/**
 * Checks if a given value is a Markdoc content node.
 *
 * A valid content node must:
 * - Be a Markdoc `Node` (validated via `isNode`)
 * - Have a `type` property that belongs to one of the supported content node types:
 *   `'list' | 'text' | 'code' | 'blockquote' | 'paragraph' | 'table' | 'fence'`
 *
 * @param value - Any value to check.
 * @returns `true` if the value is a Markdoc content node, otherwise `false`.
 */
export declare function isContentNode(value?: any): value is Node & {
    type: 'list' | 'text' | 'code' | 'blockquote' | 'paragraph' | 'table' | 'fence';
};
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