export declare const is: {
    stringOrNumberOrBoolean: (val: unknown) => val is string | number | boolean;
    nullOrUndefined: (val: unknown) => val is null | undefined;
    undefined: (val: unknown) => val is undefined;
    string: (val: unknown) => val is string;
    boolean: (val: unknown) => val is boolean;
    number: (val: unknown) => val is number;
    object: (val: unknown) => val is Record<string, any>;
    array: (val: unknown) => val is any[];
};