import { type ArkmeLinkMetadata } from '../link-metadata.js';
export interface ArkmeLinkMetadataResolver {
    resolve(url: string): Promise<ArkmeLinkMetadata | null>;
}
export declare function arkmeShouldResolveLinkMetadata(url: string): boolean;
export type ArkmeLinkMetadataHostCall = (operation: 'link.metadata', params: Record<string, unknown>) => Promise<ArkmeLinkMetadata | null>;
export declare class ArkmeHostLinkMetadataResolver implements ArkmeLinkMetadataResolver {
    private readonly callHost;
    private readonly cache;
    private readonly inFlight;
    private readonly cacheSize;
    private readonly maxInFlight;
    constructor(callHost?: ArkmeLinkMetadataHostCall, options?: {
        cacheSize?: number;
        maxInFlight?: number;
    });
    resolve(url: string): Promise<ArkmeLinkMetadata | null>;
}
export declare const arkmeLinkMetadataResolver: ArkmeLinkMetadataResolver;
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