import { Hono } from 'hono';
import type { BuildContextOptions } from '../services/context-builder.js';
import { type ChatRuntimeId } from '../services/chat-runtime-adapters.js';
type WriteFunc = (event: string, data: string) => void;
export declare function processStreamLine(line: string, write: WriteFunc, runtime?: ChatRuntimeId): void;
/**
 * Assemble the outgoing context with the prior conversation injected, applying
 * proactive compaction: estimate the prompt byte size and, if it crosses the
 * model budget threshold, collapse older history into a deterministic summary
 * (keeping recent turns verbatim) so a long thread never hits "Prompt is too
 * long". Returns the summary when compaction occurred so the caller can record a
 * one-shot `context-compacted` marker for the stream.
 */
export declare function assembleHistoryContext(baseContext: string, message: string, history: Array<{
    role: string;
    content: string;
}> | undefined, maxBytes: number): {
    context: string;
    proactiveCompactionSummary: string | null;
};
export declare function guardFirstMessageContext(workspace: string, baseContext: string, message: string, contextOpts: BuildContextOptions, model?: string): {
    context: string;
    notice: string | null;
};
export declare function chatRoute(cwd: string): Hono;
export {};