/**
 * User message extraction for AI SDK v3 (`parts`) and legacy (`content`)
 * message shapes. Useful when you need plain text from a chat history —
 * e.g. for fingerprinting, logging, or short-circuit routing decisions
 * before the message hits an LLM.
 *
 * Lifted into the SDK from `@shogo/shared-runtime` (was AGPL) under MIT.
 * The original `@shogo/shared-runtime/chat-message` re-exports this
 * module unchanged for backwards compatibility.
 */
/** Find the last user message in a messages array. */
declare function findLastUserMessage(messages: any[]): any | null;
/**
 * Extract plain text from a user message object.
 * Handles AI SDK v3 `parts` format, legacy `content` string,
 * and legacy `content` array format.
 */
declare function extractUserText(message: any): string;

export { extractUserText, findLastUserMessage };