/** The canonical nil/zero UUID sentinel. */
export declare const NIL_UUID = "00000000-0000-0000-0000-000000000000";
/**
 * True when `value` is the nil UUID string. Tolerant of surrounding whitespace
 * and letter-case (UUIDs are conventionally lowercase, but be defensive). Only
 * matches strings — numeric/object values are never the nil UUID.
 */
export declare const isNilUuid: (value: unknown) => boolean;
/**
 * Normalizes a raw cell value: returns `undefined` when it is the nil UUID so
 * downstream renderers hit their existing nullish/empty branches; otherwise the
 * value is passed through unchanged.
 */
export declare const normalizeNilUuid: <T>(value: T) => T | undefined;
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