stylelint/lib/rules/no-invalid-position-declaration/index.mjs

A mighty CSS linter that helps you avoid errors and enforce conventions.

import { isAtRule, isRule } from '../../utils/typeGuards.mjs';
import findNodeUpToRoot from '../../utils/findNodeUpToRoot.mjs';
import isStandardSyntaxDeclaration from '../../utils/isStandardSyntaxDeclaration.mjs';
import { nestingSupportedAtKeywords } from '../../reference/atKeywords.mjs';
import report from '../../utils/report.mjs';
import ruleMessages from '../../utils/ruleMessages.mjs';
import validateOptions from '../../utils/validateOptions.mjs';

const ruleName = 'no-invalid-position-declaration';

const messages = ruleMessages(ruleName, {
	rejected: 'Unexpected invalid position declaration',
});

const meta = {
	url: 'https://stylelint.io/user-guide/rules/no-invalid-position-declaration',
};

/** @type {import('stylelint').CoreRules[ruleName]} */
const rule = (primary) => {
	return (root, result) => {
		const validOptions = validateOptions(result, ruleName, { actual: primary });

		if (!validOptions) return;

		root.walkDecls((decl) => {
			if (!isStandardSyntaxDeclaration(decl)) return;

			const { parent } = decl;

			if (!parent) return;

			// Declarations are allowed in rules
			if (isRule(parent)) return;

			if (isAtRule(parent)) {
				const atRuleName = parent.name.toLowerCase();

				// Nesting-supported at-rules only allow declarations when nested inside a rule
				if (nestingSupportedAtKeywords.has(atRuleName)) {
					const parentRule = findNodeUpToRoot(decl, ({ type }) => type === 'rule');

					if (parentRule) return;
				} else {
					return;
				}
			}

			report({
				message: messages.rejected,
				messageArgs: [],
				node: decl,
				result,
				ruleName,
			});
		});
	};
};

rule.ruleName = ruleName;
rule.messages = messages;
rule.meta = meta;
export default rule;