text: 'use strict';
  
  const declarationValueIndex = require('../../utils/declarationValueIndex');
  const isStandardSyntaxFunction = require('../../utils/isStandardSyntaxFunction');
  const matchesStringOrRegExp = require('../../utils/matchesStringOrRegExp');
  const report = require('../../utils/report');
  const ruleMessages = require('../../utils/ruleMessages');
  const validateOptions = require('../../utils/validateOptions');
  const valueParser = require('postcss-value-parser');
  const vendor = require('../../utils/vendor');
  const { isRegExp, isString } = require('../../utils/validateTypes');
  
  const ruleName = 'function-allowed-list';
  
  const messages = ruleMessages(ruleName, {
  	rejected: (name) => `Unexpected function "${name}"`,
  });
  
  const meta = {
  	url: 'https://stylelint.io/user-guide/rules/list/function-allowed-list',
  };
  
  /** @type {import('stylelint').Rule<string | RegExp | Array<string | RegExp>>} */
  const rule = (primary) => {
  	return (root, result) => {
  		const validOptions = validateOptions(result, ruleName, {
  			actual: primary,
  			possible: [isString, isRegExp],
  		});
  
  		if (!validOptions) {
  			return;
  		}
  
  		root.walkDecls((decl) => {
  			valueParser(decl.value).walk((node) => {
  				if (node.type !== 'function') {
  					return;
  				}
  
  				if (!isStandardSyntaxFunction(node)) {
  					return;
  				}
  
  				if (matchesStringOrRegExp(vendor.unprefixed(node.value), primary)) {
  					return;
  				}
  
  				const index = declarationValueIndex(decl) + node.sourceIndex;
  				const endIndex = index + node.value.length;
  
  				report({
  					message: messages.rejected(node.value),
  					node: decl,
  					index,
  					endIndex,
  					result,
  					ruleName,
  				});
  			});
  		});
  	};
  };
  
  rule.primaryOptionArray = true;
  
  rule.ruleName = ruleName;
  rule.messages = messages;
  rule.meta = meta;
  module.exports = rule;
  