import type { Message } from '../../types/message/index.js';
/**
 * Maximum accumulated inline rich-content payload sent on one model request.
 *
 * Base64 is ASCII, so its JavaScript string length is also its encoded wire
 * payload length before the surrounding JSON. The bound deliberately counts
 * the encoded value rather than estimating decoded bytes: request gateways
 * reject the body they receive, not the file the body represents.
 */
export declare const DEFAULT_MAX_REQUEST_RICH_CONTENT_BYTES: number;
export declare function resolveMaxRequestRichContentBytes(value: number | undefined): number;
export interface RequestImageIdentity {
    readonly data: string;
    readonly mediaType: string;
}
/**
 * Build the provider-bound view of a conversation without editing history.
 *
 * User attachments and rich tool-result blocks share one oldest-first budget.
 * Tool messages and their `toolCallId` are never removed, so the projected
 * transcript retains its provider-valid call/result structure. Returning the
 * original array when nothing is omitted makes the no-op and exact-boundary
 * cases observable and keeps the common path allocation-free.
 */
export declare function projectRequestRichContent(messages: Message[], maxBytes: number): Message[];
/** Find the one distinct image in the exact provider-bound request, if one exists. */
export declare function findSingleRequestImage(messages: readonly Message[]): RequestImageIdentity | null;
/** Build the one-off retry request without changing durable conversation state. */
export declare function projectRequestWithoutImage(messages: Message[], identity: RequestImageIdentity): Message[];
/** Persist a successful recovery while retaining exact image bytes. */
export declare function markProviderRejectedImage(messages: readonly Message[], identity: RequestImageIdentity): {
    readonly messages: Message[];
    readonly count: number;
};
//# sourceMappingURL=request-rich-content.d.ts.map