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rOACCT/node_modules/csso/lib/restructure/2-initialMergeRuleset.js
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2-initialMergeRuleset.js
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			var walk = require('css-tree').walk;
			var utils = require('./utils');

			function processRule(node, item, list) {
			var selectors = node.prelude.children;
			var declarations = node.block.children;

			list.prevUntil(item.prev, function(prev) {
			// skip non-ruleset node if safe
			if (prev.type !== 'Rule') {
			return utils.unsafeToSkipNode.call(selectors, prev);
			}

			var prevSelectors = prev.prelude.children;
			var prevDeclarations = prev.block.children;

			// try to join rulesets with equal pseudo signature
			if (node.pseudoSignature === prev.pseudoSignature) {
			// try to join by selectors
			if (utils.isEqualSelectors(prevSelectors, selectors)) {
			prevDeclarations.appendList(declarations);
			list.remove(item);
			return true;
			}

			// try to join by declarations
			if (utils.isEqualDeclarations(declarations, prevDeclarations)) {
			utils.addSelectors(prevSelectors, selectors);
			list.remove(item);
			return true;
			}
			}

			// go to prev ruleset if has no selector similarities
			return utils.hasSimilarSelectors(selectors, prevSelectors);
			});
			}

			// NOTE: direction should be left to right, since rulesets merge to left
			// ruleset. When direction right to left unmerged rulesets may prevent lookup
			// TODO: remove initial merge
			module.exports = function initialMergeRule(ast) {
			walk(ast, {
			visit: 'Rule',
			enter: processRule
			});
			};