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 | | var walk = require('css-tree').walk; |  | var handlers = { |  |     Atrule: require('./Atrule'), |  |     Comment: require('./Comment'), |  |     Declaration: require('./Declaration'), |  |     Raw: require('./Raw'), |  |     Rule: require('./Rule'), |  |     TypeSelector: require('./TypeSelector'), |  |     WhiteSpace: require('./WhiteSpace') |  | }; |  |   |  | module.exports = function(ast, options) { |  |     walk(ast, { |  |         leave: function(node, item, list) { |  |             if (handlers.hasOwnProperty(node.type)) { |  |                 handlers[node.type].call(this, node, item, list, options); |  |             } |  |         } |  |     }); |  | }; | 
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