import type { OriginOptionsInternal } from './http-client-types';
/**
 * Filter disallowed keys from a given custom request config object.
 * @param customRequestConfig - a given custom request config object to be filtered
 * @param disallowedKeys - A list of keys that are not allowed to be customized.
 * @returns Filtered custom request config object.
 * @internal
 */
export declare function filterCustomRequestConfig(customRequestConfig: Record<string, string>, disallowedKeys?: string[]): Record<string, string>;
/**
 * A list of request config keys that are not allowed to be customized by default.
 */
export declare const defaultDisallowedKeys: string[];
/**
 * Merge options from a given {@link OriginOptions}. When reaching conflicts, values with higher priorities are chosen.
 * @param headersOrParams - Given options with origin information.
 * @returns The resulting merged options.
 * @internal
 */
export declare function mergeOptionsWithPriority(headersOrParams?: OriginOptionsInternal): Record<string, string> | undefined;
/**
 * @internal
 * All origins ordered from low to high priority.
 */
export declare const origins: string[];