import { Compartment } from '@codemirror/state';
import { EditorView } from '@codemirror/view';
import { type RefObject } from 'react';
/**
 * Attribute used to expose the placeholder text on the content element so it can
 * be rendered through a CSS `::after` pseudo-element.
 */
export declare const placeholderDataAttribute = "data-placeholder";
/**
 * Attribute set on the scroll element while a placeholder is visible, used to
 * scope the styles that grow the line and gutter to fit it.
 */
export declare const placeholderReservedAttribute = "data-placeholder-reserved";
/**
 * Custom property carrying the measured placeholder height (in pixels). It is
 * set on the scroll element so both the content and the gutter can read it.
 */
export declare const placeholderHeightVariable = "--dt-editor-placeholder-height";
/**
 * Configures the placeholder functionality on the editor.
 * @param placeholderText - string to be used as placeholder text for editor
 * @param viewRef - Ref object for the editor
 * @param placeholderCompartment - compartment used to reconfigure the placeholder extension
 */
export declare const configurePlaceholder: (placeholderText: string | undefined, viewRef: RefObject<EditorView>, placeholderCompartment: Compartment) => void;
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