import type { Rec } from '../../index.js';
import { type RequestW } from '../../RequestW.js';
import { type ResponseW } from '../../ResponseW.js';
import type { WithNormalizedInputHeaders, WithNormalizedOutputHeaders } from './types.js';
export declare function fromExceptionList(s: string): string | undefined;
export declare function lowerCaseNormalizer(s: string): string;
export declare function canonicalNormalizer(s: string): string;
export declare function normalizeKeys(rec: Record<string, string | number | boolean | undefined> | undefined, normalizer: (s: string) => string): Record<string, string>;
export declare const transformInput: <I extends Rec>(normalizeRequestHeaders: boolean) => (i: RequestW<I>) => RequestW<I & WithNormalizedInputHeaders>;
export declare const transformOutput: <O extends Rec>(normalizeResponseHeaders: boolean) => (o: ResponseW<O>) => ResponseW<O & WithNormalizedOutputHeaders>;
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