import { Extension } from '@tiptap/core';
import { PluginKey } from '@tiptap/pm/state';
import { DecorationSet } from '@tiptap/pm/view';
import { Rgba } from '@nextblock-cms/utils';
export interface LowContrastTextHintOptions {
    /** Set to `false` to disable the hint entirely without unregistering it. */
    enabled: boolean;
    /**
     * Documents larger than this (in ProseMirror content units) skip the walk.
     * The editor's own `CharacterCount` caps authored content at 50,000
     * characters, so this only ever fires for pathological pasted markup, where
     * freezing the tab would be far worse than losing the hint.
     */
    maxDocumentSize: number;
    /** Minimum contrast ratio for body copy. Large text is scaled from this. */
    threshold: number;
}
export declare const lowContrastTextHintKey: PluginKey<LowContrastPluginState>;
interface LowContrastPluginState {
    decorations: DecorationSet;
    /** The resolved editing surface the current `decorations` were measured against. */
    surface: Rgba | null;
}
export declare const LowContrastTextHint: Extension<LowContrastTextHintOptions, any>;
export default LowContrastTextHint;