import type { IdentClient } from '@ident-agency/core';
/**
 * Lens execution context
 */
export interface LensContext {
    client: IdentClient;
    subject: {
        hash: string;
    };
    args?: Record<string, any>;
}
/**
 * A lens is a pure function: fragments in → derived data out
 */
export type Lens = (ctx: LensContext) => Promise<any>;
/**
 * Register a new lens
 */
export declare function registerLens(path: string, fn: Lens): void;
/**
 * Resolve and run a lens
 */
export declare function resolveLens(path: string, ctx: LensContext): Promise<any>;
/**
 * List available lenses
 */
export declare function listLenses(): string[];
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