Having the import of the same file twice, makes one of them useless. Leaving them in reduces the code’s readability, since their presence can be
confusing.
Noncompliant code example
@import 'a.css';
@import 'a.css'; // Noncompliant
@import url("a.css");
@import url("a.css"); // Noncompliant
Exceptions
This rule ignores @import in less files.
