CodeSampleX

Sample

@eslint-community/eslint-utils 4.10.1

Verified sample for npm @eslint-community/eslint-utils 4.10.1. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:04b93e31c8918063943f88f1aeed94761557f536dc13dc0b15f792d78279c3de

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

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@1		 2026-08-20

Case

HOW
Goal
verify pkg:npm/%40eslint-community/eslint-utils@4.10.1
Packages
Environment
node 22.23.2
Created
2026-08-20T23:45:49Z

Contract

  1. getPropertyName extracts static and computed property names from MemberExpression and Property AST nodes
  2. getStaticValue evaluates constant literal expressions, template literals, and binary operations to their static runtime values
  3. getStringIfConstant converts constant literals or static template literals into string representations
  4. hasSideEffect determines whether an AST expression contains state mutations or function calls
  5. PatternMatcher finds all RegExp matches across target source strings and tracks match indices
  6. ReferenceTracker traverses global variable references and matches specified call and read access patterns

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • 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 pkg:npm/%40eslint-community/eslint-utils@4.10.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40eslint-community/eslint-utils@4.10.1
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - 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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      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
      "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": ">=0.10.0"
      }
    },
    "node_modules/yocto-queue": {
      "version": "0.1.0",
      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": ">=10"
      },
      "funding": {
        "url": "https://github.com/sponsors/sindresorhus"
      }
    }
  }
}
package.json
{
  "name": "sample-eslint-utils",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@eslint-community/eslint-utils": "4.10.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40eslint-community/eslint-utils@4.10.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40eslint-community/eslint-utils@4.10.1"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "runtime": "node@22.23.2"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const {
  getPropertyName,
  getStaticValue,
  getStringIfConstant,
  hasSideEffect,
  PatternMatcher,
  ReferenceTracker,
  CALL,
  READ,
  CONSTRUCT,
  ESM
} = require('@eslint-community/eslint-utils');

// 1. getPropertyName extracts static and computed property names from MemberExpression and Property AST nodes
{
  const staticMember = {
    type: 'MemberExpression',
    object: { type: 'Identifier', name: 'process' },
    property: { type: 'Identifier', name: 'env' },
    computed: false
  };
  assert.equal(getPropertyName(staticMember), 'env');

  const computedMember = {
    type: 'MemberExpression',
    object: { type: 'Identifier', name: 'config' },
    property: { type: 'Literal', value: 'port', raw: '"port"' },
    computed: true
  };
  assert.equal(getPropertyName(computedMember), 'port');

  const propNode = {
    type: 'Property',
    key: { type: 'Identifier', name: 'host' },
    value: { type: 'Literal', value: 'localhost' },
    kind: 'init',
    method: false,
    shorthand: false,
    computed: false
  };
  assert.equal(getPropertyName(propNode), 'host');
}

// 2. getStaticValue evaluates constant literal expressions, template literals, and binary operations to their static runtime values
{
  const literalNode = { type: 'Literal', value: 42, raw: '42' };
  assert.deepEqual(getStaticValue(literalNode), { value: 42 });

  const binaryNode = {
    type: 'BinaryExpression',
    operator: '+',
    left: { type: 'Literal', value: 100 },
    right: { type: 'Literal', value: 25 }
  };
  assert.deepEqual(getStaticValue(binaryNode), { value: 125 });

  const templateNode = {
    type: 'TemplateLiteral',
    quasis: [
      { type: 'TemplateElement', value: { cooked: 'hello ', raw: 'hello ' } },
      { type: 'TemplateElement', value: { cooked: 'world', raw: 'world' } }
    ],
    expressions: [{ type: 'Literal', value: 'there' }]
  };
  assert.deepEqual(getStaticValue(templateNode), { value: 'hello thereworld' });
}

// 3. getStringIfConstant converts constant literals or static template literals into string representations
{
  const strLit = { type: 'Literal', value: 'strict-mode', raw: '"strict-mode"' };
  assert.equal(getStringIfConstant(strLit), 'strict-mode');

  const numLit = { type: 'Literal', value: 123, raw: '123' };
  assert.equal(getStringIfConstant(numLit), '123');

  const dynamicIdent = { type: 'Identifier', name: 'dynamicVar' };
  assert.equal(getStringIfConstant(dynamicIdent), null);

  const staticTemplate = {
    type: 'TemplateLiteral',
    quasis: [{ type: 'TemplateElement', value: { cooked: 'constant-text', raw: 'constant-text' } }],
    expressions: []
  };
  assert.equal(getStringIfConstant(staticTemplate), 'constant-text');
}

// 4. hasSideEffect determines whether an AST expression contains state mutations or function calls
{
  const emptySourceCode = {};
  const pureNode = { type: 'Literal', value: 10 };
  assert.equal(hasSideEffect(pureNode, emptySourceCode), false);

  const callExpression = {
    type: 'CallExpression',
    callee: { type: 'Identifier', name: 'execute' },
    arguments: []
  };
  assert.equal(hasSideEffect(callExpression, emptySourceCode), true);

  const assignmentExpression = {
    type: 'AssignmentExpression',
    operator: '=',
    left: { type: 'Identifier', name: 'total' },
    right: { type: 'Literal', value: 0 }
  };
  assert.equal(hasSideEffect(assignmentExpression, emptySourceCode), true);
}

// 5. PatternMatcher finds all RegExp matches across target source strings and tracks match indices
{
  const matcher = new PatternMatcher(/item-(\d+)/g);
  const text = 'item-10 and item-20';
  const matches = Array.from(matcher.execAll(text));

  assert.equal(matches.length, 2);
  assert.equal(matches[0][0], 'item-10');
  assert.equal(matches[0][1], '10');
  assert.equal(matches[0].index, 0);

  assert.equal(matches[1][0], 'item-20');
  assert.equal(matches[1][1], '20');
  assert.equal(matches[1].index, 12);
}

// 6. ReferenceTracker traverses global variable references and matches specified call and read access patterns
{
  const mockGlobalScope = {
    set: new Map([
      [
        'fetch',
        {
          name: 'fetch',
          defs: [],
          references: [
            {
              identifier: { type: 'Identifier', name: 'fetch' },
              isRead: () => true,
              isWrite: () => false,
              init: false
            }
          ]
        }
      ]
    ])
  };

  const tracker = new ReferenceTracker(mockGlobalScope);
  const traceMap = {
    fetch: {
      [CALL]: true,
      [READ]: true
    }
  };

  const references = Array.from(tracker.iterateGlobalReferences(traceMap));
  assert.equal(references.length, 1);
  assert.equal(references[0].node.name, 'fetch');
  assert.deepEqual(references[0].path, ['fetch']);
  assert.equal(references[0].type, READ);
}

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

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