stylelint/src/rules/selector-root-no-composition/index.js

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import {
  report,
  ruleMessages,
  validateOptions,
} from "../../utils"

export const ruleName = "selector-root-no-composition"

export const messages = ruleMessages(ruleName, {
  rejected: "Unexpected composition of the \":root\" selector",
})

export default function (actual) {
  return (root, result) => {
    const validOptions = validateOptions(result, ruleName, { actual })
    if (!validOptions) { return }

    root.walkRules(rule => {
      if (rule.selector.indexOf(":root") === -1) { return }

      if (rule.selector.trim() === ":root") { return }

      report({
        message: messages.rejected,
        node: rule,
        result,
        ruleName,
      })
    })
  }
}