import type { SerializedStyles } from '@emotion/react';
/**
 * CSS custom property that controls the vertical margin between editor block elements
 *
 * Consumers can opt in to custom block spacing by setting this property on any ancestor of the
 * editor content (typically `:root` or the editor wrapper). When the property is unset, every block
 * margin rule falls back to its original token/value, so this is a no-op for all existing consumers.
 *
 * The editor only emits the `var(...)` block-margin rules when the
 * `platform_editor_extension_block_spacing` editor experiment is enabled, so the hook can be
 * disabled centrally and its SSR/layout performance impact can be tracked. Setting this property
 * has no effect while the experiment is off.
 */
export declare const EXTENSION_BLOCK_SPACING_VAR = "--ak-editor-extension-block-spacing";
export declare const wrapperDefault: SerializedStyles;
export declare const overlay: SerializedStyles;
export declare const placeholderFallback: SerializedStyles;
export declare const placeholderFallbackParams: SerializedStyles;
export declare const styledImage: SerializedStyles;
