check-error 2.1.3

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/check-error@2.1.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/check-error@2.1.3

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:sha256:186357eff31284db85020ef94caf762d4414d505f9fcd98be50e5a06ccdc8e71","contract":["compatibleInstance returns true when thrown error strictly equals errorLike instance and false otherwise","compatibleConstructor matches errors by constructor function or instance inheritance","compatibleMessage verifies error messages using string substring or regular expression matching","getMessage extracts message string from Error instances or string values","getConstructorName retrieves the constructor name from error instances and constructor functions"],"goal":"verify pkg:npm/check-error@2.1.3","kind":"HOW","packages":["pkg:npm/check-error@2.1.3"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/check-error@2.1.3"],"schemaVersion":1,"subject":"pkg:npm/check-error@2.1.3","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-check-error",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-check-error",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "check-error": "2.1.3"
      }
    },
    "node_modules/check-error": {
      "version": "2.1.3",
      "resolved": "https://registry.npmjs.org/check-error/-/check-error-2.1.3.tgz",
      "integrity": "sha512-PAJdDJusoxnwm1VwW07VWwUN1sl7smmC3OKggvndJFadxxDRyFJBX/ggnu/KE4kQAB7a3Dp8f/YXC1FlUprWmA==",
      "license": "MIT",
      "engines": {
        "node": ">= 16"
      }
    }
  }
}

{
  "name": "sample-check-error",
  "version": "1.0.0",
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "check-error": "2.1.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/check-error@2.1.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/check-error@2.1.3"
  ]
}

import assert from 'node:assert/strict';
import {
  compatibleInstance,
  compatibleConstructor,
  compatibleMessage,
  getMessage,
  getConstructorName
} from 'check-error';

// 1. compatibleInstance returns true when thrown error strictly equals errorLike instance and false otherwise
const err1 = new Error('test error');
const err2 = new Error('test error');
assert.equal(compatibleInstance(err1, err1), true);
assert.equal(compatibleInstance(err1, err2), false);
assert.equal(compatibleInstance(err1, null), false);
assert.equal(compatibleInstance(err1, 'test error'), false);
assert.equal(compatibleInstance(err1, Error), false);

// 2. compatibleConstructor matches errors by constructor function or instance inheritance
class CustomError extends Error {}
const customErr = new CustomError('custom failure');
const typeErr = new TypeError('type failure');

assert.equal(compatibleConstructor(err1, Error), true);
assert.equal(compatibleConstructor(typeErr, TypeError), true);
assert.equal(compatibleConstructor(typeErr, Error), true);
assert.equal(compatibleConstructor(customErr, CustomError), true);
assert.equal(compatibleConstructor(customErr, Error), true);
assert.equal(compatibleConstructor(customErr, err1), true);
assert.equal(compatibleConstructor(err1, customErr), false);
assert.equal(compatibleConstructor(err1, TypeError), false);
assert.equal(compatibleConstructor(err1, {}), false);

// 3. compatibleMessage verifies error messages using string substring or regular expression matching
const msgErr = new Error('Failed to connect to host: 127.0.0.1');
assert.equal(compatibleMessage(msgErr, 'Failed to connect'), true);
assert.equal(compatibleMessage(msgErr, '127.0.0.1'), true);
assert.equal(compatibleMessage(msgErr, 'database error'), false);
assert.equal(compatibleMessage(msgErr, /^Failed to connect/), true);
assert.equal(compatibleMessage(msgErr, /host: \d+\.\d+\.\d+\.\d+/), true);
assert.equal(compatibleMessage(msgErr, /^database/), false);
assert.equal(compatibleMessage('raw string error', 'string error'), true);
assert.equal(compatibleMessage('raw string error', /^raw/), true);

// 4. getMessage extracts message string from Error instances or string values
assert.equal(getMessage(new Error('something went wrong')), 'something went wrong');
assert.equal(getMessage('direct error message'), 'direct error message');
assert.equal(getMessage(new Error()), '');
assert.equal(getMessage(null), '');
assert.equal(getMessage(undefined), '');

// 5. getConstructorName retrieves the constructor name from error instances and constructor functions
assert.equal(getConstructorName(new TypeError('type')), 'TypeError');
assert.equal(getConstructorName(new RangeError('range')), 'RangeError');
assert.equal(getConstructorName(TypeError), 'TypeError');
assert.equal(getConstructorName(customErr), 'CustomError');
assert.equal(getConstructorName(CustomError), 'CustomError');