import type { Spec } from '../../../../types/index.js';
import type { PortalBurndownPoint } from '../../../../types/portal.js';
/**
 * Compute a sprint-level burndown from specs.
 * Uses createdAt to determine when work started and completedAt for done dates.
 * Returns daily data points sorted by date.
 * Returns empty array when no specs have dates.
 */
export declare function computeBurndown(specs: Spec[]): PortalBurndownPoint[];
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