/**
 * Layer canonical comment presentation over the live legacy config.
 *
 * The responsive options can be migrated independently, so merge that nested
 * bag by field while keeping canonical values authoritative.
 *
 * @param {Record<string, unknown>} config
 * @param {Record<string, unknown>} presentation
 * @returns {Record<string, unknown>}
 */
export function mergeCommentsConfig(config: Record<string, unknown>, presentation: Record<string, unknown>): Record<string, unknown>;