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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
const OVERRIDABLE_RULES = ['keyframes', 'counter-style'];
const SCOPE_RULES = ['media', 'supports'];
function vendorUnprefixed(prop) {
return prop.replace(/^-\w+-/, '');
}
function isOverridable(name) {
return ~OVERRIDABLE_RULES.indexOf(vendorUnprefixed(name.toLowerCase()));
}
function isScope(name) {
return ~SCOPE_RULES.indexOf(vendorUnprefixed(name.toLowerCase()));
}
function getScope(node) {
let current = node.parent;
const chain = [node.name.toLowerCase(), node.params];
do {
if (current.type === 'atrule' && isScope(current.name)) {
chain.unshift(current.name + ' ' + current.params);
}
current = current.parent;
} while (current);
return chain.join('|');
}
function pluginCreator() {
return {
postcssPlugin: 'postcss-discard-overridden',
prepare() {
const cache = {};
const rules = [];
return {
OnceExit(css) {
css.walkAtRules(node => {
if (isOverridable(node.name)) {
const scope = getScope(node);
cache[scope] = node;
rules.push({
node,
scope
});
}
});
rules.forEach(rule => {
if (cache[rule.scope] !== rule.node) {
rule.node.remove();
}
});
}
};
}
};
}
pluginCreator.postcss = true;
var _default = pluginCreator;
exports.default = _default;
module.exports = exports.default;