Variable number of style strings (can include null or undefined)
A single concatenated string with all valid styles
const baseStyles = '.container { padding: 1rem; }';
const conditionalStyles = isDark ? '.container { background: #000; }' : null;
const moreStyles = '.container { border: 1px solid; }';
const combined = combineStyles(baseStyles, conditionalStyles, moreStyles);
// Returns: '.container { padding: 1rem; }.container { border: 1px solid; }'
// (conditionalStyles was null, so it was filtered out)
Combines multiple style strings into a single string, filtering out null/undefined values. This is useful for conditionally combining CSS strings from different sources.