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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;