Work with postcss-easings

[prn-feip]

Just tried to install both these packages:

• postcss-easings
• postcss-easing-gradients

Added both to .postcssrc.js:

module.exports = {
    plugins: ['postcss-easing-gradients', 'postcss-easings']
};

But this code is not processed:

background-image: linear-gradient(to right, black, ease-in-sine, transparent);

I tried to change order of plugins but it's not working too.