import { ConfigurationError } from './configuration-error.js';
import { type ConfigSource } from '../spi/config-source.js';
/**
 * Error indicating that a configuration source has already been registered.
 */
export declare class DuplicateConfigSourceError extends ConfigurationError {
    /**
     * Creates a new instance of DuplicateConfigurationSourceError.
     *
     * @param source - The duplicate ConfigSource instance.
     * @param cause - The underlying cause of the error, if any.
     * @param meta - Additional metadata associated with the error.
     */
    constructor(source: ConfigSource, cause?: Error, meta?: object);
}