import { ValidationError } from '../validation-error';
export interface IAnySchema<T extends string = string> {
    readonly type: T;
    readonly rules: IAnySchemaRules;
    /**
     * Check if the value is not valid
     *
     * @param {unknown} value - the value to be validated
     *
     * @returns {string|null}
     * if there's an error, return a string message
     * if there's no error, return null
     */
    validate: (value: unknown) => ValidationError | null;
}
export interface IAnySchemaRules {
    readonly required?: boolean;
}
export declare abstract class BaseSchema {
    static SCHEMA_DESCRIPTOR: symbol;
    protected readonly descriptor: symbol;
}