import type { FeedBlock } from "./feed-blocks.js";
export interface CommitDecision {
    /** Append-only, in order. `<Static>` cannot take content back. */
    readonly committed: readonly FeedBlock[];
    readonly live: readonly FeedBlock[];
    readonly committedCount: number;
}
export interface CommitInput {
    readonly blocks: readonly FeedBlock[];
    readonly liveBudgetRows: number;
    readonly committedCount: number;
    /** True on `turn-start`: everything from an earlier turn commits. */
    readonly turnBoundary: boolean;
    /** Turn the incoming prompt belongs to; blocks older than it commit. */
    readonly currentTurnId?: string | undefined;
}
/**
 * Split blocks into the append-only committed prefix and the re-renderable
 * live suffix.
 *
 * Rule 1 — monotonic: `committedCount` never decreases.
 * Rule 2 — whole blocks only: a block is never split.
 * Rule 3 — commit on budget overflow, turn boundary, or own height.
 * Rule 4 — an open block is never committed while it is open.
 */
export declare function decideCommit(input: CommitInput): CommitDecision;