postcss-merge-longhand

Merge longhand properties into shorthand with PostCSS.

Install

With npm do:

npm install postcss-merge-longhand --save

Merge longhand properties into shorthand; works with margin, padding &
border. For more examples see the tests.

h1 {
    margin-top: 10px;
    margin-right: 20px;
    margin-bottom: 10px;
    margin-left: 20px;
}

h1 {
    margin: 10px 20px;
}

See the PostCSS documentation for
examples for your environment.