import type { Nullable } from './types.js';
export declare function toTitle(string: string): string;
export declare const urlSafeBase64: {
    isSafe: (input: string) => boolean;
    encode: (rawString: string) => string;
    decode: (encodedString: string) => string;
    replaceNonUrlSafeCharacters: (base64String: string) => string;
    restoreNonUrlSafeCharacters: (base64String: string) => string;
};
export declare const yes: (value?: Nullable<string>) => boolean;