/**
 * DEC-098 — SysML v2 interop S2 (spec: docs/sysml-interop.md §7, DEC-081). The
 * I/O adapter: fetch a referenced element from the SysML v2 API & Services and
 * canonical-hash it for content-integrity (trust level (b), §4). Pure ref types
 * stay in core (S1); all I/O lives here. The verify path + CLI are S3.
 *
 * Endpoint follows the OMG SysML v2 API & Services REST/HTTP PSM:
 *   GET {apiBase}/projects/{project}/commits/{commit}/elements/{element}
 *
 * The HTTP client is injectable (`fetchImpl`) so the adapter is unit-testable
 * against a mock API with no network. API credentials are held out-of-band and
 * passed per call (`auth`); h2a never embeds them in envelopes (§6).
 */
import { type H2ASysmlRef } from "@sentropic/h2a";
/** Minimal subset of the Fetch `Response` the adapter needs (global `fetch` satisfies it). */
export interface SysmlFetchResponse {
    readonly ok: boolean;
    readonly status: number;
    json(): Promise<unknown>;
}
export type SysmlFetchImpl = (url: string, init?: {
    headers?: Record<string, string>;
}) => Promise<SysmlFetchResponse>;
export interface ResolveSysmlOptions {
    /** Repository base URL; falls back to `ref.apiBase`. */
    readonly apiBase?: string;
    /** Bearer token for the SysML API (held out-of-band, never in an envelope). */
    readonly auth?: string;
    /** Injected HTTP client; defaults to global `fetch`. */
    readonly fetchImpl?: SysmlFetchImpl;
}
/**
 * Fetch the referenced element at its immutable commit. Requires `ref.element`
 * (whole-project resolution — `element` omitted — is a later slice; default
 * documented in docs/loop-decisions.md). Throws on a non-OK HTTP status.
 */
export declare function resolveSysmlElement(ref: H2ASysmlRef, options?: ResolveSysmlOptions): Promise<unknown>;
/**
 * Canonical hash of a fetched element, for content-integrity (trust level (b)).
 * Reuses the core canonical hashing (DEC-035) so the value is comparable to a
 * `ref.elementHash` embedded at sign time.
 */
export declare function hashSysmlElement(element: unknown): string;
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