import type { Variable } from '@markdoc/markdoc';
/**
 * Checks if a given value is a Markdoc `Variable` or `Node` of type `Variable`.
 *
 * A valid variable must:
 * - Be an object with a `$$mdtype` property
 * - Have `$$mdtype` equal to `'Variable'`
 *
 * @param value - Any value to check.
 * @returns `true` if the value is a Markdoc `Variable` or `Node` with type `'Variable'`, otherwise `false`.
 */
export declare function isVariable(value?: unknown): value is Variable | Node;
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