sharp 0.35.2: rotate an image with sharp

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.

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{
  "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"
  }
}

{
  "schemaVersion": 1,
  "goal": "rotate an image with sharp",
  "kind": "HOW",
  "packages": [
    "pkg:npm/sharp@0.35.2"
  ],
  "symbols": [
    "sharp.rotate"
  ]
}

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();
}

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);
});