1 | "use strict";
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.default = void 0;
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7 | const OVERRIDABLE_RULES = ['keyframes', 'counter-style'];
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8 | const SCOPE_RULES = ['media', 'supports'];
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9 |
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10 | function vendorUnprefixed(prop) {
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11 | return prop.replace(/^-\w+-/, '');
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12 | }
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13 |
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14 | function isOverridable(name) {
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15 | return ~OVERRIDABLE_RULES.indexOf(vendorUnprefixed(name.toLowerCase()));
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16 | }
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17 |
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18 | function isScope(name) {
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19 | return ~SCOPE_RULES.indexOf(vendorUnprefixed(name.toLowerCase()));
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20 | }
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21 |
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22 | function getScope(node) {
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23 | let current = node.parent;
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24 | const chain = [node.name.toLowerCase(), node.params];
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25 |
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26 | do {
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27 | if (current.type === 'atrule' && isScope(current.name)) {
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28 | chain.unshift(current.name + ' ' + current.params);
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29 | }
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30 |
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31 | current = current.parent;
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32 | } while (current);
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33 |
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34 | return chain.join('|');
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35 | }
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36 |
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37 | function pluginCreator() {
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38 | return {
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39 | postcssPlugin: 'postcss-discard-overridden',
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40 |
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41 | prepare() {
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42 | const cache = {};
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43 | const rules = [];
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44 | return {
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45 | OnceExit(css) {
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46 | css.walkAtRules(node => {
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47 | if (isOverridable(node.name)) {
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48 | const scope = getScope(node);
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49 | cache[scope] = node;
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50 | rules.push({
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51 | node,
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52 | scope
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53 | });
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54 | }
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55 | });
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56 | rules.forEach(rule => {
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57 | if (cache[rule.scope] !== rule.node) {
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58 | rule.node.remove();
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59 | }
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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 | }
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65 |
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66 | };
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67 | }
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68 |
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69 | pluginCreator.postcss = true;
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70 | var _default = pluginCreator;
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71 | exports.default = _default;
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72 | module.exports = exports.default; |
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