pngquant

import PngQuant from 'pngquant'; import { createReadStream, createWriteStream, promises as fsPromises } from 'fs'; import { pipeline } from 'stream/promises'; import path from 'path'; // Ensure a dummy input.png exists for this example to run. // In a real application, 'input.png' would be provided by user upload or file system. const inputFilePath = path.resolve(__dirname, 'input.png'); const outputFilePath = path.resolve(__dirname, 'output.png'); async function createDummyPng() { const dummyPngContent = Buffer.from('iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=', 'base64'); await fsPromises.writeFile(inputFilePath, dummyPngContent); console.log(`Created dummy PNG at ${inputFilePath}`); } async function optimizeImage() { await createDummyPng(); // Create a dummy PNG for the example try { // Initialize PngQuant with specific command-line arguments for the pngquant binary. // Here: reduce to 192 colors, target quality 60-80, disable dithering, read from stdin ('-'). const myPngQuanter = new PngQuant([192, '--quality', '60-80', '--nofs', '-']); console.log(`Optimizing ${inputFilePath} to ${outputFilePath}...`); await pipeline( createReadStream(inputFilePath), // Source stream: reads the input PNG myPngQuanter, // Transform stream: optimizes the PNG createWriteStream(outputFilePath) // Destination stream: writes the optimized PNG ); console.log(`Optimization complete! Optimized PNG saved to ${outputFilePath}`); } catch (error) { console.error('Image optimization failed:', error); } finally { // Clean up the dummy file await fsPromises.unlink(inputFilePath).catch(() => {}); } } optimizeImage();