import type { ImmutableArray } from "../util/array.js";
import type { Validator } from "../util/validate.js";
import type { SchemaOptions } from "./Schema.js";
import { Schema } from "./Schema.js";
/** Allowed options for `ArraySchema` */
export interface ArraySchemaOptions<T> extends SchemaOptions {
    readonly value?: ImmutableArray;
    readonly items: Validator<T>;
    readonly min?: number;
    readonly max?: number;
    readonly unique?: boolean;
}
/**
 * Define a valid array.
 *
 * Validates arrays and ensures the array's items match a specified format.
 * Only returns a new instance of the object if it changes (for immutability).
 *
 * Schema options:
 * - `value` The default value
 * - `length` The exact array length required
 * - `min` The minimum array length required
 * - `max` The maximum array length required
 * - `values` A schema all the array items in the value must conform to
 *
 * @example
 *  const schema = new ArraySchema({ min: 1, max: 2, default: [10,11,12], required: true });
 *  schema.validate([1,2,3], schema); // Returns [1,2,3]
 *  schema.validate(undefined, schema); // Returns [10,11,12] (due to value)
 *  schema.validate([4,5,6,7], schema); // Returns [4,5,6] (due to max)
 *  schema.validate(9999, schema); // Throws Invalid('Must be array')
 *  schema.validate([], schema); // Throws Required
 *  schema.validate([1,2], schema); // Throws Invalid('Needs at least 3 items')
 *
 * @example
 *  const schema = new ArraySchema({ schema: Array });
 *  schema.validate(["a", "a"], schema); // Returns ["a", "a"]
 *  schema.validate(["a", null], schema); // Throws Invalids({ "1": Invalid('Must be a string') });
 */
export declare class ArraySchema<T> extends Schema<ImmutableArray<T>> {
    readonly value: ImmutableArray;
    readonly items: Validator<T>;
    readonly unique: boolean;
    readonly min: number;
    readonly max: number;
    constructor({ items, unique, min, max, title, value, ...options }: ArraySchemaOptions<T>);
    validate(unsafeValue?: unknown): ImmutableArray<T>;
}
/** Valid array with specifed items. */
export declare const ARRAY: <T>(items: Validator<T>) => ArraySchema<T>;