import { O as SessionMessage, a as alignBoundaryForward, c as createCompactFunction, d as sanitizeToolPairs, i as alignBoundaryBackward, l as findTailCutByTokens, n as CompactOptions, o as buildSummaryPrompt, r as CompactResult, s as computeSummaryBudget, t as COMPACTION_PREFIX, u as isCompactionMessage } from "../../../compaction-helpers-CzCq1-fF.js";

//#region src/experimental/memory/utils/tokens.d.ts
/** Approximate characters per token for English text */
declare const CHARS_PER_TOKEN = 4;
/** Approximate token multiplier per whitespace-separated word */
declare const WORDS_TOKEN_MULTIPLIER = 1.3;
/** Approximate overhead tokens per message (role, framing) */
declare const TOKENS_PER_MESSAGE = 4;
/**
 * Estimate token count for a string using a hybrid heuristic.
 *
 * Takes the max of two estimates:
 * - Character-based: `length / 4` — better for dense content (JSON, code, URLs)
 * - Word-based: `words * 1.3` — better for natural language prose
 *
 * This is a heuristic. Do not use where exact counts are required.
 */
declare function estimateStringTokens(text: string): number;
/**
 * Estimate total token count for an array of UIMessages.
 *
 * Walks each message's parts (text, tool invocations, tool results)
 * and applies per-message overhead.
 *
 * This is a heuristic. Do not use where exact counts are required.
 */
declare function estimateMessageTokens(messages: SessionMessage[]): number;
//#endregion
//#region src/experimental/memory/utils/compaction.d.ts
interface TruncateOptions {
  /** Number of recent messages to keep intact (default: 4) */
  keepRecent?: number;
  /** Max chars for tool outputs in older messages (default: 500) */
  maxToolOutputChars?: number;
  /** Max chars for text parts in older messages (default: 10000) */
  maxTextChars?: number;
}
/**
 * Truncate tool outputs and long text in older messages.
 * Returns a new array — input messages are not mutated.
 *
 * Recent messages (last `keepRecent`) are left intact.
 * Older messages get tool outputs and long text truncated.
 *
 * Use in assembleContext() before sending to the LLM:
 * ```typescript
 * async assembleContext() {
 *   const history = this.sessions.getHistory(this._sessionId);
 *   const truncated = truncateOlderMessages(history);
 *   return convertToModelMessages(truncated);
 * }
 * ```
 */
declare function truncateOlderMessages(messages: SessionMessage[], options?: TruncateOptions): SessionMessage[];
//#endregion
export { CHARS_PER_TOKEN, COMPACTION_PREFIX, type CompactOptions, type CompactResult, TOKENS_PER_MESSAGE, type TruncateOptions, WORDS_TOKEN_MULTIPLIER, alignBoundaryBackward, alignBoundaryForward, buildSummaryPrompt, computeSummaryBudget, createCompactFunction, estimateMessageTokens, estimateStringTokens, findTailCutByTokens, isCompactionMessage, sanitizeToolPairs, truncateOlderMessages };
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