/**
 * Turns newly-correlated spans into append-only status lines for `workflow
 * monitor`. Unlike the waterfall (which needs the full span set up front to
 * lay out a time axis), a live monitor just reports each span's status
 * transitions as they're observed on each poll.
 */
import type { Span, SpanStatus } from '#services/workflow_history/correlator.js';
export interface SpanUpdate {
    span: Span;
    label: string;
}
/**
 * Returns spans whose status changed since the last call. `seen` is mutated
 * in place so callers can carry it across polls. Pending spans are skipped —
 * nothing worth reporting until a step starts.
 */
export declare function diffSpanUpdates(spans: Span[], labels: Map<string, string>, seen: Map<string, SpanStatus>): SpanUpdate[];
/** Formats the continue-as-new transition line, keeping its glyph in the formatting layer. */
export declare function formatContinuedAsNew(runId: string): string;
export declare function formatSpanUpdate(update: SpanUpdate, color: boolean): string;