/**
 * Custom fetch selector function.
 *
 * This module provides a function to select the appropriate custom fetch
 * implementation based on configuration. It evaluates various feature flags
 * and returns the corresponding custom fetch function, or undefined to use
 * the default fetch implementation.
 *
 * @module
 */
import type { Logger } from '../../logger/index.js';
import type { FetchProgressEvent } from '../types/progress-event.types.js';
/**
 * Configuration for custom fetch selection.
 */
export type CustomFetchConfig = {
    /**
     * Logger instance for custom fetch implementations.
     */
    readonly logger: Logger;
    /**
     * Whether to enable progress logging.
     */
    readonly enableProgressLog: boolean;
    /**
     * Base fetch function to wrap with progress tracking.
     * If not provided, uses global fetch.
     */
    readonly baseFetch?: typeof fetch;
    /**
     * Optional callback for progress events.
     */
    readonly onProgressEvent?: (event: FetchProgressEvent) => void;
};
/**
 * Select appropriate custom fetch function based on configuration.
 *
 * This function evaluates the provided configuration and returns the appropriate
 * custom fetch function. If no custom features are needed, it returns undefined
 * to allow the default fetch implementation to be used.
 *
 * @param config - Configuration for custom fetch selection
 * @returns Custom fetch function or undefined for default behavior
 *
 * @example
 * ```typescript
 * const customFetch = selectCustomFetch({
 *   logger: myLogger,
 *   enableProgressLog: true,
 * });
 *
 * const client = createProtoPediaClient({
 *   fetch: customFetch, // undefined uses default fetch
 * });
 * ```
 */
export declare function selectCustomFetch(config: CustomFetchConfig): typeof fetch | undefined;
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