import { EngineConfig, EngineFallbackInfo, WorkerCommunicationStrategy, WorkerPool } from '../../core/types';
/**
 * Engine flags bitmask (internal use).
 * @internal
 */
export declare enum EngineFlags {
    WORKER = 1,// 0b000001 = 1
    WASM = 2,// 0b000010 = 2
    STREAM_TRANSFER = 4,// 0b000100 = 4
    MESSAGE_STREAMING = 8,// 0b001000 = 8
    STRICT = 16
}
/**
 * Internal engine configuration manager.
 *
 * Manages engine configuration using bitmask for efficient flag operations.
 *
 * @internal
 */
export declare class InternalEngineConfig {
    private bitmask;
    readonly workerURL?: string | URL | undefined;
    readonly workerPool?: WorkerPool | undefined;
    readonly onFallback?: ((info: EngineFallbackInfo) => void) | undefined;
    constructor(config?: EngineConfig);
    /**
     * Private constructor for cloning.
     */
    private static fromBitmask;
    private parse;
    private applyDefaults;
    private validate;
    /**
     * Check if a flag is set.
     */
    private hasFlag;
    /**
     * Check if worker execution is enabled.
     */
    hasWorker(): boolean;
    /**
     * Check if WASM is enabled.
     */
    hasWasm(): boolean;
    /**
     * Check if stream transfer is enabled.
     */
    hasStreamTransfer(): boolean;
    /**
     * Check if message streaming is enabled.
     */
    hasMessageStreaming(): boolean;
    /**
     * Check if strict mode is enabled.
     */
    hasStrict(): boolean;
    /**
     * Get worker communication strategy.
     */
    getWorkerStrategy(): WorkerCommunicationStrategy | undefined;
    /**
     * Create a fallback configuration for worker.
     *
     * Converts stream-transfer to message-streaming and disables worker strict mode.
     */
    createWorkerFallbackConfig(): InternalEngineConfig;
    /**
     * Create a fallback configuration for WASM.
     *
     * Disables WASM.
     */
    createWasmFallbackConfig(): InternalEngineConfig;
    /**
     * Convert to EngineConfig.
     */
    toConfig(): EngineConfig;
    /**
     * Get bitmask for debugging.
     * @internal
     */
    getBitmask(): number;
    /**
     * String representation for debugging.
     */
    toString(): string;
}