stylelint/src/utils/ruleMessages.js

Modern CSS linter

/**
 * Given an object of violation messages, return another
 * that provides the same messages postfixed with the rule
 * that has been violated.
 *
 * @param {string} ruleName
 * @param {object} messages - Object whose keys are message identifiers
 *   and values are either message strings or functions that return message strings
 * @return {object} New message object, whose messages will be marked with the rule name
 */
export default function (ruleName, messages) {
  return Object.keys(messages).reduce((newMessages, messageId) => {
    const messageText = messages[messageId]
    newMessages[messageId] = (typeof messageText === "string")
      ? `${messageText} (${ruleName})`
      : (...args) => `${messageText(...args)} (${ruleName})`
    return newMessages
  }, {})
}