/**
 * Stage 3.5 — Feature derivation.
 *
 * Pure data→data over the catalog + indexes. A *plain view* by default
 * (ADR-0006): only the columns the caller requests are computed
 * (lazy/needed-only), and the in-engine rules consume the result without it
 * ever being persisted for their sake. The dashboard columns (blast / scc /
 * packageCoupling) are materialized into the catalog JSON only when the
 * producing run requests them.
 *
 * Algorithms here are ports of analyses that first lived in dashboard-side
 * JavaScript (`code-paths/indexes.ts` blast, `code-paths/scc.ts` Tarjan,
 * `code-paths/view-coupling.ts` coupling) or inline inside individual rules
 * (the `endLine − line + 1` span, `orphan-subtree`'s reachability BFS,
 * `test-only-reachable`'s prod BFS). The engine is now the canonical home for
 * computed feature columns; dashboard helpers still assemble view-local
 * indexes and drilldowns from the catalog plus the precomputed features.
 */
import type { Catalog, FeatureColumn, FeatureTable, GraphConfig, Indexes, PersistedFeatures, SccFeatures } from '../types.js';
/**
 * Compute the requested feature columns over the catalog + indexes. Only the
 * entities whose driving columns are present are populated; everything else
 * is the shared empty value. An empty `requested` ⇒ an all-empty table.
 */
export declare function buildFeatures(catalog: Catalog, indexes: Indexes, config: GraphConfig, requested: readonly FeatureColumn[]): FeatureTable;
/**
 * Occurrence-level SCCs via the shared Tarjan primitive + occurrence call graph.
 * Singletons included; members sorted; package-crossing labels preserved.
 */
export declare function computeSccs(indexes: Indexes): SccFeatures[];
/**
 * Project a `FeatureTable` to the JSON-safe `PersistedFeatures`, OMITTING any
 * entity whose driving column was not requested (so an empty-request table
 * projects to `{}` and a lean default-run persists no blob). Maps → records;
 * arrays pass through.
 */
export declare function toPersistedFeatures(table: FeatureTable, requested: readonly FeatureColumn[]): PersistedFeatures;
/** True when no entity is present (or every present entity is empty). */
export declare function isPersistedFeaturesEmpty(persisted: PersistedFeatures): boolean;
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