import type { OverlayInput, OverlayScopeContext, OverlayTargetRef, SignedOverlaySpec } from './spec';
import type { OverlayValidator } from './validator';
export interface OverlayRegistryOptions {
    validator?: OverlayValidator;
    allowUnsigned?: boolean;
}
export interface OverlayLookup extends OverlayScopeContext, OverlayTargetRef {
}
export declare class OverlayRegistry {
    private readonly options;
    private readonly overlays;
    constructor(options?: OverlayRegistryOptions);
    register(overlay: OverlayInput, options?: {
        skipValidation?: boolean;
    }): SignedOverlaySpec;
    unregister(overlayId: string, version?: string): void;
    list(): SignedOverlaySpec[];
    get(overlayId: string, version: string): SignedOverlaySpec | undefined;
    forContext(query: OverlayLookup): SignedOverlaySpec[];
    clear(): void;
    size(): number;
    private ensureSigned;
    private getKey;
}