/** Stable lifecycle contract implemented by every first-party channel adapter. */
export declare const NEGOTIUM_ADAPTER_API_VERSION: 3;
export type Awaitable<T> = T | Promise<T>;
export interface NegotiumAdapterHandle<Name extends string = string> {
    /** Stable adapter key used in logs, configuration, and contract tests. */
    readonly name: Name;
    /** Stop accepting channel input and release every owned resource. Idempotent. */
    stop(): Awaitable<void>;
}
/** User-facing transcript semantics; transport gaps stay explicit metadata. */
export interface NegotiumAdapterProjectionCapabilities {
    /** Whether the surface can render a room timeline or only newly delivered events. */
    readonly transcript: "full" | "live-only";
    /** Whether pre-existing topic messages can populate the surface on binding. */
    readonly historyBackfill: boolean;
    /** How authors originating in another adapter are represented. */
    readonly externalAuthors: "native" | "relayed";
}
/** Optional behavioral surfaces are declared independently from lifecycle. */
export interface NegotiumAdapterCapabilities {
    /** Accepts a human message originating on this adapter. */
    readonly localUserInput: boolean;
    /** Exposes create/delete/reset/compact topic commands. */
    readonly topicManagement: boolean;
    /** Executes a turn placed by an external peer runtime. */
    readonly externalPlacedTurn: boolean;
}
export interface NegotiumAdapterDefinition<Name extends string, Options, Handle extends NegotiumAdapterHandle<Name>> {
    readonly apiVersion: typeof NEGOTIUM_ADAPTER_API_VERSION;
    readonly name: Name;
    readonly capabilities: NegotiumAdapterCapabilities;
    readonly projection: NegotiumAdapterProjectionCapabilities;
    start(options: Options): Awaitable<Handle>;
}
export declare function defineNegotiumAdapter<const Name extends string, Options, Handle extends NegotiumAdapterHandle<Name>>(definition: Omit<NegotiumAdapterDefinition<Name, Options, Handle>, "apiVersion">): NegotiumAdapterDefinition<Name, Options, Handle>;
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