import type { OpenChangeReason } from '../public-types.js';
import type { ResolvedLayout } from '../layout/types.js';
export type TransitionPhase = 'closed' | 'opening' | 'open' | 'dragging' | 'settling' | 'closing';
export interface SheetState {
    phase: TransitionPhase;
    open: boolean;
    activeSnapPoint: string | null;
    position: number;
    targetPosition: number;
    velocity: number;
    dismissReason: OpenChangeReason | null;
}
export type SheetEvent = {
    type: 'OPEN_REQUESTED';
    reason: OpenChangeReason;
    snapPoint: string;
    targetPosition: number;
} | {
    type: 'CLOSE_REQUESTED';
    reason: OpenChangeReason;
    velocity?: number;
} | {
    type: 'DRAG_STARTED';
    position: number;
} | {
    type: 'DRAG_MOVED';
    position: number;
} | {
    type: 'DRAG_ENDED';
    position: number;
    velocity: number;
    snapPoint: string;
    targetPosition: number;
} | {
    type: 'LAYOUT_CHANGED';
    layout: ResolvedLayout;
} | {
    type: 'SETTLED';
    position: number;
};
export interface ControllerDiagnostic {
    code: 'invalid-transition';
    event: SheetEvent['type'];
    phase: TransitionPhase;
}
export interface TransitionResult {
    state: SheetState;
    diagnostic: ControllerDiagnostic | null;
}
export interface SheetController {
    getState(): SheetState;
    dispatch(event: SheetEvent): void;
    subscribe(listener: (state: SheetState) => void): () => void;
}