import type { Spec } from '../../../../types/index.js';
import type { VelocityPeriod } from '../../../../types/portal.js';
/**
 * Group done specs by the month of their completedAt date.
 * Returns periods sorted chronologically.
 * Specs without actuals or completedAt are ignored.
 */
export declare function computeVelocity(specs: Spec[]): VelocityPeriod[];
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