/**
 * Singleton registry mapping `(command, kind)` → renderer.
 *
 * The registry is process-global; per-command renderers register themselves
 * at module-load time and {@link ./render-envelope.ts | renderEnvelopeForHuman}
 * looks them up at call time. Last-write wins when two registrations target
 * the same `(command, kind)` slot — this keeps test setup simple and lets
 * later modules override earlier registrations when needed.
 *
 * @epic T10114
 * @task T10130
 */
import type { RenderableEnvelope } from '@cleocode/contracts';
import type { RegistryKey, Renderer } from './types.js';
/**
 * Register a renderer for a specific `(command, kind)` pair.
 *
 * Last-write wins — registering twice for the same key replaces the previous
 * entry without warning. Callers that need uniqueness checks should call
 * {@link lookupRenderer} first.
 *
 * @typeParam T — envelope payload shape the renderer understands.
 * @param command Command identifier (e.g. `'tasks.list'`).
 * @param kind Envelope discriminator (e.g. `'tree'`, `'table'`).
 * @param renderer Function that converts the envelope to a string.
 */
export declare function registerRenderer<T>(command: string, kind: RenderableEnvelope<T>['kind'], renderer: Renderer<T>): void;
/**
 * Look up the renderer registered for `(command, kind)`.
 *
 * @typeParam T — expected envelope payload shape.
 * @returns The registered renderer, or `undefined` when none is registered.
 */
export declare function lookupRenderer<T>(command: string, kind: RenderableEnvelope<T>['kind']): Renderer<T> | undefined;
/**
 * Test-only — clear every registration. Production code MUST NOT call this.
 */
export declare function _resetRegistryForTests(): void;
/**
 * Snapshot the registered keys in sorted order. Useful for telemetry and
 * debug surfaces that need to enumerate which `(command, kind)` slots are
 * covered.
 */
export declare function listRegisteredRenderers(): RegistryKey[];
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