72 lines
1.5 KiB
JavaScript
Executable file
72 lines
1.5 KiB
JavaScript
Executable file
"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; |