/**
 * A process-wide registry of every `aviary:<lib>:<event>` channel name created or
 * emitted through this package.
 *
 * `node:diagnostics_channel` has no wildcard subscription: you can only subscribe
 * to a channel by its exact name. A generic observer (the Telescope watcher) that
 * wants to record *all* diagnostics therefore needs to (a) subscribe to every
 * channel that exists now and (b) be told when a new one appears. This registry
 * provides both: {@link registeredChannels} for the current set and
 * {@link onChannelRegistered} for future additions.
 */
/**
 * Record a channel name, notifying {@link onChannelRegistered} listeners the first
 * time it is seen. Idempotent: re-registering an existing name is a no-op.
 * Called by {@link getChannel}/{@link emit} so every channel touched through this
 * package is discoverable.
 */
export declare function registerChannel(name: string): void;
/** A snapshot of every `aviary:<lib>:<event>` channel registered so far. */
export declare function registeredChannels(): string[];
/**
 * Subscribe to channel registrations. The callback fires once per channel name
 * registered *after* this call. Returns an unsubscribe function.
 *
 * Note: this does NOT replay existing channels — a generic watcher should pair
 * it with {@link registeredChannels} to cover current + future names:
 *
 * ```ts
 * for (const name of registeredChannels()) subscribe(name);
 * const off = onChannelRegistered(subscribe);
 * ```
 */
export declare function onChannelRegistered(cb: (name: string) => void): () => void;
/**
 * Register a callback run by {@link resetRegistry}. Used internally by
 * {@link getChannel}'s memo cache; not part of the public contract.
 */
export declare function onRegistryReset(cb: () => void): void;
/**
 * Test-only: forget every registered channel and listener. Not part of the
 * public contract — exposed so suites can assert registration in isolation.
 */
export declare function resetRegistry(): void;
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