/**
 * Shared schema builders for TOON table rendering. Each FieldDef is a
 * projection from a source object (usually a Google API response row)
 * onto a named column in the output table.
 *
 * Usage:
 *   const schema = [
 *     field("id"),
 *     pluck("creator", "email", "creator_email"),
 *     mapEnum("status", { confirmed: "✓", tentative: "?" }, "unknown"),
 *     lower("visibility"),
 *   ];
 *   renderList("events", items, schema);
 */
export interface FieldDef {
    name: string;
    extract: (item: Record<string, unknown>) => unknown;
}
export declare function field(name: string): FieldDef;
export declare function lower(name: string): FieldDef;
export declare function pluck(parent: string, child: string, alias?: string): FieldDef;
export declare function mapEnum(name: string, mapping: Record<string, string>, fallback: string, alias?: string): FieldDef;
/**
 * Compute a field from the whole item. Use for derived values (e.g.
 * "5/8 attendees confirmed", "tomorrow 2pm").
 */
export declare function computed(name: string, fn: (item: Record<string, unknown>) => unknown): FieldDef;
/**
 * Truncate a string to `max` chars with ellipsis. Returns the original
 * value when it's not a string.
 */
export declare function truncated(name: string, max: number, alias?: string): FieldDef;