OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information
You probably want imagemin-optipng
instead.
$ npm install --save optipng-bin
const {promisify} = require('util'); const {execFile} = require('child_process'); const optipng = require('optipng-bin'); const execFileP = promsify(execFile); (async () => { await execFile(optipng, ['-out', 'output.png', 'input.png']); console.log('Image minified!'); })();
$ npm install --global optipng-bin
$ optipng --help