import type { MsgHdrs } from "./core";
import { Match } from "./core";
export declare function canonicalMIMEHeaderKey(k: string): string;
export declare function headers(code?: number, description?: string): MsgHdrs;
export declare class MsgHdrsImpl implements MsgHdrs {
    _code: number;
    headers: Map<string, string[]>;
    _description: string;
    constructor(code?: number, description?: string);
    [Symbol.iterator](): IterableIterator<[string, string[]]>;
    size(): number;
    equals(mh: MsgHdrsImpl): boolean;
    static decode(a: Uint8Array): MsgHdrsImpl;
    toString(): string;
    encode(): Uint8Array;
    static validHeaderValue(k: string): string;
    keys(): string[];
    findKeys(k: string, match?: Match): string[];
    get(k: string, match?: "exact"): string;
    last(k: string, match?: "exact"): string;
    has(k: string, match?: Match): boolean;
    set(k: string, v: string, match?: Match): void;
    append(k: string, v: string, match?: Match): void;
    values(k: string, match?: Match): string[];
    delete(k: string, match?: Match): void;
    get hasError(): boolean;
    get status(): string;
    toRecord(): Record<string, string[]>;
    get code(): number;
    get description(): string;
    static fromRecord(r: Record<string, string[]>): MsgHdrs;
}