/**
 * Wire-format normalizers for play items and device descriptors.
 *
 * The SDK accepts two input shapes for convenience:
 *
 *   flat   — `{ type: 'tts', text: 'hi' }`
 *   nested — `{ type: 'tts', params: { text: 'hi' } }`
 *
 * The RELAY Blade protocol only accepts the nested form. These helpers fold
 * the flat form into the nested form before the RPC goes out so both shapes
 * work at the call sites (play/playAndCollect/connect/refer/tap/dial).
 *
 * Passing through an already-nested item is idempotent.
 */
/** Normalize a single play item (tts/audio/silence/ringtone). */
export declare function normalizePlayItem(item: Record<string, unknown>): Record<string, unknown>;
/** Normalize an array of play items. */
export declare function normalizePlayItems(items: Record<string, unknown>[]): Record<string, unknown>[];
/**
 * Normalize a single device descriptor (phone/sip/webrtc/agora/stream/...).
 *
 * For `phone`, also renames the SDK's short `to`/`from` keys to the wire-format
 * `to_number`/`from_number` that the platform expects.
 */
export declare function normalizeDevice(device: Record<string, unknown>): Record<string, unknown>;
/** Normalize a 2D dial plan (outer = serial groups, inner = parallel devices). */
export declare function normalizeDevicePlan(plan: Record<string, unknown>[][]): Record<string, unknown>[][];