export declare function assertMaybeArray(name: string, mixed: any): (null | undefined | (any[])) | never;
export declare function assertMaybeMinLength(name: string, mixed: any, min: number): (null | undefined | (any[])) | never;
export declare function assertMaybeMinLengthHandler(min: number): (name: string, mixed: any) => (null | undefined | (any[])) | never;
export declare function assertMaybeMaxLength(name: string, mixed: any, max: number): (null | undefined | (any[])) | never;
export declare function assertMaybeMaxLengthHandler(max: number): (name: string, mixed: any) => (null | undefined | (any[])) | never;
export declare function assertMaybeLength(name: string, mixed: any, args: {
    min?: number;
    max?: number;
}): (null | undefined | (any[])) | never;
export declare function assertMaybeLengthHandler(args: {
    min?: number;
    max?: number;
}): (name: string, mixed: any) => (null | undefined | (any[])) | never;
export declare function assertMaybeNonEmpty(name: string, mixed: any): (null | undefined | (any[])) | never;
export declare function assertMaybeContains(name: string, mixed: any, x: any): (null | undefined | (any[])) | never;
export declare function assertMaybeContainsHandler(x: any): (name: string, mixed: any) => (null | undefined | (any[])) | never;
export declare function assertMaybeNoDuplicate(name: string, mixed: any): (null | undefined | (any[])) | never;