/**
 * Normalizes a filter's description for structured output.
 *
 * A filter with no description can arrive as either `null` or `""`: the column is
 * nullable, and the sync view normalizes NULL to an empty string on the way out.
 * Both mean the same thing, so both collapse to `undefined` here.
 *
 * Returning `undefined` rather than `null` matters. Structured content is sanitised
 * with `removeNullFields` on the way out, so a null would be stripped from the payload
 * and then fail validation against the declared output schema, which is optional
 * rather than nullable.
 */
export declare function readFilterDescription(filter: {
    description?: string | null;
}): string | undefined;
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