declare type BaseType = {
    new (...args: any[]): any;
} | true | "*";
interface TypeInfo {
    type?: TypeDescription;
    optional?: boolean;
    validate?: Function;
    shape?: Schema;
    element?: TypeDescription;
    values?: TypeDescription;
}
declare type ValueType = {
    value: any;
};
declare type TypeDescription = BaseType | TypeInfo | ValueType | TypeDescription[];
declare type SimplifiedSchema = string[];
declare type NormalizedSchema = {
    [key: string]: TypeDescription;
};
export declare type Schema = SimplifiedSchema | NormalizedSchema;
export declare function isOptional(t: TypeDescription): Boolean;
/**
 * Main validate function
 */
export declare function validate(obj: {
    [key: string]: any;
}, spec: Schema): void;
/**
 * Helper validate function, to get the list of errors. useful if one want to
 * manipulate the errors without parsing an error object
 */
export declare function validateSchema(obj: {
    [key: string]: any;
}, schema: Schema): string[];
export declare function validateType(key: string, value: any, descr: TypeDescription): string | null;
export {};