import { SymbolData } from '../config/types.js';
/**
 * Weighted random symbol selector using binary search on cumulative weights.
 *
 * Supports exclusion lists for symbols that shouldn't appear during
 * spinning or in buffer areas.
 */
export declare class RandomSymbolProvider {
    private _symbols;
    private _weights;
    private _cumulativeWeights;
    private _totalWeight;
    private _excludeSpinning;
    private _excludeBuffer;
    private _rng;
    /**
     * @param symbolsData - Symbol id → weight/data map.
     * @param rng - Source of randomness returning a value in [0, 1). Defaults to
     *   `Math.random`. Regulated / provably-fair deployments must inject a
     *   seeded, audited PRNG so the on-screen strip can be replayed from a seed.
     */
    constructor(symbolsData: Record<string, SymbolData>, rng?: () => number);
    /** Get a random symbol, optionally excluding buffer-only symbols. */
    next(useBufferExclusion?: boolean): string;
    /** Set symbols to exclude during spinning. */
    setExcludeSpinning(symbolIds: string[]): void;
    /** Set symbols to exclude from buffer (above/below) areas. */
    setExcludeBuffer(symbolIds: string[]): void;
    /** Update weights at runtime (e.g., for different game modes). */
    updateWeights(symbolsData: Record<string, SymbolData>): void;
    private _assertUsable;
    private _rebuildWeights;
    private _pickWeighted;
}
//# sourceMappingURL=RandomSymbolProvider.d.ts.map