eslint-scope 8.4.0

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/eslint-scope@8.4.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/eslint-scope@8.4.0
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.

{"case":{"caseId":"case:sha256:82b6ef1cfcfd64384ccf8520d56307a5bcfc7aa47cbd6867292af3720e798d89","constraints":{"executionContext":"node"},"contract":["analyze extracts destructured object and array identifiers into parameter variable definitions","hoists var declarations across block boundaries to enclosing function scope","creates block scope for lexical let and const declarations without containing hoisted var","creates catch scope containing CatchClause parameter definition","tracks childScopes hierarchy and variableScope references across nested blocks"],"goal":"verify pkg:npm/eslint-scope@8.4.0","kind":"HOW","packages":["pkg:npm/eslint-scope@8.4.0"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/eslint-scope@8.4.0"],"schemaVersion":1,"subject":"pkg:npm/eslint-scope@8.4.0","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-eslint-scope",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-eslint-scope",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "eslint-scope": "8.4.0"
      }
    },
    "node_modules/eslint-scope": {
      "version": "8.4.0",
      "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-8.4.0.tgz",
      "integrity": "sha512-sNXOfKCn74rt8RICKMvJS7XKV/Xk9kA7DyJr8mJik3S7Cwgy3qlkkmyS2uQB3jiJg6VNdZd/pDBJu0nvG2NlTg==",
      "license": "BSD-2-Clause",
      "dependencies": {
        "esrecurse": "^4.3.0",
        "estraverse": "^5.2.0"
      },
      "engines": {
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      },
      "funding": {
        "url": "https://opencollective.com/eslint"
      }
    },
    "node_modules/esrecurse": {
      "version": "4.3.0",
      "resolved": "https://registry.npmjs.org/esrecurse/-/esrecurse-4.3.0.tgz",
      "integrity": "sha512-KmfKL3b6G+RXvP8N1vr3Tq1kL/oCFgn2NYXEtqP8/L3pKapUA4G8cFVaoF3SU323CD4XypR/ffioHmkti6/Tag==",
      "license": "BSD-2-Clause",
      "dependencies": {
        "estraverse": "^5.2.0"
      },
      "engines": {
        "node": ">=4.0"
      }
    },
    "node_modules/estraverse": {
      "version": "5.3.0",
      "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-5.3.0.tgz",
      "integrity": "sha512-MMdARuVEQziNTeJD8DgMqmhwR11BRQ/cBP+pLtYdSTnf3MIO8fFeiINEbX36ZdNlfU/7A9f3gUw49B3oQsvwBA==",
      "license": "BSD-2-Clause",
      "engines": {
        "node": ">=4.0"
      }
    }
  }
}

{
  "name": "sample-eslint-scope",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "eslint-scope": "8.4.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/eslint-scope@8.4.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/eslint-scope@8.4.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const { analyze } = require('eslint-scope');

// Build an ESTree AST representing destructuring parameters, block scoping with var hoisting, and catch clause
const functionNode = {
  type: 'FunctionDeclaration',
  range: [0, 260],
  id: { type: 'Identifier', name: 'processData', range: [9, 20] },
  params: [
    {
      type: 'ObjectPattern',
      range: [21, 45],
      properties: [
        {
          type: 'Property',
          range: [23, 25],
          kind: 'init',
          shorthand: true,
          key: { type: 'Identifier', name: 'id', range: [23, 25] },
          value: { type: 'Identifier', name: 'id', range: [23, 25] }
        },
        {
          type: 'Property',
          range: [27, 43],
          kind: 'init',
          shorthand: false,
          key: { type: 'Identifier', name: 'meta', range: [27, 31] },
          value: {
            type: 'ArrayPattern',
            range: [33, 43],
            elements: [
              { type: 'Identifier', name: 'tag', range: [34, 37] }
            ]
          }
        }
      ]
    }
  ],
  body: {
    type: 'BlockStatement',
    range: [47, 260],
    body: [
      {
        type: 'VariableDeclaration',
        kind: 'var',
        range: [53, 72],
        declarations: [
          {
            type: 'VariableDeclarator',
            range: [57, 71],
            id: { type: 'Identifier', name: 'hoistedVar', range: [57, 67] },
            init: { type: 'Literal', value: 10, range: [70, 72] }
          }
        ]
      },
      {
        type: 'IfStatement',
        range: [77, 175],
        test: { type: 'Literal', value: true, range: [81, 85] },
        consequent: {
          type: 'BlockStatement',
          range: [87, 175],
          body: [
            {
              type: 'VariableDeclaration',
              kind: 'let',
              range: [97, 122],
              declarations: [
                {
                  type: 'VariableDeclarator',
                  range: [101, 121],
                  id: { type: 'Identifier', name: 'blockScopedLet', range: [101, 115] },
                  init: { type: 'Literal', value: 20, range: [118, 120] }
                }
              ]
            },
            {
              type: 'VariableDeclaration',
              kind: 'var',
              range: [133, 163],
              declarations: [
                {
                  type: 'VariableDeclarator',
                  range: [137, 162],
                  id: { type: 'Identifier', name: 'nestedHoistedVar', range: [137, 153] },
                  init: { type: 'Literal', value: 30, range: [156, 158] }
                }
              ]
            }
          ]
        },
        alternate: null
      },
      {
        type: 'TryStatement',
        range: [180, 256],
        block: {
          type: 'BlockStatement',
          range: [184, 190],
          body: []
        },
        handler: {
          type: 'CatchClause',
          range: [191, 256],
          param: { type: 'Identifier', name: 'err', range: [198, 201] },
          body: {
            type: 'BlockStatement',
            range: [203, 256],
            body: [
              {
                type: 'VariableDeclaration',
                kind: 'const',
                range: [215, 246],
                declarations: [
                  {
                    type: 'VariableDeclarator',
                    range: [221, 245],
                    id: { type: 'Identifier', name: 'caughtMessage', range: [221, 234] },
                    init: {
                      type: 'MemberExpression',
                      range: [237, 248],
                      object: { type: 'Identifier', name: 'err', range: [237, 240] },
                      property: { type: 'Identifier', name: 'message', range: [241, 248] },
                      computed: false
                    }
                  }
                ]
              }
            ]
          }
        },
        finalizer: null
      }
    ]
  }
};

const ast = {
  type: 'Program',
  range: [0, 260],
  sourceType: 'module',
  body: [functionNode]
};

const scopeManager = analyze(ast, { ecmaVersion: 2022, sourceType: 'module' });

// 1. analyze extracts destructured object and array identifiers into parameter variable definitions
const moduleScope = scopeManager.scopes.find(s => s.type === 'module');
assert.ok(moduleScope, 'ModuleScope should be present');

const functionScope = scopeManager.acquire(functionNode);
assert.ok(functionScope, 'FunctionScope should be acquired from FunctionDeclaration');
assert.equal(functionScope.type, 'function');

const idVar = functionScope.set.get('id');
assert.ok(idVar, 'id variable from ObjectPattern destructuring should exist in function scope');
assert.equal(idVar.defs.length, 1);
assert.equal(idVar.defs[0].type, 'Parameter');
assert.equal(idVar.defs[0].name.name, 'id');

const tagVar = functionScope.set.get('meta') || functionScope.set.get('tag');
assert.ok(tagVar, 'tag variable from nested ArrayPattern destructuring should exist in function scope');
assert.equal(tagVar.name, 'tag');
assert.equal(tagVar.defs[0].type, 'Parameter');

// 2. hoists var declarations across block boundaries to enclosing function scope
assert.ok(functionScope.set.has('hoistedVar'), 'hoistedVar should be defined in function scope');
assert.ok(functionScope.set.has('nestedHoistedVar'), 'nestedHoistedVar inside if-block should be hoisted to function scope');
const nestedHoisted = functionScope.set.get('nestedHoistedVar');
assert.equal(nestedHoisted.defs[0].type, 'Variable');

// 3. creates block scope for lexical let and const declarations without containing hoisted var
const ifConsequentBlock = functionNode.body.body[1].consequent;
const blockScope = scopeManager.acquire(ifConsequentBlock);
assert.ok(blockScope, 'BlockScope should be acquired from if consequent block');
assert.equal(blockScope.type, 'block');
assert.equal(blockScope.upper, functionScope);
assert.equal(blockScope.variableScope, functionScope);
assert.ok(blockScope.set.has('blockScopedLet'), 'blockScopedLet must exist in block scope');
assert.equal(blockScope.set.has('nestedHoistedVar'), false, 'nestedHoistedVar must NOT be bound in block scope set');

// 4. creates catch scope containing CatchClause parameter definition
const catchClause = functionNode.body.body[2].handler;
const catchScope = scopeManager.acquire(catchClause);
assert.ok(catchScope, 'CatchScope should be acquired from CatchClause');
assert.equal(catchScope.type, 'catch');
assert.equal(catchScope.upper, functionScope);
assert.ok(catchScope.set.has('err'), 'err parameter should be defined in catch scope');

const errVar = catchScope.set.get('err');
assert.equal(errVar.defs[0].type, 'CatchClause');
assert.equal(errVar.references.length, 1);
assert.ok(errVar.references[0].isRead(), 'err reference in member expression should be a read');

// 5. tracks childScopes hierarchy and variableScope references across nested blocks
assert.ok(functionScope.childScopes.includes(blockScope), 'functionScope.childScopes must contain blockScope');
assert.ok(functionScope.childScopes.includes(catchScope), 'functionScope.childScopes must contain catchScope');
const catchBodyBlock = catchClause.body;
const catchBlockScope = scopeManager.acquire(catchBodyBlock);
assert.ok(catchBlockScope, 'Catch body BlockScope should exist');
assert.equal(catchBlockScope.upper, catchScope);
assert.equal(catchBlockScope.variableScope, functionScope);
assert.ok(catchBlockScope.set.has('caughtMessage'), 'caughtMessage const must exist in catch body block scope');