/**
 * window/removal — "these messages left" → the facts the ledger needs.
 *
 * Pattern: Pure function over the meter's provenance.
 * Role:    core/ layer. The stage binds this into every
 *          `WindowStrategyInput.removalFacts`, so a strategy can name what it
 *          removed without ever touching the meter — and cannot file a
 *          removal it is unable to name.
 * Emits:   N/A.
 */
import type { MessageOrigin } from '../../../recorders/core/CompactionMeter.js';
import type { RemovalFacts } from './strategy.js';
/**
 * Resolve which stages wrote the removed messages, and how long each lived.
 *
 * `survivalMs` is measured (`atMs - bornAtMs`), and is 0 — not a guess — when
 * a message's birth is unknown, which happens only for a window seeded from
 * outside this run.
 */
export declare function removalFacts(origins: readonly MessageOrigin[], indices: readonly number[], atMs: number): RemovalFacts;
/** `[from, toExclusive)` as a list of indices. */
export declare function indexRange(from: number, toExclusive: number): number[];