import { NodeDefinition, NodeLike, StatelessGraphNode, StatelessNodeDefinition, StatelessNodeType } from '../../types/graph';
/**
 * An instance of the [[toBase64]] node.
 * See the [[toBase64]] documentation to find out more.
 */
export interface ToBase64Node extends StatelessGraphNode<'to-base64', ToBase64NodeProperties> {
}
/**
 * A definition of the [[toBase64]] node.
 * See the [[toBase64]] documentation to find out more.
 */
export interface ToBase64NodeDefinition extends StatelessNodeDefinition<'to-base64', ToBase64NodeProperties> {
}
export interface ToBase64NodeProperties {
    subject: NodeDefinition;
}
/**
 * The implementation of the [[toBase64]] node.
 * See the [[toBase64]] documentation to learn more.
 */
export declare const ToBase64NodeType: StatelessNodeType<'to-base64', ToBase64NodeProperties>;
/**
 * Creates a new instance of a [[toBase64]] node, which is used when converting a string to a base64 encoded string
 * The node expects the subject to be a [[value]] that contains a string value.
 *
 *
 * @example **Convert the string to Base64**
 * ```js
 * import muster, { toBase64 } from '@dws/muster';
 *
 * const app = muster({});
 *
 * await app.resolve(toBase64('Hello world'));
 * // === 'SGVsbG8gd29ybGQ='
 * ```
 * This example shows how to convert a string to a base64 string.
 */
export declare function toBase64(subject: NodeLike): ToBase64NodeDefinition;
export declare function isToBase64NodeDefinition(value: NodeDefinition): value is ToBase64NodeDefinition;