/**
 * Modpack compatibility matrix - Domain utility
 *
 * Aggregates a list of {@link ModVersion} (e.g. from a Modrinth modpack project)
 * into a loader → game-version compatibility matrix. This lets the UI present
 * only valid (loader, Minecraft version) combinations and lets the API validate
 * server creation requests, preventing the "No files available" failure that
 * occurs when an incompatible VERSION/MODRINTH_LOADER pair is passed to itzg.
 *
 * Pure domain logic: no external dependencies, no I/O.
 */
import type { ModVersion } from './ModVersion.js';
/**
 * Compatibility information for a single mod loader.
 */
export interface LoaderCompatibility {
    /** Minecraft versions supported by this loader, sorted newest-first. */
    gameVersions: string[];
    /**
     * Recommended modpack version number for each game version
     * (the newest modpack release supporting that game version).
     * Keyed by Minecraft game version.
     */
    recommended: Record<string, string>;
}
/**
 * Loader → compatibility matrix for a modpack project.
 */
export interface ModpackCompatibilityMatrix {
    /** Supported mod loaders, sorted alphabetically. */
    loaders: string[];
    /** Per-loader compatibility info. */
    byLoader: Record<string, LoaderCompatibility>;
}
/**
 * Build a loader → game-version compatibility matrix from modpack versions.
 *
 * Versions are expected to be supplied newest-first (as Modrinth returns them),
 * so for each (loader, game version) cell the first version encountered is
 * treated as the recommended/latest one.
 *
 * Versions with no loaders are ignored.
 *
 * @param versions - Modpack project versions
 * @returns Aggregated compatibility matrix
 */
export declare function buildModpackCompatibilityMatrix(versions: ModVersion[]): ModpackCompatibilityMatrix;
/**
 * Check whether a (loader, game version) combination is supported by the matrix.
 *
 * Loader comparison is case-insensitive.
 *
 * @param matrix - Compatibility matrix from {@link buildModpackCompatibilityMatrix}
 * @param loader - Mod loader name (e.g. "neoforge")
 * @param gameVersion - Minecraft version (e.g. "1.21.1")
 * @returns true if the modpack has a release for this combination
 */
export declare function isModpackCompatible(matrix: ModpackCompatibilityMatrix, loader: string, gameVersion: string): boolean;
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