bare-stream 2.13.3

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/bare-stream@2.13.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/bare-stream@2.13.3
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:sha256:9ab20594840b6298e389db3d1916e44b0eb81de85b63fc1384da086f35c33304","constraints":{"executionContext":"node"},"contract":["Readable pushes string chunks converted to buffers and emits data and end events","Writable processes written chunks and invokes callback and finish event upon ending","Transform processes input chunks and pushes converted data downstream","PassThrough forwards data unmodified between writer and reader","duplexPair returns two linked Duplex streams for bidirectional communication","pipeline coordinates data flow through Readable, Transform, and Writable with completion callback","finished notifies when a stream has finished reading or writing","Stream emits error and close events when explicitly destroyed with an Error"],"goal":"verify pkg:npm/bare-stream@2.13.3","kind":"HOW","packages":["pkg:npm/bare-stream@2.13.3"],"schemaVersion":1},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"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/bare-stream@2.13.3"],"schemaVersion":1,"subject":"pkg:npm/bare-stream@2.13.3","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-bare-stream",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-bare-stream",
      "version": "1.0.0",
      "dependencies": {
        "bare-stream": "2.13.3"
      }
    },
    "node_modules/b4a": {
      "version": "1.8.1",
      "resolved": "https://registry.npmjs.org/b4a/-/b4a-1.8.1.tgz",
      "integrity": "sha512-aiqre1Nr0B/6DgE2N5vwTc+2/oQZ4Wh1t4NznYY4E00y8LCt6NqdRv81so00oo27D8MVKTpUa/MwUUtBLXCoDw==",
      "license": "Apache-2.0",
      "peerDependencies": {
        "react-native-b4a": "*"
      },
      "peerDependenciesMeta": {
        "react-native-b4a": {
          "optional": true
        }
      }
    },
    "node_modules/bare-events": {
      "version": "2.9.1",
      "resolved": "https://registry.npmjs.org/bare-events/-/bare-events-2.9.1.tgz",
      "integrity": "sha512-Z0oHEHAFDZkffN8Qc39zNZjQlMDkPJRyyyZieU1VH7u8c5S+qHZ2S8ixdKIAxEjfHO7FJxXmJWgteOghVanIsg==",
      "license": "Apache-2.0",
      "peerDependencies": {
        "bare-abort-controller": "*"
      },
      "peerDependenciesMeta": {
        "bare-abort-controller": {
          "optional": true
        }
      }
    },
    "node_modules/bare-stream": {
      "version": "2.13.3",
      "resolved": "https://registry.npmjs.org/bare-stream/-/bare-stream-2.13.3.tgz",
      "integrity": "sha512-Kc+brLqvEqGkjyfiwJmImAOqLZL7OsoLKuavx+hJjgVV3nLTOjloJyPMFxjUPerGGHrNH0fLU06jjykMLWrERQ==",
      "license": "Apache-2.0",
      "dependencies": {
        "b4a": "^1.8.1",
        "streamx": "^2.25.0",
        "teex": "^1.0.1"
      },
      "peerDependencies": {
        "bare-abort-controller": "*",
        "bare-buffer": "*",
        "bare-events": "*"
      },
      "peerDependenciesMeta": {
        "bare-abort-controller": {
          "optional": true
        },
        "bare-buffer": {
          "optional": true
        },
        "bare-events": {
          "optional": true
        }
      }
    },
    "node_modules/events-universal": {
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/events-universal/-/events-universal-1.0.1.tgz",
      "integrity": "sha512-LUd5euvbMLpwOF8m6ivPCbhQeSiYVNb8Vs0fQ8QjXo0JTkEHpz8pxdQf0gStltaPpw0Cca8b39KxvK9cfKRiAw==",
      "license": "Apache-2.0",
      "dependencies": {
        "bare-events": "^2.7.0"
      }
    },
    "node_modules/fast-fifo": {
      "version": "1.3.2",
      "resolved": "https://registry.npmjs.org/fast-fifo/-/fast-fifo-1.3.2.tgz",
      "integrity": "sha512-/d9sfos4yxzpwkDkuN7k2SqFKtYNmCTzgfEpz82x34IM9/zc8KGxQoXg1liNC/izpRM/MBdt44Nmx41ZWqk+FQ==",
      "license": "MIT"
    },
    "node_modules/streamx": {
      "version": "2.28.0",
      "resolved": "https://registry.npmjs.org/streamx/-/streamx-2.28.0.tgz",
      "integrity": "sha512-1Yowhzjf0ivGMrTIkY9hav5TxobO9qIVqUE41fiCGMGgc3CLlf4MY+9AHmZqBWgDTue0fY9zWjYFVyf6Diuobw==",
      "license": "MIT",
      "dependencies": {
        "events-universal": "^1.0.0",
        "fast-fifo": "^1.3.2",
        "text-decoder": "^1.1.0"
      }
    },
    "node_modules/teex": {
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/teex/-/teex-1.0.1.tgz",
      "integrity": "sha512-eYE6iEI62Ni1H8oIa7KlDU6uQBtqr4Eajni3wX7rpfXD8ysFx8z0+dri+KWEPWpBsxXfxu58x/0jvTVT1ekOSg==",
      "license": "MIT",
      "dependencies": {
        "streamx": "^2.12.5"
      }
    },
    "node_modules/text-decoder": {
      "version": "1.2.7",
      "resolved": "https://registry.npmjs.org/text-decoder/-/text-decoder-1.2.7.tgz",
      "integrity": "sha512-vlLytXkeP4xvEq2otHeJfSQIRyWxo/oZGEbXrtEEF9Hnmrdly59sUbzZ/QgyWuLYHctCHxFF4tRQZNQ9k60ExQ==",
      "license": "Apache-2.0",
      "dependencies": {
        "b4a": "^1.6.4"
      }
    }
  }
}

{
  "name": "sample-bare-stream",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "bare-stream": "2.13.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/bare-stream@2.13.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/bare-stream@2.13.3"
  ],
  "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 Stream, {
  Readable,
  Writable,
  Duplex,
  Transform,
  PassThrough,
  pipeline,
  duplexPair,
  finished,
  isStream,
  isReadable,
  isWritable,
  isEnded,
  isFinished
} from 'bare-stream';

// 1. Readable pushes string chunks converted to buffers and emits data and end events
await new Promise((resolve, reject) => {
  const chunks = [];
  let index = 0;
  const items = ['chunk1', 'chunk2'];
  const readable = new Readable({
    read() {
      if (index < items.length) {
        this.push(items[index++]);
      } else {
        this.push(null);
      }
    }
  });

  assert.equal(isStream(readable), true);
  assert.equal(isReadable(readable), true);

  readable.on('data', (chunk) => {
    chunks.push(chunk.toString());
  });

  readable.on('end', () => {
    try {
      assert.deepEqual(chunks, ['chunk1', 'chunk2']);
      assert.equal(isEnded(readable), true);
      resolve();
    } catch (err) {
      reject(err);
    }
  });

  readable.on('error', reject);
});

// 2. Writable processes written chunks and invokes callback and finish event upon ending
await new Promise((resolve, reject) => {
  const received = [];
  const writable = new Writable({
    write(chunk, encoding, cb) {
      received.push(chunk.toString());
      cb(null);
    }
  });

  assert.equal(isStream(writable), true);
  assert.equal(isWritable(writable), true);

  writable.on('finish', () => {
    try {
      assert.deepEqual(received, ['hello', 'world']);
      assert.equal(isFinished(writable), true);
      resolve();
    } catch (err) {
      reject(err);
    }
  });

  writable.on('error', reject);

  writable.write('hello');
  writable.end('world');
});

// 3. Transform processes input chunks and pushes converted data downstream
await new Promise((resolve, reject) => {
  const transformed = [];
  const tr = new Transform({
    transform(chunk, encoding, cb) {
      this.push(chunk.toString().toUpperCase());
      cb(null);
    }
  });

  tr.on('data', (chunk) => {
    transformed.push(chunk.toString());
  });

  tr.on('end', () => {
    try {
      assert.deepEqual(transformed, ['FOO', 'BAR']);
      resolve();
    } catch (err) {
      reject(err);
    }
  });

  tr.on('error', reject);

  tr.write('foo');
  tr.end('bar');
});

// 4. PassThrough forwards data unmodified between writer and reader
await new Promise((resolve, reject) => {
  const pass = new PassThrough();
  const chunks = [];

  pass.on('data', (chunk) => {
    chunks.push(chunk.toString());
  });

  pass.on('end', () => {
    try {
      assert.deepEqual(chunks, ['alpha', 'beta']);
      resolve();
    } catch (err) {
      reject(err);
    }
  });

  pass.on('error', reject);

  pass.write('alpha');
  pass.end('beta');
});

// 5. duplexPair returns two linked Duplex streams for bidirectional communication
await new Promise((resolve, reject) => {
  const [sideA, sideB] = duplexPair();
  const sideBReceived = [];
  const sideAReceived = [];

  sideB.on('data', (chunk) => {
    sideBReceived.push(chunk.toString());
  });

  sideA.on('data', (chunk) => {
    sideAReceived.push(chunk.toString());
  });

  let endedA = false;
  let endedB = false;
  function checkDone() {
    if (endedA && endedB) {
      try {
        assert.deepEqual(sideBReceived, ['msg-from-a']);
        assert.deepEqual(sideAReceived, ['msg-from-b']);
        resolve();
      } catch (e) {
        reject(e);
      }
    }
  }

  sideB.on('end', () => {
    endedB = true;
    checkDone();
  });

  sideA.on('end', () => {
    endedA = true;
    checkDone();
  });

  sideA.write('msg-from-a');
  sideA.end();

  sideB.write('msg-from-b');
  sideB.end();
});

// 6. pipeline coordinates data flow through Readable, Transform, and Writable with completion callback
await new Promise((resolve, reject) => {
  let index = 0;
  const items = ['cat', 'dog'];
  const src = new Readable({
    read() {
      if (index < items.length) {
        this.push(items[index++]);
      } else {
        this.push(null);
      }
    }
  });

  const tr = new Transform({
    transform(chunk, encoding, cb) {
      this.push(chunk.toString() + '!');
      cb(null);
    }
  });

  const destResult = [];
  const dest = new Writable({
    write(chunk, encoding, cb) {
      destResult.push(chunk.toString());
      cb(null);
    }
  });

  pipeline(src, tr, dest, (err) => {
    if (err) return reject(err);
    try {
      assert.deepEqual(destResult, ['cat!', 'dog!']);
      resolve();
    } catch (err) {
      reject(err);
    }
  });
});

// 7. finished notifies when a stream has finished reading or writing
await new Promise((resolve, reject) => {
  let pushed = false;
  const readable = new Readable({
    read() {
      if (!pushed) {
        pushed = true;
        this.push('data');
      } else {
        this.push(null);
      }
    }
  });

  finished(readable, (err) => {
    if (err) return reject(err);
    resolve();
  });

  readable.resume();
});

// 8. Stream emits error and close events when explicitly destroyed with an Error
await new Promise((resolve, reject) => {
  const readable = new Readable({
    read() {
      this.push('test');
    }
  });

  let errorEmitted = false;
  readable.on('error', (err) => {
    if (err.message === 'stream exploded') {
      errorEmitted = true;
    }
  });

  readable.on('close', () => {
    try {
      assert.equal(errorEmitted, true);
      assert.equal(readable.destroyed, true);
      resolve();
    } catch (e) {
      reject(e);
    }
  });

  readable.destroy(new Error('stream exploded'));
});