/**
 * Checks if a given value is a Markdoc text node.
 *
 * A valid text node must:
 * - Be a Markdoc `Node` (validated via `isNode`)
 * - Have the `type` property equal to `'text'`
 *
 * @param value - Any value to check.
 * @returns `true` if the value is a Markdoc node of type `'text'`, otherwise `false`.
 */
export declare function isTextNode(value?: unknown): value is Node & {
    type: 'text';
};
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