/
index.js
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/
index.js
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'use strict';
const eachDeclarationBlock = require('../../utils/eachDeclarationBlock');
const isCustomProperty = require('../../utils/isCustomProperty');
const isStandardSyntaxProperty = require('../../utils/isStandardSyntaxProperty');
const optionsMatches = require('../../utils/optionsMatches');
const report = require('../../utils/report');
const ruleMessages = require('../../utils/ruleMessages');
const validateOptions = require('../../utils/validateOptions');
const { isString } = require('../../utils/validateTypes');
const vendor = require('../../utils/vendor');
const ruleName = 'declaration-block-no-duplicate-properties';
const messages = ruleMessages(ruleName, {
rejected: (property) => `Unexpected duplicate "${property}"`,
});
const meta = {
url: 'https://stylelint.io/user-guide/rules/list/declaration-block-no-duplicate-properties',
};
/** @type {import('stylelint').Rule} */
const rule = (primary, secondaryOptions) => {
return (root, result) => {
const validOptions = validateOptions(
result,
ruleName,
{ actual: primary },
{
actual: secondaryOptions,
possible: {
ignore: [
'consecutive-duplicates',
'consecutive-duplicates-with-different-values',
'consecutive-duplicates-with-same-prefixless-values',
],
ignoreProperties: [isString],
},
optional: true,
},
);
if (!validOptions) {
return;
}
const ignoreDuplicates = optionsMatches(secondaryOptions, 'ignore', 'consecutive-duplicates');
const ignoreDiffValues = optionsMatches(
secondaryOptions,
'ignore',
'consecutive-duplicates-with-different-values',
);
const ignorePrefixlessSameValues = optionsMatches(
secondaryOptions,
'ignore',
'consecutive-duplicates-with-same-prefixless-values',
);
eachDeclarationBlock(root, (eachDecl) => {
/** @type {string[]} */
const decls = [];
/** @type {string[]} */
const values = [];
eachDecl((decl) => {
const prop = decl.prop;
const value = decl.value;
if (!isStandardSyntaxProperty(prop)) {
return;
}
if (isCustomProperty(prop)) {
return;
}
// Return early if the property is to be ignored
if (optionsMatches(secondaryOptions, 'ignoreProperties', prop)) {
return;
}
// Ignore the src property as commonly duplicated in at-fontface
if (prop.toLowerCase() === 'src') {
return;
}
const indexDuplicate = decls.indexOf(prop.toLowerCase());
if (indexDuplicate !== -1) {
if (ignoreDiffValues || ignorePrefixlessSameValues) {
// fails if duplicates are not consecutive
if (indexDuplicate !== decls.length - 1) {
report({
message: messages.rejected(prop),
node: decl,
result,
ruleName,
});
return;
}
const duplicateValue = values[indexDuplicate] || '';
if (ignorePrefixlessSameValues) {
// fails if values of consecutive, unprefixed duplicates are equal
if (vendor.unprefixed(value) !== vendor.unprefixed(duplicateValue)) {
report({
message: messages.rejected(prop),
node: decl,
result,
ruleName,
});
return;
}
}
// fails if values of consecutive duplicates are equal
if (value === duplicateValue) {
report({
message: messages.rejected(prop),
node: decl,
result,
ruleName,
});
return;
}
return;
}
if (ignoreDuplicates && indexDuplicate === decls.length - 1) {
return;
}
report({
message: messages.rejected(prop),
node: decl,
result,
ruleName,
});
}
decls.push(prop.toLowerCase());
values.push(value.toLowerCase());
});
});
};
};
rule.ruleName = ruleName;
rule.messages = messages;
rule.meta = meta;
module.exports = rule;