my-idlers/node_modules/clean-css/lib/optimizer/level-1/property-optimizers/background.js

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var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
var plugin = {
level1: {
property: function background(_rule, property, options) {
var values = property.value;
if (!options.level[OptimizationLevel.One].optimizeBackground) {
return;
}
if (values.length == 1 && values[0][1] == 'none') {
values[0][1] = '0 0';
}
if (values.length == 1 && values[0][1] == 'transparent') {
values[0][1] = '0 0';
}
}
}
};
module.exports = plugin;