CodeSampleX

Sample

sharp 0.35.2: rotate an image with sharp

Verified sample for npm sharp 0.35.2: rotate an image with sharp. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:a48341f06a0d633312ebe82178c108e45744533ed09d1351b56db7772f217f9e

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
2
Signing keys that built it
1
Declared environment linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-20
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 SKIPPED compile:SKIPPED · contract:SKIPPED · load:SKIPPED · resolve:FAIL
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-08

Case

HOW
Goal
rotate an image with sharp
Packages
Symbols
  • sharp.rotate
Created
2026-08-20T03:49:32Z

Contract

  1. rotates an image buffer by 90 degrees swapping width and height dimensions
  2. rotates an image buffer by 180 degrees preserving width and height dimensions
  3. rotates an image buffer by 270 degrees swapping width and height dimensions

Files

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • 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: rotate an image with sharp
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/sharp@0.35.2
Demonstrate these symbols/APIs:
  - sharp.rotate

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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package.json
{
  "name": "sharp-rotate-sample",
  "version": "1.0.0",
  "type": "module",
  "description": "Rotate an image with sharp",
  "main": "src/index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "sharp": "0.35.2"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "rotate an image with sharp",
  "kind": "HOW",
  "packages": [
    "pkg:npm/sharp@0.35.2"
  ],
  "symbols": [
    "sharp.rotate"
  ]
}
src/index.mjs
import sharp from 'sharp';

/**
 * Rotates an input image buffer by the specified angle in degrees.
 * @param {Buffer|Uint8Array} inputBuffer - The image data buffer.
 * @param {number} [angle] - Angle of rotation in degrees (e.g. 90, 180, 270).
 * @param {object} [options] - Optional rotation configuration such as background color.
 * @returns {Promise<Buffer>} - The rotated image buffer.
 */
export async function rotateImage(inputBuffer, angle, options = {}) {
  return await sharp(inputBuffer)
    .rotate(angle, options)
    .toBuffer();
}
test/contract.mjs
import assert from 'node:assert/strict';
import sharp from 'sharp';
import { rotateImage } from '../src/index.mjs';

async function testContract() {
  // Create a 200x100 blank PNG image buffer offline
  const inputBuffer = await sharp({
    create: {
      width: 200,
      height: 100,
      channels: 4,
      background: { r: 0, g: 128, b: 255, alpha: 1 }
    }
  }).png().toBuffer();

  // Verify input image dimensions
  const inputMeta = await sharp(inputBuffer).metadata();
  assert.equal(inputMeta.width, 200, 'input width should be 200');
  assert.equal(inputMeta.height, 100, 'input height should be 100');

  // Test 90-degree rotation: dimensions should be swapped (100x200)
  const rotated90 = await rotateImage(inputBuffer, 90);
  const meta90 = await sharp(rotated90).metadata();
  assert.equal(meta90.width, 100, `expected width 100 after 90 deg rotation, got ${meta90.width}`);
  assert.equal(meta90.height, 200, `expected height 200 after 90 deg rotation, got ${meta90.height}`);
  assert.equal(meta90.format, 'png', 'expected format to be png');

  // Test 180-degree rotation: dimensions should remain 200x100
  const rotated180 = await rotateImage(inputBuffer, 180);
  const meta180 = await sharp(rotated180).metadata();
  assert.equal(meta180.width, 200, `expected width 200 after 180 deg rotation, got ${meta180.width}`);
  assert.equal(meta180.height, 100, `expected height 100 after 180 deg rotation, got ${meta180.height}`);

  // Test 270-degree rotation: dimensions should be swapped (100x200)
  const rotated270 = await rotateImage(inputBuffer, 270);
  const meta270 = await sharp(rotated270).metadata();
  assert.equal(meta270.width, 100, `expected width 100 after 270 deg rotation, got ${meta270.width}`);
  assert.equal(meta270.height, 200, `expected height 200 after 270 deg rotation, got ${meta270.height}`);

  console.log('Contract test passed: sharp image rotation verified');
}

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

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