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