import { type NativeChatSelectionSnapshot } from '../native-chat-selection-contract.js';
export interface NativeSelectionSnapshot {
    readonly active: boolean;
    readonly keys: ReadonlySet<string>;
}
export declare const EMPTY_NATIVE_SELECTION: NativeSelectionSnapshot;
export type NativeSelectionAction = {
    type: 'enter';
    key?: string;
} | {
    type: 'exit';
} | {
    type: 'toggle' | 'remove';
    key: string;
};
/** Pure session-local selection rules; React owns subscription and lifetime. */
export declare function nativeSelectionReducer(state: NativeSelectionSnapshot, action: NativeSelectionAction): NativeSelectionSnapshot;
/** Minimal read boundary for the public ui-chat contract; no host UI imports. */
export interface NativeChat {
    readonly nodes: {
        get(key: string): unknown;
        source(key: string): {
            subscribe(listener: () => void): () => void;
        };
    };
}
export declare function readNativeChat(value: unknown): NativeChat | undefined;
export declare function isSelectableNativeNode(value: unknown): value is {
    key: string;
    kind: string;
};
/** A missing projection may be unloaded; a present ineligible node is authoritative. */
export declare function observeSelectedNativeNodes(chat: NativeChat, keys: ReadonlySet<string>, remove: (key: string) => void, fail: () => void): () => void;
export declare function nativeSelectionCopyText(chat: NativeChat, key: string): string;
/** Freeze the selected public projections; DOM order and selection order are not message order. */
export declare function nativeSelectionSnapshot(chat: NativeChat, sessionId: string, keys: ReadonlySet<string>): NativeChatSelectionSnapshot;
/** Only the visible user input is eligible. Non-text blocks stay explicit in the confirmation. */
export declare function nativeWorldPublishOrigin(chat: NativeChat, sessionId: string, key: string): import('../world-publish-source.js').WorldPublishOrigin;
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