stylelint/src/rules/at-rule-no-vendor-prefix/index.js

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

export const ruleName = "at-rule-no-vendor-prefix"

export const messages = ruleMessages(ruleName, {
  rejected: p => `Unexpected vendor-prefixed at-rule "@${p}"`,
})

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

    root.walkAtRules(atRule => {
      if (!isStandardSyntaxAtRule(atRule)) { return }

      const { name } = atRule

      if (name[0] !== "-") { return }

      if (!isAutoprefixable.atRuleName(name)) { return }

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