/**
 * The id the grid engine assigns to a column def.
 *
 * @param def       the column def (only `id` / `field` are read)
 * @param parentId  id of the enclosing column group, if any
 * @param depth     nesting depth of `def` - 0 at the top level
 * @param index     position of `def` within its own sibling array
 */
export declare function resolveColumnId(def: any, parentId: string | undefined, depth: number, index: number): string;