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aa446b7a9c
* chore: clean up ESLint config, enable a few rules * enable max-len for comments * fix build
48 lines
1.5 KiB
JavaScript
48 lines
1.5 KiB
JavaScript
/**
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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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/**
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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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* @returns {import('postcss').Plugin}
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*/
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module.exports = 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 (decl.parent.selector !== ':root') {
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return;
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}
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const sameProperties = decl.parent.nodes.filter(
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(n) => n.prop === decl.prop,
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);
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const hasImportantProperties = sameProperties.some((p) =>
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Object.prototype.hasOwnProperty.call(p, 'important'),
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);
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const overriddenProperties = hasImportantProperties
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? sameProperties.filter(
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(p) => !Object.prototype.hasOwnProperty.call(p, 'important'),
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)
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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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module.exports.postcss = true;
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