1 | 'use strict';
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2 |
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3 | const mediaParser = require('postcss-media-query-parser').default;
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4 | const report = require('../../utils/report');
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5 | const ruleMessages = require('../../utils/ruleMessages');
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6 | const validateOptions = require('../../utils/validateOptions');
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7 | const valueParser = require('postcss-value-parser');
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8 |
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9 | const ruleName = 'no-duplicate-at-import-rules';
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10 |
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11 | const messages = ruleMessages(ruleName, {
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12 | rejected: (atImport) => `Unexpected duplicate @import rule ${atImport}`,
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13 | });
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14 |
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15 | function rule(actual) {
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16 | return (root, result) => {
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17 | const validOptions = validateOptions(result, ruleName, { actual });
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18 |
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19 | if (!validOptions) {
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20 | return;
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21 | }
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22 |
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23 | const imports = {};
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24 |
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25 | root.walkAtRules(/^import$/i, (atRule) => {
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26 | const params = valueParser(atRule.params).nodes;
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27 |
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28 | if (!params.length) {
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29 | return;
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30 | }
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31 |
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32 |
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33 | const uri =
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34 | params[0].type === 'function' && params[0].value === 'url'
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35 | ? params[0].nodes[0].value
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36 | : params[0].value;
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37 |
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38 | const media = mediaParser(valueParser.stringify(params.slice(1)))
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39 | .nodes.map((n) => n.value.replace(/\s/g, ''))
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40 | .filter((n) => n.length);
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41 |
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42 | const isDuplicate = media.length
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43 | ? imports[uri] && media.some((q) => imports[uri].includes(q))
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44 | : imports[uri];
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45 |
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46 | if (isDuplicate) {
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47 | report({
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48 | message: messages.rejected(uri),
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49 | node: atRule,
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50 | result,
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51 | ruleName,
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52 | });
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53 |
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54 | return;
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55 | }
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56 |
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57 | if (!imports[uri]) imports[uri] = [];
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58 |
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59 | imports[uri] = imports[uri].concat(media);
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60 | });
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61 | };
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62 | }
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63 |
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64 | rule.ruleName = ruleName;
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65 | rule.messages = messages;
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66 | module.exports = rule;
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