/**
 * EVO-9 — MUTUALISATION. The **positive mirror of NHI9** (`nhi.ts`): where NHI9
 * flags a *credential* reused across instances as a risk, MUTUALISATION flags a
 * *scope* held by two or more instances as a **capitalisation opportunity** — a
 * place where effort, artefacts or learning could be shared. It feeds the MIT
 * librarisation goal.
 *
 * Like `nhiInventory`, it is a **pure derived advisory**: it surfaces candidates
 * and **obligates nothing** (the engine never judges legitimacy, never acts). It
 * reuses the {@link H2AOrgRegisteredInstance} shape (`instance` + `scopes`) the
 * registry already produces (`effectiveOrgInstances`, `org.ts`).
 *
 * Pure, total, deterministic: no I/O, no clock, never throws; output ordered by
 * scope then by instance id, independent of input order.
 */
import type { H2AOrgRegisteredInstance } from "./org.js";
/**
 * One capitalisation candidate: a single `scope` that two or more `instances`
 * share. Advisory only — naming where mutualisation *could* happen, never an
 * obligation to mutualise.
 */
export interface H2AMutualisationOpportunity {
    readonly scope: string;
    /** The (≥2) instances sharing this scope, sorted by id. */
    readonly instances: readonly string[];
}
/**
 * Derive the mutualisation opportunities across a set of registry instances:
 * one opportunity per scope held by ≥2 distinct instances. Single-instance
 * scopes are ignored (nothing to mutualise). Total and deterministic:
 *
 *  - empty / single-instance input → `[]`;
 *  - a scope an instance lists more than once does not self-overlap;
 *  - opportunities are ordered by `scope`, and each opportunity's `instances`
 *    are sorted, so the result is independent of input order;
 *  - malformed rows (missing/!array `scopes`, non-string ids) are skipped.
 */
export declare function deriveMutualisationOpportunities(instances: readonly H2AOrgRegisteredInstance[] | undefined): H2AMutualisationOpportunity[];
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