zopflipng

zopflipng is a native addon module of google's zopflipng.

Warning

Curently this package can only run on unix-like systems

Warning

Currently this package doesn't use pre-built binaries. It builds addon from source code while package is installed. Compilation process uses Cmake, Make or Ninja and GCC so these binaries should be in the path.

Install

npm install zopflipng

Example

npm install pngjs

import fs from "fs/promises";
import { optimize } from "zopflipng";

const pngContent = await fs.readFile(
  "node_modules/pngquantjs/assets/nodejs.png"
);
const options = {
  verbose: true,
  lossy_transparent: false,
  lossy_8bit: false,
  filter_strategies: [],
  auto_filter_strategy: true,
  keep_colortype: false,
  keepchunks: [],
  use_zopfli: true,
  num_iterations: 15,
  num_iterations_large: 5,
};
optimize(pngContent, options);

Contribution

Development

git clone https://github.com/diodeiot/zopflipng --recursive
cd zopflipng
yarn
yarn build

When contributing code, please write relevant tests and run npm test before submitting pull requests.

License

MIT