export declare function promiseMaybeString(name: string, mixed: any): Promise<null | undefined | (string)>;
export declare function promiseMaybeMinLength(name: string, mixed: any, min: number): Promise<null | undefined | (string)>;
export declare function promiseMaybeMinLengthHandler(min: number): (name: string, mixed: any) => Promise<null | undefined | (string)>;
export declare function promiseMaybeMaxLength(name: string, mixed: any, max: number): Promise<null | undefined | (string)>;
export declare function promiseMaybeMaxLengthHandler(max: number): (name: string, mixed: any) => Promise<null | undefined | (string)>;
export declare function promiseMaybeLength(name: string, mixed: any, args: {
    min?: number;
    max?: number;
}): Promise<null | undefined | (string)>;
export declare function promiseMaybeLengthHandler(args: {
    min?: number;
    max?: number;
}): (name: string, mixed: any) => Promise<null | undefined | (string)>;
export declare function promiseMaybeNonEmpty(name: string, mixed: any): Promise<null | undefined | (string)>;
export declare function promiseMaybeContains(name: string, mixed: any, x: string): Promise<null | undefined | (string)>;
export declare function promiseMaybeContainsHandler(x: string): (name: string, mixed: any) => Promise<null | undefined | (string)>;
export declare function promiseMaybeNoDuplicate(name: string, mixed: any): Promise<null | undefined | (string)>;
export declare function promiseMaybeNotAllWhitespace(name: string, mixed: any): Promise<null | undefined | (string)>;
export declare function promiseMaybeNonEmptyAndNotAllWhitespace(name: string, mixed: any): Promise<null | undefined | (string)>;
export declare function promiseMaybeMatch(name: string, mixed: any, regex: RegExp): Promise<null | undefined | (string)>;
export declare function promiseMaybeMatchHandler(regex: RegExp): (name: string, mixed: any) => Promise<null | undefined | (string)>;
export declare function promiseMaybeEmail(name: string, mixed: any): Promise<null | undefined | (string)>;
export declare function promiseMaybeNotOneOf<T extends string>(name: string, mixed: any, arr: T[]): Promise<null | undefined | (string)>;
export declare function promiseMaybeNotOneOfHandler<T extends string>(arr: T[]): (name: string, mixed: any) => Promise<null | undefined | (string)>;
export declare function promiseMaybeBase64(name: string, mixed: any): Promise<null | undefined | (string)>;
export declare function promiseMaybeJson(name: string, mixed: any): Promise<null | undefined | (string)>;