/** Persisted attribute that holds host CSS classes for a column or row. */
export declare const CSS_CLASSES_ATTRIBUTE_NAME = "css-classes-3-resolutions";
/**
 * Untrusted leaf from a persisted payload → a safe class string, or null.
 *
 * This is a passthrough, not a validator: RuleCMS forms no opinion about what a
 * host app's class names look like. Never throws and never logs.
 */
export declare function normalizeCssClasses(value: unknown): string | null;
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