import type { VerbatimCompactionStats } from "./compaction-types.js";
/**
 * Widen symmetric region-level compaction stats into whole-context stats using
 * the independently estimated kept tail.
 *
 * Both before and after counts are deliberately heuristic and symmetric: the
 * tail estimate is added to the heuristic region `tokensBefore` and — only when
 * the tail is kept — to the heuristic region `tokensAfter`. `percentReduction`
 * is recomputed from these two widened counts. The authoritative provider-aware
 * `preparation.tokensBefore` is *never* mixed into this comparison; it travels
 * separately (`VerbatimCompactionResult.tokensBefore` / `CompactionEntry.tokensBefore`)
 * for budgeting and display only.
 *
 * A dropped tail contributes to the heuristic before count but not the after
 * count, which is what makes fresh-compaction stats honest about the content
 * actually being dropped.
 *
 * Shared by the planned, fresh, and extension compaction rungs (#2052).
 */
export declare function widenToWholeContextStats(regionStats: VerbatimCompactionStats, keptTailEstimate: number, keptTail: boolean): VerbatimCompactionStats;
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