You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: at_rule_no_unknown.rs
    path of file: ./repos/swc/crates/swc_css_lints/src/rules
    
    the code of the file until where you have to start completion: use serde::{Deserialize, Serialize};
use swc_css_ast::*;
use swc_css_visit::{Visit, VisitWith};

use crate::{
    pattern::NamePattern,
    rule::{visitor_rule, LintRule, LintRuleContext},
    ConfigError,
};

#[derive(Debug, Clone, Default, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct AtRuleNoUnknownConfig {
    ignore_at_rules: Option<Vec<String>>,
}

pub fn at_rule_no_unknown(
    ctx: LintRuleContext<AtRuleNoUnkno
    
    fn visit_at_rule(&mut self, at_rule: &AtRule) {
        if let AtRuleName::Ident(Ident { value, .. }) = &at_rule.name {
            if let Some(AtRulePrelude::ListOfComponentValues(_)) = at_rule.prelude.as_deref() {
                if self.ignored.iter().all(|item| !item.is_match(value)) {
                    let message = format!("Unexpected unknown at-rule \"@{}\".", &value);

                    self.ctx.report(&at_rule.name, message);
                }
            }
        }

        at_rule.visit_children_with(self);
    }