export interface FogBounds {
    minX: number;
    minZ: number;
    maxX: number;
    maxZ: number;
}
export interface FogConfig {
    bounds: FogBounds;
    cellSize: number;
    /** Cells revealed on construction (start-of-run known area). */
    revealed?: readonly number[];
}
export interface FogCells {
    cols: number;
    rows: number;
    minX: number;
    minZ: number;
    cellSize: number;
    /** Row-major flags; index = row * cols + col. */
    revealed: readonly boolean[];
    revealedCount: number;
}
/**
 * Reveal-on-event fog of war over a fixed grid. Walking (`revealAlong`) and
 * digging/acting (`reveal`) clear cells; once revealed a cell stays revealed.
 * Pure and renderer-free — the shell/react map draws `cells()`.
 */
export interface FogField {
    reveal(x: number, z: number, radius?: number): number;
    revealAlong(from: readonly [number, number], to: readonly [number, number], radius?: number): number;
    isRevealed(x: number, z: number): boolean;
    isRevealedCell(col: number, row: number): boolean;
    revealedCount(): number;
    cellCount(): number;
    fraction(): number;
    cells(): FogCells;
    reset(): void;
    subscribe(listener: () => void): () => void;
}
export declare function createFogField(config: FogConfig): FogField;