jest-util 30.4.1: invariant

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 jest-util.invariant in pkg:npm/jest-util@30.4.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/jest-util@30.4.1
Demonstrate these symbols/APIs:
  - jest-util.invariant

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-jest-util-invariant",
  "version": "1.0.0",
  "description": "Clean-room verification sample for jest-util invariant",
  "type": "module",
  "private": true,
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "jest-util": "30.4.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify jest-util.invariant in pkg:npm/jest-util@30.4.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/jest-util@30.4.1"
  ],
  "symbols": [
    "jest-util.invariant"
  ]
}

import assert from 'node:assert/strict';
import { invariant } from 'jest-util';

// 1. invariant does not throw when condition is truthy boolean true
{
  assert.doesNotThrow(() => {
    invariant(true);
    invariant(true, 'should not throw');
  });
}

// 2. invariant does not throw when condition is truthy non-boolean values
{
  assert.doesNotThrow(() => {
    invariant('non-empty string');
    invariant(123);
    invariant(-1);
    invariant({});
    invariant([]);
    invariant(() => {});
    invariant(Symbol('ok'));
  });
}

// 3. invariant throws Error when condition is boolean false
{
  assert.throws(() => {
    invariant(false);
  }, {
    name: 'Error'
  });
}

// 4. invariant throws Error when condition is falsy values
{
  const falsyValues = [null, undefined, 0, -0, 0n, NaN, ''];
  for (const val of falsyValues) {
    assert.throws(() => {
      invariant(val);
    }, {
      name: 'Error'
    });
  }
}

// 5. invariant throws Error with the specified custom message
{
  const message = 'Invariant violation: expected user to be authenticated';
  assert.throws(() => {
    invariant(false, message);
  }, {
    name: 'Error',
    message: message
  });
}

// 6. invariant throws Error with empty string message when message argument is omitted
{
  assert.throws(() => {
    invariant(false);
  }, {
    name: 'Error',
    message: ''
  });
}

// 7. invariant returns undefined on success
{
  const result = invariant(true, 'success');
  assert.strictEqual(result, undefined);
}

console.log('All invariant contract assertions passed.');