import type { AuthKitConfig } from './interfaces.js';
type ValueSource = Record<string, any> | ((key: string) => any);
/**
 * Configuration class for AuthKit.
 * This class is used to manage configuration values and provide defaults.
 * It also provides a way to get configuration values from environment variables.
 * @internal
 */
export declare class Configuration {
    private config;
    private valueSource;
    private readonly requiredKeys;
    /**
     * Convert a camelCase string to an uppercase, underscore-separated environment variable name.
     * @param str The string to convert
     * @returns The environment variable name
     */
    protected getEnvironmentVariableName(str: string): string;
    private updateConfig;
    setValueSource(source: ValueSource): void;
    configure(configOrSource: Partial<AuthKitConfig> | ValueSource, source?: ValueSource): void;
    getValue<K extends keyof AuthKitConfig>(key: K): AuthKitConfig[K];
}
/**
 * Configure AuthKit with a custom value source.
 * @param source The source of configuration values
 *
 * @example
 * configure(key => Deno.env.get(key));
 */
export declare function configure(source: ValueSource): void;
/**
 * Configure AuthKit with custom values.
 * @param config The configuration values
 *
 * @example
 * configure({
 *    clientId: 'your-client-id',
 *    redirectUri: 'https://your-app.com/auth/callback',
 *    apiKey: 'your-api-key',
 *    cookiePassword: 'your-cookie-password',
 *  });
 */
export declare function configure(config: Partial<AuthKitConfig>): void;
/**
 * Configure AuthKit with custom values and a custom value source.
 * @param config The configuration values
 * @param source The source of configuration values
 *
 * @example
 * configure({
 *   clientId: 'your-client-id',
 * }, env);
 */
export declare function configure(config: Partial<AuthKitConfig>, source: ValueSource): void;
/**
 * Get a configuration value by key.
 * This function will first check environment variables, then programmatically provided config,
 * and finally fall back to defaults for optional settings.
 * If a required setting is missing, an error will be thrown.
 * @param key The configuration key
 * @returns The configuration value
 */
export declare function getConfig<K extends keyof AuthKitConfig>(key: K): AuthKitConfig[K];
export {};