How to use the optipng-bin.stream function in optipng-bin
To help you get started, we’ve selected a few optipng-bin examples, based on popular ways it is used in public projects.
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imagemin / imagemin / index.js View on Github 
Imagemin.prototype._optimizePng = function () {
var args = ['-strip', 'all', '-quiet'];
var optipng = require('optipng-bin').stream;
var pngquant;
if (typeof this.optimizationLevel === 'number') {
args.push('-o', this.optimizationLevel);
}
if (this.opts.pngquant) {
pngquant = require('pngquant-bin').path;
return spawn(optipng, args).stdout.pipe(spawn(pngquant, ['-']));
}
return spawn(optipng, args);
};optipng-bin
OptiPNG wrapper that makes it seamlessly available as a local dependency
