/**
 * Get structured content nodes by group identifier.
 * Groups are JSON-encoded in the tag attribute as { "group": "value" }.
 * @category Helper
 * @param {string | string[]} groupOrGroups - Single group or array of groups to find
 * @param {import('prosemirror-state').EditorState} state - Editor state
 * @returns {Array<{ node: import('prosemirror-model').Node, pos: number }>} Matching structured content nodes
 * @example
 * // Find all fields with group "customer-info"
 * const fields = editor.helpers.getStructuredContentByGroup('customer-info', editor.state)
 *
 * // Find fields with multiple groups
 * const fields = editor.helpers.getStructuredContentByGroup(['customer-info', 'terms'], editor.state)
 */
export function getStructuredContentByGroup(groupOrGroups: string | string[], state: import('prosemirror-state').EditorState): Array<{
    node: import('prosemirror-model').Node;
    pos: number;
}>;
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