/**
 * Pure helpers shared by the catalog node dispatchers (`A2UINode`,
 * `urbicon/UrbiconA2UINode`). No Svelte — just the payload-shaping logic both
 * renderers need identically. The reactive plumbing (the `$derived`/`$state`
 * two-way-binding wiring) is deliberately NOT extracted: it is duplicated per
 * dispatcher so each stays a self-contained, readable component.
 *
 * `dedupeOptions` is load-bearing for the "never throw" contract: EVERY
 * payload-driven keyed `{#each}` over option values must dedupe first, or two
 * equal keys throw Svelte's `each_key_duplicate` — a hard render crash on an
 * untrusted payload. The validator only WARNS on duplicates; the renderer must
 * drop them.
 */
/**
 * Coerce an unknown resolved value to display text: strings pass through, finite
 * numbers stringify, everything else (null/undefined/object/NaN) becomes `''`.
 */
export declare function coerceText(value: unknown): string;
/**
 * Normalise a raw options array into a deduped `{ value, label }` list (first
 * occurrence of each value wins). `resolveLabel` turns a raw label value (a
 * literal or a `{ path }` binding) into display text — the caller injects its
 * data-binding resolver. Malformed options (non-object, non-string value) are
 * skipped. Dedup is mandatory: the rendered list is keyed on `value`.
 */
export declare function dedupeOptions(rawOptions: unknown, resolveLabel: (rawLabel: unknown) => string): Array<{
    value: string;
    label: string;
}>;
/** Keep only the leading `HH:MM(:SS)?` of a time string; `''` if there is none. */
export declare function normalizeTimePart(value: string): string;
/**
 * Split one ISO 8601 date/time literal into its date and time parts, timezone-
 * naively (a trailing offset/`Z` is dropped, never re-attached — timezone
 * semantics belong to the agent, not a UI renderer without timezone context).
 */
export declare function splitDateTime(value: string): {
    date: string;
    time: string;
};