/**
 * astroengine capabilities -- what this engine instance can compute, over what
 * span, from which source.
 *
 * The valid range differs per body and per data tier (an embedded browser
 * bundle carries Meeus Pluto, 1885-2099; a Node install with the Chebyshev
 * pack reaches 1700-2212), and until this module a caller had no way to ask
 * which engine it got. {@link engineCapabilities} answers from the loaded
 * {@link EngineData} plus the measured-range table in `ranges.ts`.
 *
 * Fitted spans come from the packs themselves (`jd0 + segments * seg_days`),
 * so a wider future pack reports its true span with no code change.
 */
import type { Engine } from "./chart.js";
import { type BodySpan } from "./ranges.js";
/** The position source active for a body in a given engine's data. */
export type BodySource = "vsop87d" | "moon_chebyshev" | "meeus_ch47" | "chebyshev_pack" | "meeus_ch37" | "kepler_pack" | "analytic" | "synthetic";
export interface BodyCapability {
    body: string;
    source: BodySource;
    /** Measured validated span (vs Swiss Ephemeris / JPL Horizons), or null
     *  for analytic series with no stated bound and synthetic bodies. */
    validated: BodySpan | null;
    /** The pack's fitted span for packed sources. Outside it the body is
     *  reported in `Chart.unavailable` rather than computed. */
    fitted?: BodySpan;
}
export interface EngineCapabilities {
    /** The measured headline range (every default body holds across it). */
    headline: BodySpan;
    /** The headline as prose (kept in lockstep with `accuracy.json` by the
     *  claims registry via ranges.ts). */
    headlineLabel: string;
    /** Whether the precise-Moon Chebyshev tier is loaded. */
    moonTier: "chebyshev" | "analytic";
    /** Whether the wide-range Pluto pack supersedes the Meeus series. */
    plutoTier: "chebyshev" | "meeus";
    /** One entry per body this engine can compute (see {@link Engine.bodies}). */
    bodies: BodyCapability[];
}
/**
 * What this engine can compute, over what span, from which source -- derived
 * from the loaded {@link EngineData} plus the measured-range table. Use it to
 * distinguish tiers at runtime (browser embedded vs Node with packs) instead
 * of assuming the headline applies to every body.
 *
 * @param engine The engine to introspect.
 * @returns Per-body sources with validated and fitted spans.
 */
export declare function engineCapabilities(engine: Engine): EngineCapabilities;