unpipe 1.0.0

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/unpipe@1.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/unpipe@1.0.0

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:c09433db90162206dcb98ec207cee8e93a13de614c35ef11810b644b9cc964ab","contract":["unpipe(stream) throws TypeError when argument stream is missing or null","unpipe(stream) calls stream.unpipe() to detach stream from its destination","unpipe(stream) stops data flow between readable stream and destination writable stream","unpipe(stream) disconnects readable stream from multiple destination streams simultaneously","unpipe(stream) safely handles stream objects without unpipe method"],"goal":"verify pkg:npm/unpipe@1.0.0","kind":"HOW","packages":["pkg:npm/unpipe@1.0.0"],"schemaVersion":1},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/unpipe@1.0.0"],"schemaVersion":1,"verifierAdapter":"node-typescript@1"}

{
  "name": "csx-sample-unpipe",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "csx-sample-unpipe",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "unpipe": "1.0.0"
      }
    },
    "node_modules/unpipe": {
      "version": "1.0.0",
      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.8"
      }
    }
  }
}

{
  "name": "csx-sample-unpipe",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification for unpipe",
  "main": "test/contract.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "unpipe": "1.0.0"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/unpipe@1.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/unpipe@1.0.0"
  ]
}

const assert = require('assert');
const { PassThrough } = require('stream');
const unpipe = require('unpipe');

async function runTests() {
  // Test 1: unpipe(stream) throws TypeError when argument stream is missing or null
  {
    assert.throws(
      () => unpipe(),
      /^TypeError: argument stream is required$/,
      'unpipe() without arguments should throw TypeError'
    );
    assert.throws(
      () => unpipe(null),
      /^TypeError: argument stream is required$/,
      'unpipe(null) should throw TypeError'
    );
    assert.throws(
      () => unpipe(undefined),
      /^TypeError: argument stream is required$/,
      'unpipe(undefined) should throw TypeError'
    );
  }

  // Test 2: unpipe(stream) calls stream.unpipe() to detach stream from its destination
  {
    let unpipeCalled = false;
    const fakeStream = {
      unpipe() {
        unpipeCalled = true;
      }
    };
    unpipe(fakeStream);
    assert.strictEqual(unpipeCalled, true, 'unpipe should invoke stream.unpipe()');
  }

  // Test 3: unpipe(stream) stops data flow between readable stream and destination writable stream
  await new Promise((resolve, reject) => {
    const src = new PassThrough();
    const dest = new PassThrough();

    const receivedChunks = [];
    dest.on('data', (chunk) => {
      receivedChunks.push(chunk.toString());
    });

    src.pipe(dest);
    src.write('first-chunk');

    // Unpipe source from destination
    unpipe(src);

    src.write('second-chunk');
    src.end();

    setImmediate(() => {
      try {
        assert.deepStrictEqual(receivedChunks, ['first-chunk'], 'destination should not receive data after unpipe');
        resolve();
      } catch (err) {
        reject(err);
      }
    });
  });

  // Test 4: unpipe(stream) disconnects readable stream from multiple destination streams simultaneously
  await new Promise((resolve, reject) => {
    const src = new PassThrough();
    const dest1 = new PassThrough();
    const dest2 = new PassThrough();

    const chunks1 = [];
    const chunks2 = [];

    dest1.on('data', (chunk) => chunks1.push(chunk.toString()));
    dest2.on('data', (chunk) => chunks2.push(chunk.toString()));

    src.pipe(dest1);
    src.pipe(dest2);

    src.write('initial-data');

    unpipe(src);

    src.write('subsequent-data');
    src.end();

    setImmediate(() => {
      try {
        assert.deepStrictEqual(chunks1, ['initial-data'], 'dest1 should only receive initial data');
        assert.deepStrictEqual(chunks2, ['initial-data'], 'dest2 should only receive initial data');
        resolve();
      } catch (err) {
        reject(err);
      }
    });
  });

  // Test 5: unpipe(stream) safely handles stream objects without unpipe method
  {
    const noUnpipeStream = {
      listeners(event) {
        return [];
      }
    };
    assert.doesNotThrow(() => {
      unpipe(noUnpipeStream);
    }, 'unpipe should safely handle stream without unpipe method');
  }

  console.log('All unpipe contract assertions passed successfully.');
}

runTests().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});