export declare const DEFAULT_GRACE_MS: number;
export type EndpointState = "active" | "reconnecting" | "closed";
export type TransitionEvent = {
    type: "register";
} | {
    type: "ipc_close";
    plugin_alive: boolean;
} | {
    type: "reattach";
} | {
    type: "grace_expired";
} | {
    type: "explicit_unregister";
};
export type TransitionEffect = {
    type: "start_grace_timer";
    deadline_ms: number;
} | {
    type: "cancel_grace_timer";
} | {
    type: "emit_state";
    state: EndpointState;
    reason: string;
} | {
    type: "drain_buffer";
} | {
    type: "remove_from_registry";
} | {
    type: "delete_buffer";
};
export interface TransitionResult {
    next: EndpointState;
    effects: readonly TransitionEffect[];
    ignored?: boolean;
}
export interface TransitionOptions {
    graceMs?: number;
}
export declare function transition(current: EndpointState, event: TransitionEvent, opts?: TransitionOptions): TransitionResult;
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