/**
 * 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.
 */
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[];
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