@typescript-eslint/typescript-estree 8.65.0

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 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
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": "sample-typescript-eslint-typescript-estree",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-typescript-eslint-typescript-estree",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@typescript-eslint/typescript-estree": "8.65.0"
      }
    },
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}

{
  "name": "sample-typescript-eslint-typescript-estree",
  "version": "1.0.0",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "@typescript-eslint/typescript-estree": "8.65.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40typescript-eslint/typescript-estree@8.65.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40typescript-eslint/typescript-estree@8.65.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

const assert = require("node:assert/strict");
const {
  parse,
  parseAndGenerateServices,
  simpleTraverse,
  AST_NODE_TYPES,
  AST_TOKEN_TYPES,
  TSError,
  clearCaches,
  version
} = require("@typescript-eslint/typescript-estree");

// 1. assert parse converts TypeScript source code into ESTree AST with comments and tokens
const tsCode = `
// Greeter interface definition
interface User {
  id: number;
  name: string;
}

const greet = (user: User): string => {
  return "Hello, " + user.name;
};
`;

const ast = parse(tsCode, {
  loc: true,
  range: true,
  tokens: true,
  comment: true
});

assert.strictEqual(ast.type, AST_NODE_TYPES.Program);
assert.strictEqual(ast.body.length, 2);
assert.strictEqual(ast.body[0].type, AST_NODE_TYPES.TSInterfaceDeclaration);
assert.strictEqual(ast.body[0].id.name, "User");
assert.strictEqual(ast.body[1].type, AST_NODE_TYPES.VariableDeclaration);
assert.ok(Array.isArray(ast.comments));
assert.strictEqual(ast.comments.length, 1);
assert.strictEqual(ast.comments[0].value.trim(), "Greeter interface definition");
assert.ok(Array.isArray(ast.tokens));
assert.ok(ast.tokens.some((t) => t.type === AST_TOKEN_TYPES.Identifier && t.value === "greet"));

// 2. assert parseAndGenerateServices returns AST and AST-to-TS node mapping services
const servicesResult = parseAndGenerateServices(tsCode, {
  loc: true,
  range: true
});

assert.strictEqual(servicesResult.ast.type, AST_NODE_TYPES.Program);
assert.ok(servicesResult.services);
assert.ok(servicesResult.services.esTreeNodeToTSNodeMap);
assert.ok(servicesResult.services.tsNodeToESTreeNodeMap);
const interfaceNode = servicesResult.ast.body[0];
const tsNode = servicesResult.services.esTreeNodeToTSNodeMap.get(interfaceNode);
assert.ok(tsNode);

// 3. assert simpleTraverse visits all AST nodes in traversal hierarchy
const visitedTypes = [];
simpleTraverse(ast, {
  enter(node) {
    visitedTypes.push(node.type);
  }
});

assert.ok(visitedTypes.includes(AST_NODE_TYPES.Program));
assert.ok(visitedTypes.includes(AST_NODE_TYPES.TSInterfaceDeclaration));
assert.ok(visitedTypes.includes(AST_NODE_TYPES.TSPropertySignature));
assert.ok(visitedTypes.includes(AST_NODE_TYPES.ArrowFunctionExpression));
assert.ok(visitedTypes.includes(AST_NODE_TYPES.ReturnStatement));

// 4. assert parse throws TSError on invalid TypeScript syntax
let threwSyntaxError = false;
try {
  parse("const invalid syntax :::", {});
} catch (err) {
  threwSyntaxError = true;
  assert.ok(err.lineNumber !== undefined || err.index !== undefined);
}
assert.strictEqual(threwSyntaxError, true);

// 5. assert clearCaches resets parser caches
assert.doesNotThrow(() => {
  clearCaches();
});