espree 10.4.0: version

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 espree.version in pkg:npm/espree@10.4.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/espree@10.4.0
Demonstrate these symbols/APIs:
  - espree.version

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.

{"case":{"caseId":"case:sha256:7702ce72e2ae2f6f293a7c9e267d0eb093fda6d474915819a2bc3a6f4e6b5844","contract":["espree.version exports a valid semver string matching 10.4.0","espree.version matches package metadata defined in espree package.json","espree.version is an enumerable property of the espree namespace","espree parser operates consistently with the exported version when generating ESTree AST"],"goal":"verify espree.version in pkg:npm/espree@10.4.0","kind":"HOW","packages":["pkg:npm/espree@10.4.0"],"schemaVersion":1,"symbols":["espree.version"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/espree@10.4.0"],"schemaVersion":1,"subject":"pkg:npm/espree@10.4.0","symbols":["espree.version"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-espree-version",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-espree-version",
      "version": "1.0.0",
      "dependencies": {
        "espree": "10.4.0"
      }
    },
    "node_modules/acorn": {
      "version": "8.18.0",
      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.18.0.tgz",
      "integrity": "sha512-lGq+9yr1/GuAWaVYIHRjvvySG5/4VfKIvC8EWxStPdcDh/Ka7FG3twP6v4d5BkravUilhIAsG4Qj83t02LWUPQ==",
      "license": "MIT",
      "bin": {
        "acorn": "bin/acorn"
      },
      "engines": {
        "node": ">=0.4.0"
      }
    },
    "node_modules/acorn-jsx": {
      "version": "5.3.2",
      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.2.tgz",
      "integrity": "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==",
      "license": "MIT",
      "peerDependencies": {
        "acorn": "^6.0.0 || ^7.0.0 || ^8.0.0"
      }
    },
    "node_modules/eslint-visitor-keys": {
      "version": "4.2.1",
      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.2.1.tgz",
      "integrity": "sha512-Uhdk5sfqcee/9H/rCOJikYz67o0a2Tw2hGRPOG2Y1R2dg7brRe1uG0yaNQDHu+TO/uQPF/5eCapvYSmHUjt7JQ==",
      "license": "Apache-2.0",
      "engines": {
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      },
      "funding": {
        "url": "https://opencollective.com/eslint"
      }
    },
    "node_modules/espree": {
      "version": "10.4.0",
      "resolved": "https://registry.npmjs.org/espree/-/espree-10.4.0.tgz",
      "integrity": "sha512-j6PAQ2uUr79PZhBjP5C5fhl8e39FmRnOjsD5lGnWrFU8i2G776tBK7+nP8KuQUTTyAZUwfQqXAgrVH5MbH9CYQ==",
      "license": "BSD-2-Clause",
      "dependencies": {
        "acorn": "^8.15.0",
        "acorn-jsx": "^5.3.2",
        "eslint-visitor-keys": "^4.2.1"
      },
      "engines": {
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      },
      "funding": {
        "url": "https://opencollective.com/eslint"
      }
    }
  }
}

{
  "name": "sample-espree-version",
  "version": "1.0.0",
  "description": "Clean-room verification sample for espree.version",
  "main": "test/contract.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "espree": "10.4.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify espree.version in pkg:npm/espree@10.4.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/espree@10.4.0"
  ],
  "symbols": [
    "espree.version"
  ]
}

const assert = require("assert");
const espree = require("espree");

// 1. espree.version exports a valid semver string matching 10.4.0
assert.strictEqual(typeof espree.version, "string", "espree.version must be a string");
assert.strictEqual(espree.version, "10.4.0", "espree.version must equal 10.4.0");
assert.match(espree.version, /^\d+\.\d+\.\d+$/, "espree.version must follow semver format");

// 2. espree.version matches package metadata defined in espree package.json
const pkg = require("espree/package.json");
assert.strictEqual(espree.version, pkg.version, "espree.version must match package.json version");

// 3. espree.version is an enumerable property of the espree namespace
assert.ok("version" in espree, "version must be present on espree namespace");
assert.ok(Object.keys(espree).includes("version"), "espree.version must be enumerable");

// 4. espree parser operates consistently with the exported version when generating ESTree AST
const ast = espree.parse("const answer = 42;", { ecmaVersion: "latest" });
assert.strictEqual(ast.type, "Program");
assert.strictEqual(ast.body.length, 1);
assert.strictEqual(ast.body[0].type, "VariableDeclaration");
assert.strictEqual(ast.body[0].declarations[0].id.name, "answer");
assert.strictEqual(ast.body[0].declarations[0].init.value, 42);

console.log("espree.version contract passed");