PNG or JPG?

[marob]

When succss creates ".png" files, it is in fact JPGs!

A file theFile.png command tells: JPEG image data, JFIF standard 1.01

[FDiskas]

Succss.options = {
    imgType: 'png',
    imgQuality: 100,
...

npm install optipng --save-dev
add script to package.json

"optimize": "./node_modules/.bin/optipng css_test/img/*"

And this will be png at the result.