export type StringFormatCheck = (value: string) => true | FormatIssue;
export interface FormatIssue {
    expectedFormat: string;
    [key: string]: unknown;
}
export declare const REGEX_ULID: RegExp;
export declare const REGEX_UUID: RegExp;
interface PasswordRequirements {
    minLength?: number;
    numberChars?: number;
    lowerCaseChars?: number;
    upperCaseChars?: number;
    specialChars?: number;
}
interface CheckEmailOptions {
    allowDisplayName?: boolean;
}
export declare namespace StringFormat {
    const email: (options?: CheckEmailOptions | undefined) => StringFormatCheck;
    const password: (requirements?: PasswordRequirements | undefined) => StringFormatCheck;
    const ULID: () => StringFormatCheck;
    const UUID: () => StringFormatCheck;
}
export {};