import type { AssetLoadError, Result } from '@forgeax/engine-types';
export interface AssetGraphOptions<P extends {
    readonly value: unknown;
    readonly refs: readonly string[];
}> {
    readonly read: (guid: string, signal: AbortSignal) => Promise<Result<P, AssetLoadError>>;
    readonly maxConcurrentReads?: number;
}
export interface AssetGraphCounters {
    readonly loads: number;
    readonly cacheHits: number;
    readonly readErrors: number;
    readonly noChange: number;
    readonly listenerFailures: number;
}
export interface AssetGraphSnapshot {
    readonly epoch: number;
    readonly ready: readonly string[];
    readonly pending: number;
    readonly resources: number;
    readonly sccs: readonly (readonly string[])[];
    readonly counters: AssetGraphCounters;
}
type GraphResult<P> = Result<P, AssetLoadError>;
type GraphListener = (snapshot: AssetGraphSnapshot) => void;
export declare class AssetGraph<P extends {
    readonly value: unknown;
    readonly refs: readonly string[];
}> {
    private readonly read;
    private readonly limit;
    private readonly ready;
    private readonly forward;
    private readonly reverse;
    private readonly reads;
    private readonly requests;
    private readonly listeners;
    private readonly lifetime;
    private readonly sccs;
    private activeReads;
    private readWaiters;
    private disposed;
    private epoch;
    private counters;
    private currentSnapshot;
    constructor(options: AssetGraphOptions<P>);
    load(guid: string, signal?: AbortSignal): Promise<GraphResult<P>>;
    invalidate(guid: string): readonly string[];
    invalidateForCatalogChange(guids?: readonly string[]): void;
    subscribe(listener: GraphListener): () => void;
    snapshot(): AssetGraphSnapshot;
    lookup(guid: string): P['value'] | undefined;
    guidOf(value: P['value']): string | undefined;
    dispose(): void;
    private loadClosure;
    private visit;
    private readOnce;
    private withPermit;
    private link;
    private collectAffected;
    private drop;
    private promote;
    private recordScc;
    private publish;
}
export {};
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