true,
    range: true,
    ...options,
  });
}

/**
 * Parses TSX / JSX source code into an ESTree AST.
 *
 * @param {string} code - TSX source code
 * @param {object} [options={}] - Additional parser options
 * @returns {object} ESTree Program AST node
 */
function parseTSX(code, options = {}) {
  return parse(code, {
    loc: true,
    range: true,
    jsx: true,
    ...options,
  });
}

module.exports = {
  parseCode,
  parseTSX,
};

const assert = require('node:assert/strict');
const { parse } = require('@typescript-eslint/typescript-estree');
const { parseCode, parseTSX } = require('../src/index.js');

// 1. parse parses TypeScript variable declarations with type annotations
const tsVarCode = 'const count: number = 100;';
const varAst = parseCode(tsVarCode);

assert.strictEqual(varAst.type, 'Program');
assert.strictEqual(varAst.body.length, 1);

const varDecl = varAst.body[0];
assert.strictEqual(varDecl.type, 'VariableDeclaration');
assert.strictEqual(varDecl.kind, 'const');
assert.strictEqual(varDecl.declarations.length, 1);

const declarator = varDecl.declarations[0];
assert.strictEqual(declarator.id.name, 'count');
assert.strictEqual(declarator.id.typeAnnotation.typeAnnotation.type, 'TSNumberKeyword');
assert.strictEqual(declarator.init.value, 100);

// 2. parse parses TypeScript functions with typed parameters and return types
const tsFnCode = 'function greet(name: string): string { return "Hello, " + name; }';
const fnAst = parse(tsFnCode, { loc: true, range: true });

assert.strictEqual(fnAst.type, 'Program');
assert.strictEqual(fnAst.body.length, 1);

const fnDecl = fnAst.body[0];
assert.strictEqual(fnDecl.type, 'FunctionDeclaration');
assert.strictEqual(fnDecl.id.name, 'greet');
assert.strictEqual(fnDecl.params.length, 1);
assert.strictEqual(fnDecl.params[0].name, 'name');
assert.strictEqual(fnDecl.params[0].typeAnnotation.typeAnnotation.type, 'TSStringKeyword');
assert.strictEqual(fnDecl.returnType.typeAnnotation.type, 'TSStringKeyword');

// 3. parse produces AST with Program root node containing valid loc and range metadata
assert.ok(varAst.loc !== undefined, 'loc should be present');
assert.strictEqual(varAst.loc.start.line, 1);
assert.strictEqual(varAst.loc.start.column, 0);
assert.ok(varAst.range !== undefined, 'range should be present');
assert.strictEqual(varAst.range[0], 0);
assert.strictEqual(varAst.range[1], tsVarCode.length);

// 4. parse throws an error on invalid TypeScript syntax
let syntaxError = null;
try {
  parse('const invalid :::: syntax = ;');
} catch (err) {
  syntaxError = err;
}
assert.ok(syntaxError, 'Should throw an error on syntax violation');

// 5. parse supports JSX and TSX syntax when jsx option is enabled
const tsxCode = 'const el = <div className="card"><span>Hello</span></div>;';
const tsxAst = parseTSX(tsxCode);

assert.strictEqual(tsxAst.type, 'Program');
const tsxVarDecl = tsxAst.body[0].declarations[0];
assert.strictEqual(tsxVarDecl.init.type, 'JSXElement');
assert.strictEqual(tsxVarDecl.init.openingElement.name.name, 'div');

console.log('All contract assertions passed successfully.');