/**
 * @param {Config} config
 *   Configuration (required).
 * @returns
 *   Plugin.
 */
export function createPlugin(config: Config): (options?: Readonly<Options> | null | undefined) => (tree: Root, file: VFile) => undefined;
export type Root = import('nlcst').Root;
export type Handler = import('nlcst-search').Handler;
export type VFile = import('vfile').VFile;
/**
 * Configuration.
 */
export type Config = {
    /**
     *   BCP-47 tag.
     */
    lang: string;
    /**
     *   Cuss.
     */
    cuss: Record<string, number>;
    /**
     * Pluralize instance.
     */
    pluralize?: Pluralize | undefined;
    /**
     * Phrases not to make plural/singular.
     */
    ignorePluralize?: ReadonlyArray<string> | undefined;
    /**
     * Phrases not to normalize.
     */
    regular?: ReadonlyArray<string> | undefined;
};
/**
 * Configuration (optional).
 */
export type Options = {
    /**
     * Phrases *not* to warn about (optional).
     */
    ignore?: ReadonlyArray<string> | null | undefined;
    /**
     * Minimum *sureness* to warn about, see `cuss` (default: `0`).
     */
    sureness?: 0 | 1 | 2 | null | undefined;
};
/**
 * Pluralize instance.
 */
export type Pluralize = {
    /**
     *   Transform to singular.
     */
    singular: Transform;
    /**
     *   Transform to plural.
     */
    plural: Transform;
};
/**
 * Transform a word.
 */
export type Transform = (word: string) => string;