import type { CanvasAction } from '../action-origin.generated.js';
import type { CanvasState } from './state.js';
/**
 * Pure reducer for canvas state.
 *
 * The channel currently has one full-replacement action. The `if` form keeps
 * unknown future actions forward-compatible because TypeScript cannot narrow a
 * single-variant action union to `never` for the usual exhaustiveness helper.
 */
export declare function canvasReducer(state: CanvasState, action: CanvasAction, log?: (msg: string) => void): CanvasState;
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