import { NodeDefinition, NodeLike, StatelessGraphNode, StatelessNodeDefinition, StatelessNodeType } from '../../types/graph';
/**
 * An instance of the [[fromBase64]] node.
 * See the [[fromBase64]] documentation to find out more.
 */
export interface FromBase64Node extends StatelessGraphNode<'from-base64', FromBase64NodeProperties> {
}
/**
 * A definition of the [[fromBase64]] node.
 * See the [[fromBase64]] documentation to find out more.
 */
export interface FromBase64NodeDefinition extends StatelessNodeDefinition<'from-base64', FromBase64NodeProperties> {
}
export interface FromBase64NodeProperties {
    subject: NodeDefinition;
}
/**
 * The implementation of the [[fromBase64]] node.
 * See the [[fromBase64]] documentation to learn more.
 */
export declare const FromBase64NodeType: StatelessNodeType<'from-base64', FromBase64NodeProperties>;
/**
 * Creates a new instance of a [[fromBase64]] node, which is used when converting a base64 encoded string back to a normal string.
 * The node expects the subject to be a [[value]] that contains a string value.
 *
 *
 * @example **Convert the string back from Base64**
 * ```js
 * import muster, { fromBase64 } from '@dws/muster';
 *
 * const app = muster({});
 *
 * await app.resolve(fromBase64('SGVsbG8gd29ybGQ='));
 * // === 'Hello world'
 * ```
 * This example shows how to convert a base 64 encoded string to a string.
 */
export declare function fromBase64(subject: NodeLike): FromBase64NodeDefinition;
export declare function isFromBase64NodeDefinition(value: NodeDefinition): value is FromBase64NodeDefinition;