Function isMediaRule

src/inject/dynamic-theme/css-rules.ts:216–231

(rule: CSSRule | null)

}

export function isMediaRule(rule: CSSRule | null): rule is CSSMediaRule {
    if (!rule) {
        return false;
    }
    if (styleRules.has(rule)) {
        return false;
    }
    if (mediaRules.has(rule)) {
        return true;
    }
    if ((rule as CSSMediaRule).media) {
        mediaRules.add(rule);
        return true;
    }
    return false;
}

export function isSupportsRule(rule: CSSRule | null): rule is CSSSupportsRule {
    if (!rule) {