/**
 * Runtime tree that mirrors a `Spec`'s group structure. Values remain unknown
 * at this boundary so producers and consumers can narrow branches and registry
 * items as needed.
 */
export interface RegistryItems {
    readonly [key: string]: unknown;
}
/**
 * The names of the function-shaped entries in a group's (flat, isolated)
 * registry. `FunctionImpl.make` registers each function under a single-segment
 * key, so the registry built for one group contains exactly that group's
 * functions at the top level.
 */
export declare const functionNames: (items: RegistryItems) => ReadonlyArray<string>;
/**
 * The keys of the middleware implementations registered into a group's registry
 * (stored under `middleware:<key>` entries by `MiddlewareImpl`).
 */
export declare const middlewareKeys: (items: RegistryItems) => ReadonlyArray<string>;
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