import type { EditorState, Extension } from '@codemirror/state';
/**
 * Finds the opening lines of the blocks containing the cursors.
 * The content and gutter highlights share these offsets to stay aligned.
 *
 * @param state - The editor state.
 * @returns The sorted, unique start offsets of the active blocks.
 * @internal
 */
export declare function _activeLineStarts(state: EditorState): number[];
/**
 * Highlights the active line in the content and every gutter column, including
 * when the cursor is inside folded code.
 *
 * Replaces CodeMirror's separate active-line extensions, which can become
 * misaligned around folded code.
 *
 * @internal
 */
export declare const activeLineHighlight: Extension;
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