postcss-gradientfixer
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PostCSS plugin to rewrite CSS gradients code with existing vendor prefixes
PostCSS gradientfixer 
PostCSS plugin to rewrite code with existing vendor prefixes (especially -webkit-) on CSS gradients and add equivalent un-prefixed CSS.
For example, here's some CSS with vendor-specific prefix and a gradient syntax based on older versions of the CSS specifications:
.foo {
background: -webkit-gradient(linear, left top, left bottom, color-stop(0, #ffffff), to(#f0efe7));
}
The unprefixer plugin will add the equivalent standard declarations (while leaving the old CSS for backwards compatibility with older WebKit-based browsers):
.foo {
background: -webkit-gradient(linear, left top, left bottom, color-stop(0, #ffffff), to(#f0efe7));
background: linear-gradient(to bottom, #ffffff 0%, #f0efe7 100%);
}
Usage
postcss([ require('postcss-gradientfixer') ])
See PostCSS docs for examples for your environment.