* Clone and add prefixes for at-rule
(rule, prefix)
| 5 | * Clone and add prefixes for at-rule |
| 6 | */ |
| 7 | add(rule, prefix) { |
| 8 | let prefixed = prefix + rule.name |
| 9 | |
| 10 | let already = rule.parent.some( |
| 11 | i => i.name === prefixed && i.params === rule.params |
| 12 | ) |
| 13 | if (already) { |
| 14 | return undefined |
| 15 | } |
| 16 | |
| 17 | let cloned = this.clone(rule, { name: prefixed }) |
| 18 | return rule.parent.insertBefore(rule, cloned) |
| 19 | } |
| 20 | |
| 21 | /** |
| 22 | * Clone node with prefixes |