/** Explicit enrollment, never inferred from equality of parent and child models. */
export interface ParentModelBinding {
    readonly childSessionId: string;
    readonly parentSessionId: string;
}
export interface FollowSelection {
    readonly provider: string;
    readonly model: string;
}
export interface FollowState {
    readonly inherited: number;
    readonly turn: number | null;
    readonly started: boolean;
    readonly explicit: FollowSelection | null;
    readonly descriptor: boolean;
    readonly blocked: boolean;
}
interface Event {
    readonly seq: number;
    readonly type: string;
    readonly data: unknown;
}
export declare const PARENT_MODEL_FOLLOW_PROJECTION = "githubCopilotParentModelFollow";
export declare function followSelection(value: unknown): FollowSelection | undefined;
export declare function initialFollowState(inherited?: number): FollowState;
/** Fold only the child's own suffix; copied fork selections are not child overrides. */
export declare function foldFollowState(state: FollowState, event: Event): FollowState;
export declare class ParentModelFollowError extends Error {
    readonly code: string;
    constructor(code: string);
}
export interface FollowSubject {
    readonly id: string;
    readonly parentId?: string;
    readonly origin?: string;
    readonly state: FollowState;
    readonly pending: FollowSelection | null;
    readonly recorded?: FollowSelection;
}
export declare function supportsParentFollowing(subject: FollowSubject): boolean;
/** Resolve a new turn's intent without changing any Session, setting or descriptor. */
export declare function resolveParentModel(child: FollowSubject, bindings: readonly ParentModelBinding[], lookup: (id: string) => FollowSubject | undefined, followAll?: boolean): FollowSelection | undefined;
export {};
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