/**
 * Internal helpers shared across concurrency implementations.
 *
 * @internal
 */
import { TaskWorkerError } from './errors';
import type { RpcWorkerModule, TaskWorkerErrorCode, WorkerModule, WorkerTaskHandler } from './types';
/**
 * Shared worker message protocol identifiers.
 *
 * These are duplicated verbatim inside the inline `Blob` worker scripts (which
 * must be fully self-contained strings); the constants keep the main-thread and
 * module-worker (`exposeTask` / `exposeRpc`) sides in sync with them.
 *
 * @internal
 */
export declare const WORKER_RUN_MESSAGE = "bq:run";
/** @internal */
export declare const WORKER_RPC_MESSAGE = "bq:rpc";
/** @internal */
export declare const WORKER_RESULT_MESSAGE = "bq:result";
/** @internal */
export declare const WORKER_ERROR_MESSAGE = "bq:error";
/** @internal */
export interface SerializedWorkerError {
    /** Untrusted serialized worker payload; validate against TaskWorkerErrorCode before use. */
    code?: string;
    message?: string;
    name?: string;
    stack?: string;
}
/** @internal */
export declare const isTaskWorkerErrorCode: (code: string | undefined) => code is TaskWorkerErrorCode;
/** @internal */
export declare const normalizeTimeout: (timeout?: number) => number | undefined;
/** @internal */
export declare const validateTaskHandler: <TInput, TResult>(handler: WorkerTaskHandler<TInput, TResult>) => string;
/** @internal */
export declare const createWorkerInstance: (scriptSource: string, name?: string) => Worker;
/** @internal Runtime brand marking a {@link WorkerModule} / {@link RpcWorkerModule}. */
export declare const WORKER_MODULE_BRAND: unique symbol;
/** @internal Detects a CSP-safe module descriptor produced by `defineWorker()`. */
export declare const isWorkerModuleDescriptor: (value: unknown) => value is WorkerModule<unknown, unknown> | RpcWorkerModule;
/** @internal Instantiates a CSP-safe module worker addressed by URL (no eval/blob). */
export declare const createModuleWorkerInstance: (module: WorkerModule<unknown, unknown> | RpcWorkerModule, name?: string) => Worker;
/** @internal */
export declare const restoreWorkerError: (payload: SerializedWorkerError | undefined) => TaskWorkerError;
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