/**
 * Utilities to encode client headers as WebSocket subprotocols (for proxy scenarios).
 * Format: [headerName1, encodeURIComponent(value1), headerName2, encodeURIComponent(value2), ...]
 */
import * as core from "../../core/index.js";
export type HeadersRecord = Record<string, string | core.Supplier<string | null | undefined> | null | undefined>;
/**
 * Resolves header values (including suppliers/functions) and returns a flat array
 * of [name, encodeURIComponent(value)] for each header, skipping undefined/empty values.
 * When filterSdkHeaders is true, SDK-added headers are excluded.
 */
export declare function buildProtocolsFromHeaders(headers: HeadersRecord | undefined, filterSdkHeaders?: boolean): Promise<string[]>;
/** Options shape for getWsProtocols (encodeHeadersAsWsProtocols + headers). */
export type WsProtocolsOptions = {
    encodeHeadersAsWsProtocols?: boolean;
    headers?: HeadersRecord;
};
/** Proxy protocols as array (pass-through) or object (encoded like headers). */
export type ProxyProtocolsInput = string[] | HeadersRecord;
export type ProxyOptions = {
    url: string;
    /** string[] passed as-is; Record → encoded as [name, encodeURIComponent(value), ...] pairs. */
    protocols?: ProxyProtocolsInput;
    queryParameters?: Record<string, string>;
};
/**
 * Returns WebSocket protocols array for connect (header-derived + proxy protocols).
 * proxyProtocols: array is passed as-is; object is encoded like headers.
 */
export declare function getWsProtocols(options: WsProtocolsOptions, proxyProtocols?: ProxyProtocolsInput): Promise<string[]>;