sass-lint/lib/rules/extends-before-mixins.js

Sass linter. Compatible but different from scss-lint

'use strict';

var helpers = require('../helpers');

module.exports = {
  'name': 'extends-before-mixins',
  'defaults': {},
  'detect': function (ast, parser) {
    var result = [];

    ast.traverseByType('block', function (block) {
      var lastMixin = null;
      block.traverse(function (item, j) {
        if (item.type === 'extend') {
          if (j > lastMixin && lastMixin !== null) {
            result = helpers.addUnique(result, {
              'ruleId': parser.rule.name,
              'line': item.start.line,
              'column': item.start.column,
              'message': 'Extends should come before mixins',
              'severity': parser.severity
            });
          }
        }
        if (item.type === 'include') {
          lastMixin = j;
        }
      });
      lastMixin = null;
    });

    return result;
  }
};