import { type ComponentDef } from '@defra/forms-model';
import { type JoiExpression, type ReferenceOptions } from 'joi';
/**
 * Prevent Markdown formatting
 * @see {@link https://pandoc.org/chunkedhtml-demo/8.11-backslash-escapes.html}
 */
export declare function escapeMarkdown(answer: string): string;
export declare const addClassOptionIfNone: (options: Extract<ComponentDef, {
    options: {
        classes?: string;
    };
}>["options"], className: string) => void;
/**
 * Applies lowerFirst but preserves capitalisation of proper nouns
 * like "National Grid", "Ordnance Survey" and "OS".
 */
export declare function lowerFirstPreserveProperNouns(text: string): string;
/**
 * Configuration for Joi expressions that use lowerFirst function
 */
export declare const lowerFirstExpressionOptions: ReferenceOptions;
/**
 * Creates a Joi expression with lowerFirst function support
 * Used for error messages in location field components
 */
export declare const createLowerFirstExpression: (template: string) => JoiExpression;