"use strict";
/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
Object.defineProperty(exports, "__esModule", { value: true });
const isRule = (node) => node?.type === 'rule';
/**
 * This PostCSS plugin will remove duplicate/same custom properties (which are
 * actually overridden ones) **only** from `:root` selector.
 *
 * Depending on the presence of an `!important` rule in value of custom
 * property, the following actions will happen:
 *
 * - If the same custom properties do **not** have an `!important` rule, then
 * all of them will be removed except for the last one (which will actually be
 * applied).
 * - If the same custom properties have at least one `!important` rule, then
 * only those properties that do not have this rule will be removed.
 */
function creator() {
    return {
        postcssPlugin: 'postcss-remove-overridden-custom-properties',
        Declaration(decl) {
            if (!isRule(decl.parent) || decl.parent.selector !== ':root') {
                return;
            }
            const sameProperties = decl.parent.nodes.filter((n) => 'prop' in n && n.prop === decl.prop);
            const hasImportantProperties = sameProperties.some((p) => 'important' in p);
            const overriddenProperties = hasImportantProperties
                ? sameProperties.filter((p) => !('important' in p))
                : sameProperties.slice(0, -1);
            overriddenProperties.map((p) => p.remove());
        },
    };
}
creator.postcss = true;
exports.default = creator;