57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _postcss = require('postcss');
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var _postcss2 = _interopRequireDefault(_postcss);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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const OVERRIDABLE_RULES = ['keyframes', 'counter-style'];
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const SCOPE_RULES = ['media', 'supports'];
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function isOverridable(name) {
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return ~OVERRIDABLE_RULES.indexOf(_postcss2.default.vendor.unprefixed(name.toLowerCase()));
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}
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function isScope(name) {
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return ~SCOPE_RULES.indexOf(_postcss2.default.vendor.unprefixed(name.toLowerCase()));
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}
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function getScope(node) {
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let current = node.parent;
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const chain = [node.name.toLowerCase(), node.params];
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do {
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if (current.type === 'atrule' && isScope(current.name)) {
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chain.unshift(current.name + ' ' + current.params);
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}
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current = current.parent;
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} while (current);
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return chain.join('|');
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}
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exports.default = _postcss2.default.plugin('postcss-discard-overridden', () => {
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return css => {
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const cache = {};
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const rules = [];
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css.walkAtRules(node => {
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if (isOverridable(node.name)) {
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const scope = getScope(node);
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cache[scope] = node;
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rules.push({
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node,
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scope
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});
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}
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});
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rules.forEach(rule => {
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if (cache[rule.scope] !== rule.node) {
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rule.node.remove();
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}
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});
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};
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});
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module.exports = exports['default'];
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