/**
 * @file chart.reducer.ts
 * @description
 * Core chart state management using the Composable Architecture pattern.
 * This reducer handles all chart state transitions including data updates,
 * selections, zoom/pan, and dimension changes.
 */
import type { Reducer } from '@composable-svelte/core';
import type { ChartState, ChartAction } from '../types/chart.types';
/**
 * @function chartReducer
 * @description
 * Pure reducer function that manages all chart state transitions.
 * Follows the (state, action, deps) => [newState, effect] pattern.
 *
 * **Supported Actions:**
 * - `setData` - Replace entire dataset
 * - `filterData` - Filter data by predicate
 * - `clearFilters` - Reset to original dataset
 * - `selectPoint` - Select single data point
 * - `selectRange` - Select range of indices
 * - `brushStart/Move/End` - Brush selection workflow
 * - `clearSelection` - Clear all selections
 * - `zoom` - Update zoom transform
 * - `zoomAnimated` - Initiate animated zoom
 * - `zoomProgress` - Update transform during animation
 * - `zoomComplete` - Complete animation
 * - `resetZoom` - Reset to identity transform
 * - `resize` - Update chart dimensions
 * - `updateSpec` - Update Observable Plot specification
 *
 * @example
 * ```typescript
 * import { createStore } from '@composable-svelte/core';
 * import { chartReducer, createInitialChartState } from '@composable-svelte/charts';
 *
 * const store = createStore({
 *   initialState: createInitialChartState({ data: myData }),
 *   reducer: chartReducer,
 *   dependencies: {}
 * });
 *
 * // Dispatch actions
 * store.dispatch({ type: 'filterData', predicate: d => d.value > 100 });
 * store.dispatch({ type: 'zoom', transform: { x: 0, y: 0, k: 2 } });
 * ```
 *
 * @param {ChartState} state - Current chart state
 * @param {ChartAction} action - Action to process
 * @param {{}} _deps - Dependencies (unused)
 * @returns {[ChartState, Effect<ChartAction>]} Tuple of new state and effect
 *
 * @see {@link ChartState} for state structure
 * @see {@link ChartAction} for action types
 * @see {@link createInitialChartState} for state initialization
 */
export declare const chartReducer: Reducer<ChartState, ChartAction, {}>;
/**
 * @function createInitialChartState
 * @description
 * Factory function that creates the initial state for a chart store.
 * Provides sensible defaults for all state fields while allowing
 * customization via the config parameter.
 *
 * **Default Values:**
 * - `data`: Empty array
 * - `filteredData`: Same as data
 * - `dimensions`: 600x400px
 * - `selection`: No selection (type: 'none')
 * - `transform`: Identity transform {x: 0, y: 0, k: 1}
 * - `isAnimating`: false
 * - `transitionDuration`: 0.3s
 * - `spec`: Empty object (Observable Plot will use defaults)
 *
 * @example
 * ```typescript
 * import { createInitialChartState } from '@composable-svelte/charts';
 *
 * // With data
 * const state = createInitialChartState({
 *   data: [{ x: 1, y: 10 }, { x: 2, y: 20 }]
 * });
 *
 * // With custom dimensions
 * const state = createInitialChartState({
 *   data: myData,
 *   dimensions: { width: 800, height: 600 }
 * });
 *
 * // With Observable Plot spec customization
 * const state = createInitialChartState({
 *   data: myData,
 *   spec: {
 *     marginLeft: 60,
 *     marginBottom: 40,
 *     grid: true
 *   }
 * });
 * ```
 *
 * @template T - Type of data items in the dataset
 * @param {Object} config - Configuration object
 * @param {T[]} [config.data=[]] - Initial dataset
 * @param {Partial<ChartState['spec']>} [config.spec={}] - Observable Plot specification overrides
 * @param {{width: number, height: number}} [config.dimensions] - Chart dimensions (default: 600x400)
 * @returns {ChartState<T>} Initial chart state
 *
 * @see {@link ChartState} for full state structure
 * @see {@link chartReducer} for state transitions
 */
export declare function createInitialChartState<T = unknown>(config: {
    data?: T[];
    spec?: Partial<ChartState['spec']>;
    dimensions?: {
        width: number;
        height: number;
    };
}): ChartState<T>;
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