Imports Less hat mixins before your custom Less code.
Install..
requires Less v2.4.0
npm install -g less-plugin-lesshat
and then on the command line,
lessc file.less --lesshat
var LessPluginLesshat = require('less-plugin-less'),
LesshatPlugin = new LessPluginLesshat();
less.render(lessString, { plugins: [LesshatPlugin] })
.then(
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