export declare function requireProviderCredential(value: unknown, credentialName: string): string;
export declare function createRequestHeaders(options: {
    apiKeyHeaderName: string;
    apiKey: string;
    extraHeaders?: HeadersInit;
}): Headers;
export declare function createAnthropicRequestHeaders(options: {
    apiKey?: string;
    authToken?: string;
    extraHeaders?: HeadersInit;
    enableFineGrainedToolStreaming?: boolean;
    enableMcpConnector?: boolean;
}): Headers;
/** Create request init options for OpenAI-compatible providers. */
export declare function createOpenAIRequestInit(options: {
    apiKey: string;
    extraHeaders?: HeadersInit;
    body: string;
    signal?: AbortSignal;
}): RequestInit;
/** Create Anthropic request init. */
export declare function createAnthropicRequestInit(options: {
    apiKey?: string;
    authToken?: string;
    extraHeaders?: HeadersInit;
    enableFineGrainedToolStreaming?: boolean;
    enableMcpConnector?: boolean;
    body: string;
    signal?: AbortSignal;
}): RequestInit;
/** Create Google request init. */
export declare function createGoogleRequestInit(options: {
    apiKey: string;
    extraHeaders?: HeadersInit;
    body: string;
    signal?: AbortSignal;
}): RequestInit;
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