/**
 * THIS FILE IS MANUALLY MAINTAINED: see .fernignore
 *
 * Custom HeaderAuthProvider that supports both apiKey and accessToken authentication.
 * When accessToken is provided to HumeClient, the wrapper converts it to an
 * Authorization: Bearer header. This provider checks for both apiKey and the
 * Authorization header to support both auth methods.
 */
import * as core from "../core/index.js";
export declare namespace HeaderAuthProvider {
    type AuthOptions = {
        apiKey?: core.Supplier<string | undefined>;
    };
    type Options = {
        headers?: Record<string, string | core.Supplier<string | null | undefined> | null | undefined>;
    } & AuthOptions;
}
export declare class HeaderAuthProvider implements core.AuthProvider {
    private readonly options;
    constructor(options: HeaderAuthProvider.Options);
    static canCreate(options: HeaderAuthProvider.Options): boolean;
    private static hasAuthorizationHeader;
    getAuthRequest(_arg?: {
        endpointMetadata?: core.EndpointMetadata;
    }): Promise<core.AuthRequest>;
}